# 16 Del. Admin. Code § 4462: 16 DE Admin. Code 4462. Public Drinking Water Systems

> Delaware · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/STATE_DE_ADC_T16_4462

## Section

- **Citation:** 16 Del. Admin. Code § 4462
- **Heading:** 16 DE Admin. Code 4462. Public Drinking Water Systems
- **Jurisdiction:** Delaware
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Delaware Administrative Code / Title 16 Health and Safety / Department of Health and Social Services / 4000 Division of Public Health / 4400 Health Systems Protection (HSP) / 16 DE Admin. Code 4462

## Text

Residual | Methodology | Methods
Free Chlorine | Amperometric Titration | 4500-Cl D
DPD Ferrous Titrimetric | 4500-Cl F
DPD Colorimetric | 4500-Cl G
Syringaldazine (FACTS) | 4500-Cl H
Total Chlorine | Amperometric Titration | 4500-Cl D
Amperometric Titration (low level measurement) | 4500-Cl E
DPD Ferrous Titrimetric | 4500-Cl F
DPD Colorimetric | 4500-Cl G
Iodometric | 4500-Cl I
Chlorine Dioxide | Amperometric Titration | 4500-ClO 2 C
DPD Method | 4500-ClO 2 D
Amperometric Titration | 4500-ClO 2 E
Ozone | Indigo Method | 4500-O 3 B
Disinfectant residual | MRDL (mg/L)
Chlorine | 4.0 (as Cl 2 )
Chloramines | 4.0 (as Cl 2 )
Chlorine Dioxide | 0.8 (as ClO 2 )
“ Technical capacity ” means the physical infrastructure of water system, including but not limited to, the adequacy of the source water, infrastructure (source, treatment, storage, and distribution), and the ability of system personnel to implement the requisite technical knowledge.
“ Managerial capacity ” means the management structure of the water system, including but not limited to ownership accountability, staffing and organization, and effective linkages.
“ Financial capacity ” means the financial resources of the water system, including but not limited to revenue sufficiency and fiscal controls.
Loss of pressure
Well pump failure
Main break with associated loss of pressure
Loss of disinfectant or other treatment failure
Acts of vandalism
Discovery of malicious intent
Antimony: Some people who drink water containing antimony well in excess of the MCL over many years could experience increases in blood cholesterol and decreases in blood sugar.
Arsenic: Some people who drink water containing arsenic in excess of the MCL over many years could experience skin damage or problems with their circulatory system, and may have an increased risk of getting cancer.
Asbestos: Some people who drink water containing asbestos in excess of the MCL over many years may have an increased risk of developing benign intestinal polyps
ecreases in blood sugar.
Arsenic: Some people who drink water containing arsenic in excess of the MCL over many years could experience skin damage or problems with their circulatory system, and may have an increased risk of getting cancer.
Asbestos: Some people who drink water containing asbestos in excess of the MCL over many years may have an increased risk of developing benign intestinal polyps.
Barium: Some people who drink water containing barium in excess of the MCL over many years could experience an increase in their blood pressure.
Beryllium: Some people who drink water containing beryllium well in excess of the MCL over many years could develop intestinal lesions.
Cadmium: Some people who drink water containing cadmium in excess of the MCL over many years could experience kidney damage.
Chromium: Some people who use water containing chromium well in excess of the MCL over many years could experience allergic dermatitis.
Copper: Copper is an essential nutrient, but some people who drink water containing copper in excess of the action level over a relatively short amount of time could experience gastrointestinal distress. Some people who drink water containing copper in excess of the action level over many years could suffer liver or kidney damage. People with Wilson's Disease should consult their personal doctor.
Cyanide: Some people who drink water containing cyanide well in excess of the MCL over many years could experience nerve damage or problems with their thyroid.
Lead: Infants and children who drink water containing lead in excess of the action level could experience delays in their physical or mental development. Children could show slight deficits in attention span and learning abilities. Adults who drink this water over many years could develop kidney problems or high blood pressure.
Mercury (inorganic): Some people who drink water containing inorganic mercury well in excess of the MCL over many years could experience kidney damage
on level could experience delays in their physical or mental development. Children could show slight deficits in attention span and learning abilities. Adults who drink this water over many years could develop kidney problems or high blood pressure.
Mercury (inorganic): Some people who drink water containing inorganic mercury well in excess of the MCL over many years could experience kidney damage.
Nickel: Some people who drink water containing nickel well in excess of the MCL over many years could experience heart and liver damage.
Nitrate: Infants below the age of six months who drink water containing nitrate in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome.
Nitrite: Infants below the age of six months who drink water containing nitrite in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue-baby syndrome.
Selenium: Selenium is an essential nutrient. However, some people who drink water containing selenium in excess of the MCL over many years could experience hair or fingernail losses, numbness in fingers or toes, or problems with their circulation.
Thallium: Some people who drink water containing thallium in excess of the MCL over many years could experience hair loss, changes in their blood, or problems with their kidneys, intestines, or liver.
2,4-D: Some people who drink water containing the weed killer 2,4-D well in excess of the MCL over many years could experience problems with their kidneys, liver, or adrenal glands.
2,4,5-TP [Silvex]: Some people who drink water containing silvex in excess of the MCL over many years could experience liver problems.
Acrylamide: Some people who drink water containing high levels of acrylamide over a long period of time could have problems with their nervous system or blood, and may have an increased risk of getting cancer
e problems with their kidneys, liver, or adrenal glands.
2,4,5-TP [Silvex]: Some people who drink water containing silvex in excess of the MCL over many years could experience liver problems.
Acrylamide: Some people who drink water containing high levels of acrylamide over a long period of time could have problems with their nervous system or blood, and may have an increased risk of getting cancer.
Alachlor: Some people who drink water containing alachlor in excess of the MCL over many years could have problems with their eyes, liver, kidneys, or spleen, or experience anemia, and may have an increased risk of getting cancer.
Atrazine. Some people who drink water containing atrazine well in excess of the MCL over many years could experience problems with their cardiovascular system or reproductive difficulties.
Benzo(a)pyrene (PAH). Some people who drink water containing benzo(a)pyrene in excess of the MCL over many years may experience reproductive difficulties and may have an increased risk of getting cancer.
Carbofuran: Some people who drink water containing carbofuran in excess of the MCL over many years could experience problems with their blood, or nervous or reproductive systems.
Chlordane: Some people who drink water containing chlordane in excess of the MCL over many years could experience problems with their liver or nervous system, and may have an increased risk of getting cancer.
Dalapon: Some people who drink water containing dalapon well in excess of the MCL over many years could experience minor kidney changes.
Di(2-ethylhexyl)adipate: Some people who drink water containing di (2-ethylhexyl) adipate well in excess of the MCL over many years could experience general toxic effects or reproductive difficulties.
Di(2-ethylhexyl)phthalate: Some people who drink water containing di (2-ethylhexyl) phthalate in excess of the MCL over many years may have problems with their liver, or experience reproductive difficulties, and may have an increased risk of getting cancer
aining di (2-ethylhexyl) adipate well in excess of the MCL over many years could experience general toxic effects or reproductive difficulties.
Di(2-ethylhexyl)phthalate: Some people who drink water containing di (2-ethylhexyl) phthalate in excess of the MCL over many years may have problems with their liver, or experience reproductive difficulties, and may have an increased risk of getting cancer.
Dibromochloropropane (DBCP): Some people who drink water containing DBCP in excess of the MCL over many years could experience reproductive difficulties and may have an increased risk of getting cancer.
Dinoseb: Some people who drink water containing dinoseb well in excess of the MCL over many years could experience reproductive difficulties.
Diquat: Some people who drink water containing diquat in excess of the MCL over many years could get cataracts.
Dioxin (2,3,7,8-TCDD ): Some people who drink water containing dioxin in excess of the MCL over many years could experience reproductive difficulties and may have an increased risk of getting cancer.
Endothall: Some people who drink water containing endothall in excess of the MCL over many years could experience problems with their stomach or intestines.
Endrin: Some people who drink water containing endrin in excess of the MCL over many years could experience liver problems.
Epichlorohydrin: Some people who drink water containing high levels of epichlorohydrin over a long period of time could experience stomach problems, and may have an increased risk of getting cancer.
Ethylene dibromide (EDB): Some people who drink water containing ethylene dibromide in excess of the MCL over many years could experience problems with their liver, stomach, reproductive system, or kidneys, and may have an increased risk of getting cancer.
Glyphosate: Some people who drink water containing glyphosate in excess of the MCL over many years could experience problems with their kidneys or reproductive difficulties
e people who drink water containing ethylene dibromide in excess of the MCL over many years could experience problems with their liver, stomach, reproductive system, or kidneys, and may have an increased risk of getting cancer.
Glyphosate: Some people who drink water containing glyphosate in excess of the MCL over many years could experience problems with their kidneys or reproductive difficulties.
Heptachlor: Some people who drink water containing heptachlor in excess of the MCL over many years could experience liver damage and may have an increased risk of getting cancer.
Heptachlor Epoxide: Some people who drink water containing heptachlor epoxide in excess of the MCL over many years could experience liver damage, and may have an increased risk of getting cancer.
Hexachlorobenzene: Some people who drink water containing hexachlorobenzene in excess of the MCL over many years could experience problems with their liver or kidneys, or adverse reproductive effects, and may have an increased risk of getting cancer.
Hexachlorocyclopentadiene: Some people who drink water containing hexachlorocyclopentadiene well in excess of the MCL over many years could experience problems with their kidneys or stomach.
Lindane: Some people who drink water containing lindane in excess of the MCL over many years could experience problems with their kidneys or liver.
Methoxychlor: Some people who drink water containing methoxychlor in excess of the MCL over many years could experience reproductive difficulties.
Oxamyl [Vydate]: Some people who drink water containing oxamyl in excess of the MCL over many years could experience slight nervous system effects.
PCBs [Polychlorinated Biphenyls]: Some people who drink water containing PCBs in excess of the MCL over many years could experience changes in their skin, problems with their thymus gland, immune deficiencies, or reproductive or nervous system difficulties, and may have an increased risk of getting cancer
g oxamyl in excess of the MCL over many years could experience slight nervous system effects.
PCBs [Polychlorinated Biphenyls]: Some people who drink water containing PCBs in excess of the MCL over many years could experience changes in their skin, problems with their thymus gland, immune deficiencies, or reproductive or nervous system difficulties, and may have an increased risk of getting cancer.
Pentachlorophenol: Some people who drink water containing pentachlorophenol in excess of the MCL over many years could experience problems with their liver or kidneys, and may have an increased risk of getting cancer.
Picloram: Some people who drink water containing picloram in excess of the MCL over many years could experience problems with their liver.
Simazine: Some people who drink water containing simazine in excess of the MCL over many years could experience problems with their blood.
Toxaphene: Some people who drink water containing toxaphene in excess of the MCL over many years could have problems with their kidneys, liver, or thyroid, and may have an increased risk of getting cancer.
Benzene: Some people who drink water containing benzene in excess of the MCL over many years could experience anemia or a decrease in blood platelets, and may have an increased risk of getting cancer.
Carbon Tetrachloride: Some people who drink water containing carbon tetrachloride in excess of the MCL over many years could experience problems with their liver and may have an increased risk of getting cancer.
Chlorobenzene [Monochlorobenzene]: Some people who drink water containing chlorobenzene in excess of the MCL over many years could experience problems with their liver or kidneys.
o-Dichlorobenzene: Some people who drink water containing o-dichlorobenzene well in excess of the MCL over many years could experience problems with their liver, kidneys, or circulatory systems
ed risk of getting cancer.
Chlorobenzene [Monochlorobenzene]: Some people who drink water containing chlorobenzene in excess of the MCL over many years could experience problems with their liver or kidneys.
o-Dichlorobenzene: Some people who drink water containing o-dichlorobenzene well in excess of the MCL over many years could experience problems with their liver, kidneys, or circulatory systems.
p-Dichlorobenzene: Some people who drink water containing p-dichlorobenzene in excess of the MCL over many years could experience anemia, damage to their liver, kidneys, or spleen, or changes in their blood.
1,2-Dichloroethane: Some people who drink water containing 1,2-dichloroethane in excess of the MCL over many years may have an increased risk of getting cancer.
1,1-Dichloroethylene:Some people who drink water containing 1,1-dichloroethylene in excess of the MCL over many years could experience problems with their liver.
Cis-1,2-Dichloroethylene: Some people who drink water containing cis-1,2-dichloroethylene in excess of the MCL over many years could experience problems with their liver.
Trans-1,2-Dichloroethylene: Some people who drink water containing trans-1,2-dichloroethylene well in excess of the MCL over many years could experience problems with their liver.
Dichloromethane: Some people who drink water containing dichloromethane in excess of the MCL over many years could have liver problems and may have an increased risk of getting cancer.
1,2-Dichloropropane: Some people who drink water containing 1,2-dichloropropane in excess of the MCL over many years may have an increased risk of getting cancer.
Ethylbenzene: Some people who drink water containing ethylbenzene well in excess of the MCL over many years could experience problems with their liver or kidneys
could have liver problems and may have an increased risk of getting cancer.
1,2-Dichloropropane: Some people who drink water containing 1,2-dichloropropane in excess of the MCL over many years may have an increased risk of getting cancer.
Ethylbenzene: Some people who drink water containing ethylbenzene well in excess of the MCL over many years could experience problems with their liver or kidneys.
Methyl [tert] Butyl Ether (MTBE): Some people who drink water containing MTBE in excess of the MCL over many years may experience problems of the central nervous system, including loss of muscle coordination, tremors, difficulty breathing, and drowsiness.
Styrene: Some people who drink water containing styrene well in excess of the MCL over many years could have problems with their liver, kidneys, or circulatory system.
Tetrachloroethylene: Some people who drink water containing tetrachloroethylene in excess of the MCL over many years could have problems with their liver, and may have an increased risk of getting cancer.
1,2,4-Trichlorobenzene: Some people who drink water containing 1,2,4-trichlorobenzene well in excess of the MCL over many years could experience changes in their adrenal glands.
1,1,1-Trichloroethane: Some people who drink water containing 1,1,1-trichloroethane in excess of the MCL over many years could experience problems with their liver, nervous system, or circulatory system.
1,1,2-Trichloroethane: Some people who drink water containing 1,1,2-trichloroethane well in excess of the MCL over many years could have problems with their liver, kidneys, or immune systems.
Trichloroethylene: Some people who drink water containing trichloroethylene in excess of the MCL over many years could experience problems with their liver and may have an increased risk of getting cancer.
Toluene: Some people who drink water containing toluene well in excess of the MCL over many years could have problems with their nervous system, kidneys, or liver
er, kidneys, or immune systems.
Trichloroethylene: Some people who drink water containing trichloroethylene in excess of the MCL over many years could experience problems with their liver and may have an increased risk of getting cancer.
Toluene: Some people who drink water containing toluene well in excess of the MCL over many years could have problems with their nervous system, kidneys, or liver.
Vinyl Chloride: Some people who drink water containing vinyl chloride in excess of the MCL over many years may have an increased risk of getting cancer.
Xylenes: Some people who drink water containing xylenes in excess of the MCL over many years could experience damage to their nervous system.
Beta/photon emitters: Certain minerals are radioactive and may emit forms of radiation known as photons and beta radiation. Some people who drink water containing beta and photon emitters in excess of the MCL over many years may have an increased risk of getting cancer.
Alpha emitters: Certain minerals are radioactive and may emit a form of radiation known as alpha radiation. Some people who drink water containing alpha emitters in excess of the MCL over many years may have an increased risk of getting cancer.
Combined Radium 226/228: Some people who drink water containing radium 226 or 228 in excess of the MCL over many years may have an increased risk of getting cancer.
Uranium: Some people who drink water containing uranium in excess of the MCL over many years may have an increased risk of getting cancer and kidney toxicity.
Chlorine: Some people who use water containing chlorine well in excess of the MRDL could experience irritating effects to their eyes and nose. Some people who drink water containing chlorine well in excess of the MRDL could experience stomach discomfort.
Chloramines: Some people who use water containing chloramines well in excess of the MRDL could experience irritating effects to their eyes and nose
lorine: Some people who use water containing chlorine well in excess of the MRDL could experience irritating effects to their eyes and nose. Some people who drink water containing chlorine well in excess of the MRDL could experience stomach discomfort.
Chloramines: Some people who use water containing chloramines well in excess of the MRDL could experience irritating effects to their eyes and nose. Some people who drink water containing chloramines well in excess of the MRDL could experience stomach discomfort or anemia.
Chlorine dioxide, where any two consecutive daily samples taken at the entrance to the distribution system are above the MRDL: Some infants and young children who drink water containing chlorine dioxide in excess of the MRDL could experience nervous system effects. Similar effects may occur in fetuses of pregnant women who drink water containing chlorine dioxide in excess of the MRDL. Some people may experience anemia.
Add for public notification only: The chlorine dioxide violations reported today are the result of exceedances at the treatment facility only, not within the distribution system which delivers water to consumers. Continued compliance with chlorine dioxide levels within the distribution system minimizes the potential risk of these violations to consumers.
Chlorine dioxide, where one or more distribution system samples are above the MRDL: Some infants and young children who drink water containing chlorine dioxide in excess of the MRDL could experience nervous system effects. Similar effects may occur in fetuses of pregnant women who drink water containing chlorine dioxide in excess of the MRDL. Some people may experience anemia.
Add for public notification only: The chlorine dioxide violations reported today include exceedances of the EPA standard within the distribution system which delivers water to consumers. Violations of the chlorine dioxide standard within the distribution system may harm human health based on short-term exposures
containing chlorine dioxide in excess of the MRDL. Some people may experience anemia.
Add for public notification only: The chlorine dioxide violations reported today include exceedances of the EPA standard within the distribution system which delivers water to consumers. Violations of the chlorine dioxide standard within the distribution system may harm human health based on short-term exposures. Certain groups, including fetuses, infants, and young children, may be especially susceptible to nervous system effects from excessive exposure to chlorine dioxide-treated water.
Disinfection byproducts and treatment technique for DBPs: The United States Environmental Protection Agency (EPA) sets drinking water standards and requires the disinfection of drinking water. However, when used in the treatment of drinking water, disinfectants react with naturally-occurring organic and inorganic matter present in water to form chemicals called disinfection byproducts (DBPs). EPA has determined that a number of DBPs are a health concern at certain levels of exposure. Certain DBPs, including some trihalomethanes (THMs) and some haloacetic acids (HAAs), have been shown to cause cancer in laboratory animals. Other DBPs have been shown to affect the liver and the nervous system, and cause reproductive or developmental effects in laboratory animals. Exposure to certain DBPs may produce similar effects in people. EPA has set standards to limit exposure to THMs, HAAs, and other DBPs.
Bromate: Some people who drink water containing bromate in excess of the MCL over many years may have an increased risk of getting cancer.
Chlorite: Some infants and young children who drink water containing chlorite in excess of the MCL could experience nervous system effects. Similar effects may occur in fetuses of pregnant women who drink water containing chlorite in excess of the MCL. Some people may experience anemia
drink water containing bromate in excess of the MCL over many years may have an increased risk of getting cancer.
Chlorite: Some infants and young children who drink water containing chlorite in excess of the MCL could experience nervous system effects. Similar effects may occur in fetuses of pregnant women who drink water containing chlorite in excess of the MCL. Some people may experience anemia.
Haloacetic Acids (HAA): Some people who drink water containing haloacetic acids in excess of the MCL over many years may have an increased risk of getting cancer.
TTHMs [Total Trihalomethanes]: Some people who drink water containing trihalomethanes in excess of the MCL over many years may experience problems with their liver, kidneys, or central nervous systems, and may have an increased risk of getting cancer.
Contaminant | MCL/MRDL/TT violations 2 | Monitoring and Testing Procedure violations
Tier of Public Notice Required | Citation | Tier of Public Notice Required | Citation
1. Violations of National Primary Drinking Water Regulations (NPDWR) 3
A. Microbiological Contaminants
1.a. Total coliform bacteria † | 2 | 7.0 | 3 | 7.0
1.b Total coliform (TT violations resulting from failure to perform assessments or corrective actions, monitoring violations, and reporting violations) ‡ | 2 | 7.4.10.2.1 | 3 | 7.4.10.3.1
1.c Seasonal system failure to follow Division-approved start-up plan prior to serving water to the public or failure to provide certification to the Division ‡ | 2 | 7.4.4.10.2.2 | 3 | 7.4.10.4.3
2.a Fecal coliform/ E. coli † | 1 | 7.0 | 4 1,3 | 7.0
2.b E. coli (MCL, monitoring, and reporting violations) ‡ | 1 | 7.4.10.1 | 3 | 7.4.10.3.2 7.4.10.4.1 7.4.10.4.2
2.c E. coli (TT violations resulting from failure to perform Level 2 Assessments or corrective action) ‡ | 2 | 7.4.10.2.1
3. Turbidity MCL | 2 | 16.4 | 3 | 16.5
4. Turbidity MCL (average of 2 days samples >5 NTU) | 5 2,1 | 16.4 | 3 | 16.5
5
cal coliform/ E. coli † | 1 | 7.0 | 4 1,3 | 7.0
2.b E. coli (MCL, monitoring, and reporting violations) ‡ | 1 | 7.4.10.1 | 3 | 7.4.10.3.2 7.4.10.4.1 7.4.10.4.2
2.c E. coli (TT violations resulting from failure to perform Level 2 Assessments or corrective action) ‡ | 2 | 7.4.10.2.1
3. Turbidity MCL | 2 | 16.4 | 3 | 16.5
4. Turbidity MCL (average of 2 days samples >5 NTU) | 5 2,1 | 16.4 | 3 | 16.5
5. Turbidity (for TT violations resulting from a single exceedance of maximum allowable turbidity level) | 6 2,1 | 16.4 | 3 | 16.5
6. Surface Water Treatment rule violations, other than violations resulting from single exceedance of max. allowable turbidity level (TT) | 2 | 16.0 | 3 | 16.0
7. Interim Enhanced Surface Water Treatment Rule violations, other than violations resulting from single exceedance of max. allowable turbidity level (TT) | 7 2 | 17.0 | 3 | 17.0
8. Filter Backwash Recycling Rule violations. | 2 | 18.0 | 3 | 18.0
9. Long Term 1 Enhanced Surface Water Treatment Rule violations] | 2 | 19.0 | 3 | 19.0
10. Long Term 2 Enhanced Surface water Treatment Rule violations | 2 | 20.0 | 22 2,3 | 20.2-20.6 and 20.9-20.10
11.Ground Water Rule Violations | 2 | 8.0 | 3 | 8.4.2
B. Inorganic Chemicals (IOCs)
1. Antimony | 2 | 9.1 | 3 | 9.1.2
2. Arsenic | 2 | 8 9.1 | 3 | 11 9.1.2
3. Asbestos(fibers >10 microns) | 2 | 9.1 | 3 | 9.1.2
4. Barium | 2 | 9.1 | 3 | 9.1.2
5. Beryllium | 2 | 9.1 | 3 | 9.1.2
6. Cadmium | 2 | 9.1 | 3 | 9.1.2
7. Chromium (Total) | 2 | 9.1 | 3 | 9.1.2
8. Cyanide | 2 | 9.1 | 3 | 9.1.2
9. Fluoride | 1,2 | 9.1 | 3 | 9.1.2
10. Mercury (inorganic) | 2 | 9.1 | 3 | 9.1.2
11. Nickel | 2 | 9.1 | 3 | 9.1.2
12. Nitrate | 1 | 9.1 | 12 1,3 | 9.1.2
13. Nitrite | 1 | 9.1 | 12 1,3 | 9.1.2
14. Total Nitrate and Nitrite | 1 | 9.1 | 3 | 9.1.2
15. Selenium | 2 | 9.1 | 3 | 9.1.2
16. Thallium | 2 | 9.1 | 3 | 9.1.2
C. Lead and Copper Rule (Action level for lead is 0.015 mg/L, for copper is 1.3 mg/L)
1. Lead and Copper rule (TT) | 2 | 10.0 | 3 | 10.0
D. Synthetic Organic Chemicals (SOCs)
1
l | 2 | 9.1 | 3 | 9.1.2
12. Nitrate | 1 | 9.1 | 12 1,3 | 9.1.2
13. Nitrite | 1 | 9.1 | 12 1,3 | 9.1.2
14. Total Nitrate and Nitrite | 1 | 9.1 | 3 | 9.1.2
15. Selenium | 2 | 9.1 | 3 | 9.1.2
16. Thallium | 2 | 9.1 | 3 | 9.1.2
C. Lead and Copper Rule (Action level for lead is 0.015 mg/L, for copper is 1.3 mg/L)
1. Lead and Copper rule (TT) | 2 | 10.0 | 3 | 10.0
D. Synthetic Organic Chemicals (SOCs)
1. 2,4 - D | 2 | 9.2.1.1 | 3 | 9.2.2
2. 2,4,5 –TP | 2 | 9.2.1.1 | 3 | 9.2.2
3. Alachlor | 2 | 9.2.1.1 | 3 | 9.2.2
4. Atrazine | 2 | 9.2.1.1 | 3 | 9.2.2
5. Benzo(a)pyrene (PAHs) | 2 | 9.2.1.1 | 3 | 9.2.2
6. Carbofuran | 2 | 9.2.1.1 | 3 | 9.2.2
7. Chlordane | 2 | 9.2.1.1 | 3 | 9.2.2
8. Dalapon | 2 | 9.2.1.1 | 3 | 9.2.2
9. Di (2-ethylhexyl) adipate | 2 | 9.2.1.1 | 3 | 9.2.2
10. Di (2-ethylhexyl) phthalate | 2 | 9.2.1.1 | 3 | 9.2.2
11. Dibromochloropropane | 2 | 9.2.1.1 | 3 | 9.2.2
12. Dinoseb | 2 | 9.2.1.1 | 3 | 9.2.2
13. Dioxin (2,3,7,8 – TCDD) | 2 | 9.2.1.1 | 3 | 9.2.2
14. Diquat | 2 | 9.2.1.1 | 3 | 9.2.2
15. Endothall | 2 | 9.2.1.1 | 3 | 9.2.2
16. Endrin | 2 | 9.2.1.1 | 3 | 9.2.2
17. Ethylene Dibromide | 2 | 9.2.1.1 | 3 | 9.2.2
18. Glyphosate | 2 | 9.2.1.1 | 3 | 9.2.2
19. Heptachlor | 2 | 9.2.1.1 | 3 | 9.2.2
20. Heptachlor epoxide | 2 | 9.2.1.1 | 3 | 9.2.2
21. Hexachlorobenzene | 2 | 9.2.1.1 | 3 | 9.2.2
22. Hexachlorocyclopentadiene | 2 | 9.2.1.1 | 3 | 9.2.2
23. Lindane | 2 | 9.2.1.1 | 3 | 9.2.2
24. Methoxychlor | 2 | 9.2.1.1 | 3 | 9.2.2
25. Oxamyl (Vydate) | 2 | 9.2.1.1 | 3 | 9.2.2
26. Pentachlorophenol | 2 | 9.2.1.1 | 3 | 9.2.2
27. Picloram | 2 | 9.2.1.1 | 3 | 9.2.2
28. Polychlorinated biphenyls (PCBs) | 2 | 9.2.1.1 | 3 | 9.2.2
29. Simazine | 2 | 9.2.1.1 | 3 | 9.2.2
30. Toxaphene | 2 | 9.2.1.1 | 3 | 9.2.2
E. Volatile Organic Chemicals (VOCs)
1. Benzene | 2 | 9.2.1.3 | 3 | 9.2.2
2. Carbon tetrachloride | 2 | 9.2.1.3 | 3 | 9.2.2
3. Chlorobenzene (monochlorobenzene) | 2 | 9.2.1.3 | 3 | 9.2.2
4. o-Dichlorobenzene | 2 | 9.2.1.3 | 3 | 9.2.2
5. p-Dichlorobenzene | 2 | 9.2.1.3 | 3 | 9.2.2
6
enyls (PCBs) | 2 | 9.2.1.1 | 3 | 9.2.2
29. Simazine | 2 | 9.2.1.1 | 3 | 9.2.2
30. Toxaphene | 2 | 9.2.1.1 | 3 | 9.2.2
E. Volatile Organic Chemicals (VOCs)
1. Benzene | 2 | 9.2.1.3 | 3 | 9.2.2
2. Carbon tetrachloride | 2 | 9.2.1.3 | 3 | 9.2.2
3. Chlorobenzene (monochlorobenzene) | 2 | 9.2.1.3 | 3 | 9.2.2
4. o-Dichlorobenzene | 2 | 9.2.1.3 | 3 | 9.2.2
5. p-Dichlorobenzene | 2 | 9.2.1.3 | 3 | 9.2.2
6. 1,2-Dichloroethane | 2 | 9.2.1.3 | 3 | 9.2.2
7. 1,1-Dichloroethylene | 2 | 9.2.1.3 | 3 | 9.2.2
8. cis-1,2,-Dichloroethylene | 2 | 9.2.1.3 | 3 | 9.2.2
9. trans-1,2-Dichloroethylene | 2 | 9.2.1.3 | 3 | 9.2.2
10. Dichloromethane | 2 | 9.2.1.3 | 3 | 9.2.2
11. 1,2-Dichloropropane | 2 | 9.2.1.3 | 3 | 9.2.2
12. Ethylbenzene | 2 | 9.2.1.3 | 3 | 9.2.2
13. Styrene | 2 | 9.2.1.3 | 3 | 9.2.2
14. Tetrachloroethylene | 2 | 9.2.1.3 | 3 | 9.2.2
15. Toluene | 2 | 9.2.1.3 | 3 | 9.2.2
16. 1,2,4-Trichlorobenzene | 2 | 9.2.1.3 | 3 | 9.2.2
17. 1,1,1-Trichloroethane | 2 | 9.2.1.3 | 3 | 9.2.2
18. 1,1,2-Trichloroethane | 2 | 9.2.1.3 | 3 | 9.2.2
19. Trichloroethylene | 2 | 9.2.1.3 | 3 | 9.2.2
20. Vinyl chloride | 2 | 9.2.1.3 | 3 | 9.2.2
21. Xylenes (total) | 2 | 9.2.1.3 | 3 | 9.2.2
22. Methyl tert Butyl Ether | 2 | 9.2.1.3 | 3 | 9.2.2
F. Radioactive Contaminants
1. Beta/photon emitters | 2 | 16.1.1.4 | 3 | 16.2
2. Alpha emitters | 2 | 16.1.1.3 | 3 | 16.2
3. Combined radium (226 & 228) | 2 | 16.1.1.2 | 3 | 16.2
4. Uranium | 9 2 | 16.1.1.5 | 10 3 | 16.2
G. Disinfection Byproducts (DBPs), Byproduct Precursors, Disinfection Residuals. 13
1. Total trihalomethanes (TTHMs) | 2 | 14 9.2.1.2, 9.2.2.1.11, 9.3.1.1, 9.3.1.2 | 3 | 12.6.1 to 12.6.5, 12.7.1 to 12.7.3, 13.0 to 13.6, 14.0 to 14.9
2. Haloacetic Acids (HAA5) | 2 | 9.2.1.2, 9.2.2.1.11, 9.3.1.1, 9.3.1.2 | 3 | 12.6.1 to 12.6.5, 12.7.1 to 12.7.3, 13.0 to 13.6, 14.0 to 14.9
3. Bromate | 2 | 9.2.1.2, 9.2.2.1.11 | 3 | 12.6.1 to 12.6.5, 12.7.1 to 12.7.3
4. Chlorite | 2 | 9.2.1.2, 9.2.2.1.11 | 3 | 12.6.1 to 12.6.5, 12.7.1 to 12.7.3
5. Chlorine(MRDL) | 2 | 1.19.3.1 | 3 | 12.6.1 to 12.6.5, 12.8.1
6
to 12.7.3, 13.0 to 13.6, 14.0 to 14.9
2. Haloacetic Acids (HAA5) | 2 | 9.2.1.2, 9.2.2.1.11, 9.3.1.1, 9.3.1.2 | 3 | 12.6.1 to 12.6.5, 12.7.1 to 12.7.3, 13.0 to 13.6, 14.0 to 14.9
3. Bromate | 2 | 9.2.1.2, 9.2.2.1.11 | 3 | 12.6.1 to 12.6.5, 12.7.1 to 12.7.3
4. Chlorite | 2 | 9.2.1.2, 9.2.2.1.11 | 3 | 12.6.1 to 12.6.5, 12.7.1 to 12.7.3
5. Chlorine(MRDL) | 2 | 1.19.3.1 | 3 | 12.6.1 to 12.6.5, 12.8.1
6. Chloramine (MRDL) | 2 | 1.19.3.1 | 3 | 12.6.1 to 12.6.5, 12.8.1
7. Chlorine dioxide (MRDL), where any two consecutive daily samples at entrance to the distribution system only are above MRDL | 2 | 1.19.3.1, 12.14.2 | 2 15 ,3 | 12.6.1 to 12.6.5, 12.8.2, 12.14.2
8. Chlorine dioxide (MRDL), where sample(s) in distribution system the next day are also above MRDL | 16 1 | 1.19.3.1, 12.14.2 | 1 | 12.6.1 to 12.6.5, 12.8.2, 12.14.2
9. Control of DBP precursors – TOC (TT) | 2 | 12.16 | 3 | 12.6.1 to 12.6.5, 12.9
10. Bench marking and disinfection profiling | N/A | N/A | 3 | 17.5
11. Development of monitoring plan | N/A | N/A | 3 | 12.11
H. Other Treatment Techniques
1. Acrylamide | 2 | 9.3.3 | N/A | N/A
2. Epichlorohydrin | 2 | 9.3.3 | N/A | N/A
II. Unregulated Contaminant Monitoring 17
A. Unregulated contaminants | N/A | N/A | 3 | 40 CFR 141.40
III. Other Situations Requiring Public Notice
A. Exceedance of nitrate MCL for non-community systems, as allowed by the Division | 1 | 9.1.12 | N/A | N/A
B. Availability of unregulated contaminant monitoring data | 3 | 40 CFR 141.40 | N/A | N/A
C. Waterborne disease outbreak | 1 | 2.0 | N/A | N/A
D. Other waterborne emergency 20 | 1 | N/A | N/A | N/A
E. Other situations as determined by the Division | 21 1,2,3 | N/A | N/A | N/A
F. Source water sample positive for Ground Water Rule Fecal indicators: E. coli , enterococci, or coliphage. | 1 | 8.3 | N/A | N/A
if your home or water system has lead pipes, or
if your home has copper pipes with lead solder, and
if the home is less than five (5) years old
if you have soft or acidic water, or
if water sits in the pipes for several hours
y the Division | 21 1,2,3 | N/A | N/A | N/A
F. Source water sample positive for Ground Water Rule Fecal indicators: E. coli , enterococci, or coliphage. | 1 | 8.3 | N/A | N/A
if your home or water system has lead pipes, or
if your home has copper pipes with lead solder, and
if the home is less than five (5) years old
if you have soft or acidic water, or
if water sits in the pipes for several hours.
Contaminant (units) | Traditional MCL in mg/L | To convert for CCR, multiply by | MCL in CCR units | MCLG | Major sources in drinking water | Health effects language
Microbiological contaminants:
Total Coliform Bacteria† | MCL: (systems that collect ≥40 samples/month) 5% of monthly samples are positive; (systems that collect <40 samples/month) 1 positive monthly sample. | MCL: (systems that collect ≥40 samples/month) 5% of monthly samples are positive; (systems that collect <40 samples/month) 1 positive monthly sample. | 0 | Naturally present in the environment | Coliforms are bacteria that are naturally present in the environment and are used as an indicator that other, potentially harmful, bacteria may be present. Coliforms were found in more samples than allowed and this was a warning of potential problems.
Total Coliform Bacteria † | TT | TT | N/A | Naturally present in the environment | Coliforms are bacteria that are naturally present in the environment and are used as an indicator that other, potentially harmful, waterborne pathogens may be present or that a potential pathway exists through which contaminants may enter the drinking water distribution system. We found coliforms indicating the need to look for potential problems in water treatment or distribution. When this occurs, we are required to conduct assessment(s) to identify problems and to correct any problems that were found during these assessments.
Fecal coliform and E. coli † | 0 | 0 | 0 | Human and animal fecal waste | Fecal coliforms and E. coli are bacteria whose presence indicates that the water may be contaminated with human or animal wastes
al problems in water treatment or distribution. When this occurs, we are required to conduct assessment(s) to identify problems and to correct any problems that were found during these assessments.
Fecal coliform and E. coli † | 0 | 0 | 0 | Human and animal fecal waste | Fecal coliforms and E. coli are bacteria whose presence indicates that the water may be contaminated with human or animal wastes. Microbes in these wastes can cause short term effects, such as diarrhea, cramps, nausea, headaches, or other symptoms. They may pose a special health risk for infants, young children, the elderly, and people with severely-compromised immune systems.
E. coli ‡ | Routine and repeat samples are total coliform-positive and either is E. coli -positive or system fails to take repeat samples following E. coli -positive routine sample or system fails to analyze total coliform—positive repeat sample for E. coli . | Routine and repeat samples are total coliform-positive and either is E. coli -positive or system fails to take repeat samples following E. coli -positive routine sample or system fails to analyze total coliform—positive repeat sample for E. coli . | 0 | Human and animal fecal waste | E. coli are bacteria whose presence indicates that the water may be contaminated with human or animal wastes. Human pathogens in these wastes can cause short term effects, such as diarrhea, cramps, nausea, headaches, or other symptoms. They may pose a special health risk for infants, young children, the elderly, and people with severely-compromised immune systems.
† Until December 31, 2015 ‡ Beginning January 1, 2016
Fecal Indicators (enterococci or coliphage) | TT | TT | N/A | Human and animal fecal waste | Fecal indicators are microbes whose presence indicates that the water may be contaminated with human or animal wastes. Microbes in these wastes can cause short-term health effects, such as diarrhea, cramps, nausea, headaches, or other symptoms
systems.
† Until December 31, 2015 ‡ Beginning January 1, 2016
Fecal Indicators (enterococci or coliphage) | TT | TT | N/A | Human and animal fecal waste | Fecal indicators are microbes whose presence indicates that the water may be contaminated with human or animal wastes. Microbes in these wastes can cause short-term health effects, such as diarrhea, cramps, nausea, headaches, or other symptoms. They may pose a special health risk for infants, young children, the elderly, and people with severely compromised immune systems
Total organic carbon (ppm) | TT | TT | N/A | Naturally present in the environment. | Total organic carbon (TOC) has no health effects. However, total organic carbon provides a medium for the formation of disinfection by products. These byproducts include trihalomethanes (THMs) and haloacetic acids (HAAs). Drinking water containing these byproducts in excess of the MCL may lead to adverse health effects, liver or kidney problems, or nervous system effects, and may lead to an increased risk of getting cancer
Turbidity (NTU) | TT | TT | N/A | Soil runoff | Turbidity has no health effects. However, turbidity can interfere with disinfection and provide a medium for microbial growth. Turbidity may indicate the presence of disease-causing organisms. These organisms include bacteria, viruses, and parasites that can cause symptoms such as nausea, cramps, diarrhea and associated headaches.
Radioactive contaminants:
Beta/photon emitters (mrem/yr) | 4 mrem/yr | 4 | 0 | Decay of natural and man-made deposits | Certain minerals are radioactive and may emit forms of radiation known as photons and beta radiation. Some people who drink water containing beta particle and photon radioactivity in excess of the MCL over many years may have an increased risk of getting cancer.
Alpha emitters (pCi/L) | 15 pCi/L | 15 | 0 | Erosion of natural deposits | Certain minerals are radioactive and may emit a form of radiation known as alpha radiation
tive and may emit forms of radiation known as photons and beta radiation. Some people who drink water containing beta particle and photon radioactivity in excess of the MCL over many years may have an increased risk of getting cancer.
Alpha emitters (pCi/L) | 15 pCi/L | 15 | 0 | Erosion of natural deposits | Certain minerals are radioactive and may emit a form of radiation known as alpha radiation. Some people who drink water containing alpha emitters in excess of the MCL over many years may have an increased risk of getting cancer.
Combined radium (pCi/L) | 5 pCi/L | 5 | 0 | Erosion of natural deposits | Some people who drink water containing radium-226 or -228 in excess of the MCL over many years may have an increased risk of getting cancer.
Uranium (pCi/L) | 30 μg/L | 30 | 0 | Erosion of natural deposits | Some people who drink water containing uranium in excess of the MCL over many years may have an increased risk of getting cancer and kidney toxicity.
Inorganic contaminants:
Antimony (ppb) | 0.006 | 1000 | 6 | 6 | Discharge from petroleum refineries; fire retardants; ceramics; electronics; solder. | Some people who drink water containing antimony well in excess of the MCL over many years could experience increases in blood cholesterol and decreases in blood sugar.
Arsenic (ppb) | 0.010 | 1000 | 10 | 0 | Erosion of natural deposits; Runoff from orchards; Runoff from glass and electronics production wastes. | Some people who drink water containing arsenic in excess of the MCL over many years could experience skin damage or problems with their circulatory system, and may have an increased risk of getting cancer.
Asbestos (MFL) | 7 MFL | 7 | 7 | Decay of asbestos cement water mains; Erosion of natural deposits. | Some people who drink water containing asbestos in excess of the MCL over many years may have an increased risk of developing benign intestinal polyps.
Barium (ppm) | 2 | 2 | 2 | Discharge of drilling wastes; Discharge from metal refineries; Erosion of natural deposits
ased risk of getting cancer.
Asbestos (MFL) | 7 MFL | 7 | 7 | Decay of asbestos cement water mains; Erosion of natural deposits. | Some people who drink water containing asbestos in excess of the MCL over many years may have an increased risk of developing benign intestinal polyps.
Barium (ppm) | 2 | 2 | 2 | Discharge of drilling wastes; Discharge from metal refineries; Erosion of natural deposits. | Some people who drink water containing barium in excess of the MCL over many years could experience an increase in their blood pressure.
Beryllium (ppb) | 0.004 | 1000 | 4 | 4 | Discharge from metal refineries and coal-burning factories; Discharge from electrical, aerospace, and defense industries. | Some people who drink water containing beryllium well in excess of the MCL over many years could develop intestinal lesions
Bromate (ppb) | 0.010 | 1000 | 10 | 0 | By-product of drinking water disinfection. | Some people who drink water of containing bromate in excess of the MCL over many years may have an increased risk of getting cancer.
Cadmium (ppb) | 0.005 | 1000 | 5 | 5 | Corrosion of galvanized pipes; Erosion of natural deposits; Discharge from metal refineries; Runoff from waste batteries and paints. | Some people who drink water containing cadmium in excess of the MCL over many years could experience kidney damage.
Chloramines (ppm) | MRDL=4 | MRDL=4 | MRDLG=4 | Water additive used to control microbes. | Some people who use water containing chloramines well in excess of the MRDL could experience irritating effects to their eyes and nose. Some people who drink water containing chloramines well in excess of the MRDL could experience stomach discomfort or anemia.
Chlorine (ppm) | MRDL=4 | MRDL=4 | MRDLG=4 | Water additive used to control microbes. | Some people who use water containing chlorine well in excess of the MRDL could experience irritating effects to their eyes and nose. Some people who drink water containing chlorine well in excess of the MRDL could experience stomach discomfort
in excess of the MRDL could experience stomach discomfort or anemia.
Chlorine (ppm) | MRDL=4 | MRDL=4 | MRDLG=4 | Water additive used to control microbes. | Some people who use water containing chlorine well in excess of the MRDL could experience irritating effects to their eyes and nose. Some people who drink water containing chlorine well in excess of the MRDL could experience stomach discomfort.
Chlorine dioxide (ppb) | MRDL=0.8 | 1000 | MRDL=800 | MRDLG=800 | Water additive used to control microbes. | Some infants and young children who drink water chlorine dioxide in excess of the MRDL could experience nervous system effects. Similar effects may occur in fetuses of pregnant women who drink water containing chlorine dioxide in excess of the MRDL. Some people may experience anemia.
Chlorite (ppm) | 1 | 1 | 0.8 | By-product of drinking water disinfection. | Some infants and young children who drink water containing chlorite in excess of the MCL could experience nervous system effects. Similar effects may occur in fetuses of pregnant women who drink water containing chlorite in excess of the MCL. Some people may experience anemia.
Chromium (ppb) | 0.1 | 1000 | 100 | 100 | Discharge from steel and pulp mills; Erosion of natural deposits. | Some people who use water containing chromium well in excess of the MCL over many years could experience allergic dermatitis.
Copper (ppm) | AL=1.3 | AL=1.3 | 1.3 | Corrosion of household plumbing systems; Erosion of natural deposits. | Copper is an essential nutrient, but some people who drink water containing copper in excess of the action level over a relatively short amount of time could experience gastrointestinal distress. Some people who drink water containing copper in excess of the action level over many years could suffer liver or kidney damage. People with Wilson’s disease should consult their personal doctor.
Cyanide (ppb) | 0.2 | 1000 | 200 | 200 | Discharge from steel/metal factories; Discharge from plastic and fertilizer factories
a relatively short amount of time could experience gastrointestinal distress. Some people who drink water containing copper in excess of the action level over many years could suffer liver or kidney damage. People with Wilson’s disease should consult their personal doctor.
Cyanide (ppb) | 0.2 | 1000 | 200 | 200 | Discharge from steel/metal factories; Discharge from plastic and fertilizer factories. | Some people who drink water containing cyanide well in excess of the MCL over many years could experience nerve damage or problems with their thyroid.
Fluoride (ppm) | 2 | 2 | 2 | Erosion of natural deposits; Water additive which promotes strong teeth; Discharge from fertilizer and aluminum factories. | Some people who drink water containing fluoride in excess of double the MCL over many years could get bone disease, including pain and tenderness of the bones. Fluoride in drinking water in excess of the MCL but less than twice the MCL may cause mottling of children’s teeth, usually in children less than nine years old. Mottling, also known as dental fluorosis, may include brown staining and/or pitting of the teeth, and occurs only in developing teeth before they erupt from the gums.
Lead (ppb) | AL=0.015 | 1000 | AL=15 | 0 | Corrosion of household plumbing systems; Erosion of natural deposits. | Infants and children who drink water containing lead in excess of the action level could experience delays in their physical or mental development. Children could show slight deficits in attention span and learning abilities. Adults who drink this water over many years could develop kidney problems or high blood pressure.
Mercury [inorganic] (ppb) | 0.002 | 1000 | 2 | 2 | Erosion of natural deposits; Discharge from refineries and factories; Runoff from landfills; Runoff from cropland. | Some people who drink water containing inorganic mercury well in excess of the MCL over many years could experience kidney damage
ies. Adults who drink this water over many years could develop kidney problems or high blood pressure.
Mercury [inorganic] (ppb) | 0.002 | 1000 | 2 | 2 | Erosion of natural deposits; Discharge from refineries and factories; Runoff from landfills; Runoff from cropland. | Some people who drink water containing inorganic mercury well in excess of the MCL over many years could experience kidney damage.
Nickel (ppm) | 0.1 | 1000 | 100 | 100 | Erosion of natural deposits | Some people who drink water containing nickel well in excess of the MCL over many years could experience heart and liver damage.
Nitrate (ppm) | 10 | 10 | 10 | Runoff from fertilizer use; Leaching from septic tanks, sew age; Erosion of natural deposits. | Infants below the age of six months who drink water containing nitrate in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue baby syndrome.
Nitrite (ppm) | 1 | 1 | 1 | Runoff from fertilizer use; Leaching from septic tanks, sewage; Erosion of natural deposits. | Infants below the age of six months who drink water containing nitrite in excess of the MCL could become seriously ill and, if untreated, may die. Symptoms include shortness of breath and blue baby syndrome.
Selenium (ppb) | 0.05 | 1000 | 50 | 50 | Discharge from petroleum and metal refineries; Erosion of natural deposits; Discharge from mines. | Selenium is an essential nutrient. However, some people who drink water containing selenium in excess of the MCL over many years could experience hair or fingernail losses, numbness in fingers or toes, or problems with their circulation.
Thallium (ppb) | 0.002 | 1000 | 2 | 0.5 | Leaching from ore-processing sites; Discharge from electronics, glass, and drug factories. | Some people who drink water containing thallium in excess of the MCL over many years could experience hair loss, changes in their blood, or problems with their kidneys, intestines, or liver
il losses, numbness in fingers or toes, or problems with their circulation.
Thallium (ppb) | 0.002 | 1000 | 2 | 0.5 | Leaching from ore-processing sites; Discharge from electronics, glass, and drug factories. | Some people who drink water containing thallium in excess of the MCL over many years could experience hair loss, changes in their blood, or problems with their kidneys, intestines, or liver.
Synthetic organic contaminants including pesticides and herbicides:
2,4-D (ppb) | 0.07 | 1000 | 70 | 70 | Runoff from herbicide used on row crops. | Some people who drink water containing the weed killer 2,4-D well in excess of the MCL over many years could experience problems with their kidneys, liver, or adrenal glands.
2,4,5-TP [Silvex] (ppb) | 0.05 | 1000 | 50 | 50 | Residue of banned herbicide | Some people who drink water containing silvex in excess of the MCL over many years could experience liver problems.
Acrylamide | TT | TT | 0 | Added to water during sewage/ wastewater treatment. | Some people who drink water containing high levels of acrylamide over a long period of time could have problems with their nervous system or blood, and may have an increased risk of getting cancer.
Alachlor (ppb) | 0.002 | 1000 | 2 | 0 | Runoff from herbicide used on row crops. | Some people who drink water containing alachlor in excess of the MCL over many years could have problems with their eyes, liver, kidneys, or spleen, or experience anemia, and may have an increased risk of getting cancer.
Atrazine (ppb) | 0.003 | 1000 | 3 | 3 | Runoff from herbicide used on row crops. | Some people who drink water containing atrazine well in excess of the MCL over many years could experience problems with their cardiovascular system or reproductive difficulties.
Benzo(a)pyrene [PAH] (ppt) | 0.0002 | 1,000,000 | 200 | 0 | Leaching from linings of water storage tanks and distribution lines
ng cancer.
Atrazine (ppb) | 0.003 | 1000 | 3 | 3 | Runoff from herbicide used on row crops. | Some people who drink water containing atrazine well in excess of the MCL over many years could experience problems with their cardiovascular system or reproductive difficulties.
Benzo(a)pyrene [PAH] (ppt) | 0.0002 | 1,000,000 | 200 | 0 | Leaching from linings of water storage tanks and distribution lines. | Some people who drink water containing benzo(a)pyrene in excess of the MCL over many years may experience reproductive difficulties and may have an increased risk of getting cancer.
Carbofuran (ppb) | 0.04 | 1000 | 40 | 40 | Leaching of soil fumigant used on rice and alfalfa. | Some people who drink water containing carbofuran in excess of the MCL over many years could experience problems with their blood, or nervous or reproductive systems.
Chlordane (ppb) | 0.002 | 1000 | 2 | 0 | Residue of banned termiticide | Some people who drink water containing chlordane in excess of the MCL over many years could experience problems with their liver or nervous system, and may have an increased risk of getting cancer.
Dalapon (ppb) | 0.2 | 1000 | 200 | 200 | Runoff from herbicide used on rights of way. | Some people who drink water containing dalapon well in excess of the MCL over many years could experience minor kidney changes.
Di(2-ethylhexyl) adipate (ppb) | 0.4 | 1000 | 400 | 400 | Discharge from chemical factories. | Some people who drink water containing di(2-ethylhexyl) adipate well in excess of the MCL over many years could experience toxic effects such as weight loss, liver enlargement or possible reproductive difficulties.
Di(2-ethylhexyl) phthalate (ppb) | 0.006 | 1000 | 6 | 0 | Discharge from rubber and chemical factories. | Some people who drink water containing di(2-ethylhexyl)phthalate well in excess of the MCL over many years may have problems with their liver, or experience reproductive difficulties, and may have an increased risk of getting cancer
oss, liver enlargement or possible reproductive difficulties.
Di(2-ethylhexyl) phthalate (ppb) | 0.006 | 1000 | 6 | 0 | Discharge from rubber and chemical factories. | Some people who drink water containing di(2-ethylhexyl)phthalate well in excess of the MCL over many years may have problems with their liver, or experience reproductive difficulties, and may have an increased risk of getting cancer.
Dibromochloropropane (ppt) | 0.0002 | 1,000,000 | 200 | 0 | Runoff/leaching from soil fumigant used on soybeans, cotton, pineapples, and orchards. | Some people who drink water containing DBCP in excess of the MCL over many years could experience reproductive problems and may have an increased risk of getting cancer.
Dinoseb (ppb) | 0.007 | 1000 | 7 | 7 | Runoff from herbicide used on soybeans and vegetables. | Some people who drink water containing dinoseb well in excess of the MCL over many years could experience reproductive difficulties.
Diquat (ppb) | 0.02 | 1000 | 20 | 20 | Runoff from herbicide use | Some people who drink water containing diquat in excess of the MCL over many years could get cataracts.
Dioxin [2,3,7,8-TCDD] (ppq) | 0.00000003 | 1,000,000,000 | 30 | 0 | Emissions from waste incineration and other combustion; Discharge from chemical factories. | Some people who drink water containing dioxin in excess of the MCL over many years could experience reproductive difficulties and may have an increased risk of getting cancer.
Endothall (ppb) | 0.1 | 1000 | 100 | 100 | Runoff from herbicide use | Some people who drink water containing endothall in excess of the MCL over many years could experience problems with their stomach or intestines.
Endrin (ppb) | 0.002 | 1000 | 2 | 2 | Residue of banned insecticide | Some people who drink water containing endrin in excess of the MCL over many years could experience liver problems.
Epichlorohydrin | TT | TT | 0 | Discharge from industrial chemical factories; An impurity of some water treatment chemicals
ess of the MCL over many years could experience problems with their stomach or intestines.
Endrin (ppb) | 0.002 | 1000 | 2 | 2 | Residue of banned insecticide | Some people who drink water containing endrin in excess of the MCL over many years could experience liver problems.
Epichlorohydrin | TT | TT | 0 | Discharge from industrial chemical factories; An impurity of some water treatment chemicals. | Some people who drink water containing high levels of epichlorohydrin over a long period of time could experience stomach problems, and may have an increased risk of getting cancer.
Ethylene dibromide (ppt) | 0.00005 | 1,000,000 | 50 | 0 | Discharge from petroleum refineries. | Some people who drink water containing ethylene dibromide in excess of the MCL over many years could experience problems with their liver, stomach, reproductive system, or kidneys, and may have an increased risk of getting cancer.
Glyphosate (ppb) | 0.7 | 1000 | 700 | 700 | Runoff from herbicide use | Some people who drink water containing glyphosate in excess of the MCL over many years could experience problems with their kidneys or reproductive difficulties.
Heptachlor (ppt) | 0.0004 | 1,000,000 | 400 | 0 | Residue of banned pesticide | Some people who drink water containing heptachlor in excess of the MCL over many years could experience liver damage and may have an increased risk of getting cancer.
Heptachlor epoxide (ppt) | 0.0002 | 1,000,000 | 200 | 0 | Breakdown of heptachlor | Some people who drink water containing heptachlor epoxide in excess of the MCL over many years could experience liver damage, and may have an increased risk of getting cancer.
Hexachlorobenzene (ppb) | 0.001 | 1000 | 1 | 0 | Discharge from metal refineries and agricultural chemical factories. | Some people who drink water containing hexachlorobenzene in excess of the MCL over many years could experience problems with their liver or kidneys, or adverse reproductive effects, and may have an increased risk of getting cancer
and may have an increased risk of getting cancer.
Hexachlorobenzene (ppb) | 0.001 | 1000 | 1 | 0 | Discharge from metal refineries and agricultural chemical factories. | Some people who drink water containing hexachlorobenzene in excess of the MCL over many years could experience problems with their liver or kidneys, or adverse reproductive effects, and may have an increased risk of getting cancer.
Hexachlorocyclopentadiene (ppb) | 0.05 | 1000 | 50 | 50 | Discharge from chemical factories. | Some people who drink water containing Hexachlorocyclopentadiene well in excess of the MCL over many years could experience problems with their kidneys or stomach.
Lindane (ppt) | 0.0002 | 1,000,000 | 200 | 200 | Runoff/leaching from insecticide used on cattle, lumber, gardens. | Some people who drink water containing lindane in excess of the MCL over many years could experience problems with their kidneys or liver.
Methoxychlor (ppb) | 0.04 | 1000 | 40 | 40 | Runoff/leaching from insecticide used on fruits, vegetables, alfalfa, livestock. | Some people who drink water containing methoxychlor in excess of the MCL over many years could experience reproductive difficulties.
Oxamyl [Vydate] (ppb) | 0.2 | 1000 | 200 | 200 | Runoff/leaching from insecticide used on apples, potatoes and tomatoes. | Some people who drink water containing oxamyl in excess of the MCL over many years could experience slight nervous system effects.
PCBs [Polychlorinated biphenyls] (ppt) | 0.0005 | 1,000,000 | 500 | 0 | Runoff from landfills; Discharge of waste chemicals. | Some people who drink water containing PCBs in excess of the MCL over many years could experience changes in their skin, problems with their thymus gland, immune deficiencies, or reproductive or nervous system difficulties, and may have an increased risk of getting cancer.
Pentachlorophenol (ppb) | 0.001 | 1000 | 1 | 0 | Discharge from wood preserving factories
lls; Discharge of waste chemicals. | Some people who drink water containing PCBs in excess of the MCL over many years could experience changes in their skin, problems with their thymus gland, immune deficiencies, or reproductive or nervous system difficulties, and may have an increased risk of getting cancer.
Pentachlorophenol (ppb) | 0.001 | 1000 | 1 | 0 | Discharge from wood preserving factories. | Some people who drink water containing pentachlorophenol in excess of the MCL over many years could experience problems with their liver or kidneys, and may have an increased risk of getting cancer
Picloram (ppb) | 0.5 | 1000 | 500 | 500 | Herbicide runoff | Some people who drink water containing picloram in excess of the MCL over many years could experience problems with their liver.
Simazine (ppb) | 0.004 | 1000 | 4 | 4 | Herbicide runoff | Some people who drink water containing simazine in excess of the MCL over many years could experience problems with their blood
Toxaphene (ppb) | 0.003 | 1000 | 3 | 0 | Runoff/leaching from insecticide used on cotton and cattle. | Some people who drink water containing toxaphene in excess of the MCL over many years could have problems with their kidneys, liver, or thyroid, and may have an increased risk of getting cancer.
Volatile organic contaminants:
Benzene (ppb) | 0.005 | 1000 | 5 | 0 | Discharge from factories; Leaching from gas storage tanks and landfills. | Some people who drink water containing benzene in excess of the MCL over many years could experience anemia or a decrease in blood platelets, and may have an increased risk of getting cancer.
Carbon tetrachloride (ppb) | 0.005 | 1000 | 5 | 0 | Discharge from chemical plants and other industrial activities. | Some people who drink water containing carbon tetrachloride in excess of the MCL over many years could experience problems with their liver and may have an increased risk of getting cancer.
Chlorobenzene (ppb) | 0.1 | 1000 | 100 | 100 | Discharge from chemical and agricultural chemical factories
loride (ppb) | 0.005 | 1000 | 5 | 0 | Discharge from chemical plants and other industrial activities. | Some people who drink water containing carbon tetrachloride in excess of the MCL over many years could experience problems with their liver and may have an increased risk of getting cancer.
Chlorobenzene (ppb) | 0.1 | 1000 | 100 | 100 | Discharge from chemical and agricultural chemical factories. | Some people who drink water containing chlorobenzene in excess of the MCL over many years could experience problems with their liver or kidneys.
o-Dichlorobenzene (ppb) | 0.6 | 1000 | 600 | 600 | Discharge from industrial chemical factories. | Some people who drink water containing o-dichlorobenzene well in excess of the MCL over many years could experience problems with their liver, kidneys, or circulatory systems.
p-Dichlorobenzene (ppb) | 0.075 | 1000 | 75 | 75 | Discharge from industrial chemical factories. | Some people who drink water containing p-dichlorobenzene in excess of the MCL over many years could experience anemia, damage to their liver, kidneys, or spleen, or changes in their blood.
1,2-Dichloroethane (ppb) | 0.005 | 1000 | 5 | 0 | Discharge from industrial chemical factories. | Some people who drink water containing 1,2-dichloroethane in excess of the MCL over many years may have an increased risk of getting cancer.
1,1-Dichloroethylene (ppb) | 0.007 | 1000 | 7 | 7 | Discharge from industrial chemical factories. | Some people who drink water containing 1,1-dichloroethylene in excess of the MCL over many years could experience problems with their liver.
cis-1,2-Dichloroethylene (ppb) | 0.07 | 1000 | 70 | 70 | Discharge from industrial chemical factories. | Some people who drink water containing cis-1,2- dichloroethylene in excess of the MCL over many years could experience problems with their liver
trans-1,2- Dichloroethylene (ppb) | 0.1 | 1000 | 100 | 100 | Discharge from industrial chemical factories
could experience problems with their liver.
cis-1,2-Dichloroethylene (ppb) | 0.07 | 1000 | 70 | 70 | Discharge from industrial chemical factories. | Some people who drink water containing cis-1,2- dichloroethylene in excess of the MCL over many years could experience problems with their liver
trans-1,2- Dichloroethylene (ppb) | 0.1 | 1000 | 100 | 100 | Discharge from industrial chemical factories. | Some people who drink water containing trans-1,2- dichloroethylene well in excess of the MCL over many years could experience problems with their liver.
Dichloromethane (ppb) | 0.005 | 1000 | 5 | 0 | Discharge from pharmaceutical and chemical factories. | Some people who drink water containing dichloromethane in excess of the MCL over many years could have liver problems and may have an increased risk of getting cancer.
1,2-Dichloropropane (ppb) | 0.005 | 1000 | 5 | 0 | Discharge from industrial chemical factories. | Some people who drink water containing 1,2-dichloropropane in excess of the MCL over many years may have an increased risk of getting cancer.
Ethylbenzene (ppb) | 0.7 | 1000 | 700 | 700 | Discharge from petroleum refineries. | Some people who drink water containing ethylbenzene well in excess of the MCL over many years could experience problems with their liver or kidneys.
Haloacetic Acids (HAA) (ppb) | 0.060 | 1000 | 60 | N/A | By-product of drinking water disinfection. | Some people who drink water containing haloacetic acids in excess of the MCL over many years may have an increased risk of getting cancer
Methyl tert Butyl Ether (MTBE) (ppb) | 0.01 | 1000 | 10 | 10 | Discharge from petroleum refineries; Leaching from gas storage tanks | Some people who drink water containing MTBE in excess of the MCL over many years may experience problems of the central nervous system, including loss of muscle coordination, tremors, difficulty breathing, and drowsiness.
Styrene (ppb) | 0.1 | 1000 | 100 | 100 | Discharge from rubber and plastic factories; Leaching from landfills
scharge from petroleum refineries; Leaching from gas storage tanks | Some people who drink water containing MTBE in excess of the MCL over many years may experience problems of the central nervous system, including loss of muscle coordination, tremors, difficulty breathing, and drowsiness.
Styrene (ppb) | 0.1 | 1000 | 100 | 100 | Discharge from rubber and plastic factories; Leaching from landfills. | Some people who drink water containing styrene well in excess of the MCL over many years could have problems with their liver, kidneys, or circulatory system.
Tetrachloroethylene (ppb) | 0.001 | 1000 | 1 | 0 | Discharge from factories and dry cleaners. | Some people who drink water containing tetrachloroethylene in excess of the MCL over many years could have problems with their liver, and may have an increased risk of getting cancer.
1,2,4-Trichlorobenzene (ppb) | 0.07 | 1000 | 70 | 70 | Discharge from textile-finishing factories. | Some people who drink water containing 1,2,4- trichlorobenzene well in excess of the MCL over many years could experience changes in their adrenal glands.
1,1,1-Trichloroethane (ppb) | 0.2 | 1000 | 200 | 200 | Discharge from metal degreasing sites and other factories. | Some people who drink water containing 1,1,1-trichloroethane in excess of the MCL over many years could experience problems with their liver, nervous system, or circulatory system.
1,1,2-Trichloroethane (ppb) | 0.005 | 1000 | 5 | 3 | Discharge from industrial chemical factories. | Some people who drink water containing 1,1,2-trichloroethane well in excess of the MCL over many years could have problems with their liver, kidneys, or immune systems.
Trichloroethylene (ppb) | 0.001 | 1000 | 1 | 0 | Discharge from metal degreasing sites and other factories
or circulatory system.
1,1,2-Trichloroethane (ppb) | 0.005 | 1000 | 5 | 3 | Discharge from industrial chemical factories. | Some people who drink water containing 1,1,2-trichloroethane well in excess of the MCL over many years could have problems with their liver, kidneys, or immune systems.
Trichloroethylene (ppb) | 0.001 | 1000 | 1 | 0 | Discharge from metal degreasing sites and other factories. | Some people who drink water containing trichloroethylene in excess of the MCL over many years could experience problems with their liver and may have an increased risk of getting cancer
TTHMs [Total trihalomethanes] (ppb) | 0.080 | 1000 | 100/80 | N/A | By-product of drinking water disinfection. | Some people who drink water containing trihalomethanes in excess of the MCL over many years may experience problems with their liver, kidneys, or central nervous systems, and may have an increased risk of getting cancer.
Toluene (ppm) | 1 | 1 | 1 | Discharge from petroleum factories. | Some people who drink water containing toluene well in excess of the MCL over many years could have problems with their nervous system, kidneys, or liver.
Vinyl Chloride (ppb) | 0.001 | 1000 | 1 | 0 | Leaching from PVC piping; Discharge from plastics factories. | Some people who drink water containing vinyl chloride in excess of the MCL over many years may have an increased risk of getting cancer.
Xylenes (ppm) | 10 | 10 | 10 | Discharge from petroleum factories; Discharge from chemical factories. | Some people who drink water containing xylenes in excess of the MCL over many years could experience damage to their nervous system
from plastics factories. | Some people who drink water containing vinyl chloride in excess of the MCL over many years may have an increased risk of getting cancer.
Xylenes (ppm) | 10 | 10 | 10 | Discharge from petroleum factories; Discharge from chemical factories. | Some people who drink water containing xylenes in excess of the MCL over many years could experience damage to their nervous system.
Population Served | Number of Samples Per Month
25-1,000 | 1
1,001-2,500 | 2
2,501-3,300 | 3
3,301-4,100 | 4
4,101-4,900 | 5
4,901-5,800 | 6
5,801-6,700 | 7
6,701-7,600 | 8
7,601-8,500 | 9
8,501-12,900 | 10
12,901-17,200 | 15
17,201-21,500 | 20
21,501-25,000 | 25
25,001-33,000 | 30
33,001-41,000 | 40
41,001-50,000 | 50
50,001-59,000 | 60
59,001-70,000 | 70
70,001-83,000 | 80
83,001-96,000 | 90
96,001-130,000 | 100
130,001-220,000 | 120
Organism | Methodology category | Method 1 | Citation 1
Total Coliforms | Lactose Fermentation Methods | Standard Total Coliform Fermentation Technique | Standard Methods 9221 B.1, B.2 (20th ed.; 21st ed.) 2 3 Standard Methods Online 9221 B.1, B.2–99 2 3
Presence-Absence (P–A) Coliform Test. | Standard Methods 9221 D.1, D.2 (20th ed.; 21st ed.) 2 7 Standard Methods Online 9221 D.1, D.2–99 2 7
Membrane Filtration Methods | Standard Total Coliform Membrane Filter Procedure. | Standard Methods 9222 B, C (20th ed.; 21st ed.) 2 4
Standard Methods Online 9222 B– 97 2 4, 9222 C–97 2 4
Membrane Filtration using MI medium. m-ColiBlue24R Test 2 4 Chromocult 2 4 | EPA Method 1604 2
Enzyme Substrate Methods | Colilert® | Standard Methods 9223 B (20th ed.; 21st ed.) 2 5
Standard Methods Online 9223 B–97 2 5 Colisure® E*Colite® Test 2 Readycult® Test 2 modified Colitag® Test 2 | Standard Methods 9223 B (20th ed.; 21st ed.) 2 5 6 Standard Methods Online 9223 B–97 2 5 6
Escherichia coli | Escherichia coli Procedure (following Lactose Fermentation Methods)
2 4 | EPA Method 1604 2
Enzyme Substrate Methods | Colilert® | Standard Methods 9223 B (20th ed.; 21st ed.) 2 5
Standard Methods Online 9223 B–97 2 5 Colisure® E*Colite® Test 2 Readycult® Test 2 modified Colitag® Test 2 | Standard Methods 9223 B (20th ed.; 21st ed.) 2 5 6 Standard Methods Online 9223 B–97 2 5 6
Escherichia coli | Escherichia coli Procedure (following Lactose Fermentation Methods). Escherichia coli Partition Method | EC–MUG medium | Standard Methods 9221 F.1 (20th ed.; 21st ed.) 2
EC broth with MUG (EC–MUG) | Standard Methods 9222 G.1 c (2) (20th ed.; 21st ed.) 2 8
NA–MUG medium | Standard Methods 9222 G.1 c (1) (20th ed.; 21st ed.) 2
Membrane Filtration Methods | Membrane Filtration using MI medium. | EPA Method 1604 2
m-ColiBlue24® Test 2 4
Chromocult 2 4
Enzyme Substrate Methods | Colilert® | Standard Methods 9223 B (20th ed.; 21st ed.) 2 5 Standard Methods Online 9223 B– 97 2 5 6
Colisure® E*Colite® Test 2 Readycult® Test 2 modified Colitag® Test 2 | Standard Methods 9223 B (20th ed.; 21st ed.) 2 5 6 Standard Methods Online 9223 B–97 2 5 6
Population served | Minimum number of samples per month
1,001 to 2,500 | 2
2,501 to 3,300 | 3
3,301 to 4,100 | 4
4,101 to 4,900 | 5
4,901 to 5,800 | 6
5,801 to 6,700 | 7
6,701 to 7,600 | 8
7,601 to 8,500 | 9
8,501 to 12,900 | 10
12,901 to 17,200 | 15
17,201 to 21,500 | 20
21,501 to 25,000 | 25
25,001 to 33,000 | 30
33,001 to 41,000 | 40
41,001 to 50,000 | 50
50,001 to 59,000 | 60
59,001 to 70,000 | 70
70,001 to 83,000 | 80
83,001 to 96,000 | 90
96,001 to 130,000 | 100
130,001 to 220,000 | 120
220,001 to 320,000 | 150
320,001 to 450,000 | 180
450,001 to 600,000 | 210
600,001 to 780,000 | 240
780,001 to 90,000 | 270
970,001 to 1,230,000 | 300
1,230,001 to 1,520,000 | 330
1,520,001 to 1,850,000 | 360
1,850,001 to 2,270,000 | 390
2,270,001 to 3,020,000 | 420
3,020,001 to 3,960,000 | 450
3,960,001 or more | 480
Fecal Indicator 1 | Methodology | Method Citation
E
100
130,001 to 220,000 | 120
220,001 to 320,000 | 150
320,001 to 450,000 | 180
450,001 to 600,000 | 210
600,001 to 780,000 | 240
780,001 to 90,000 | 270
970,001 to 1,230,000 | 300
1,230,001 to 1,520,000 | 330
1,520,001 to 1,850,000 | 360
1,850,001 to 2,270,000 | 390
2,270,001 to 3,020,000 | 420
3,020,001 to 3,960,000 | 450
3,960,001 or more | 480
Fecal Indicator 1 | Methodology | Method Citation
E. coli | Colilert 3 Colisure 3 Membrane Filter Method with MI Agar m-Coliblue24 Test 5 E*Colite Test 6 EC-MUG 7 NA-MUG 7 | 9223 B. 2 9223 B. 2 EPA Method 1604 4 9221 F. 2 9222 G. 2
Enterococci | Multiple Tube Technique Membrane Filter Technique Membrane Filter Technique Enterolert 9 ………………………………………………… | 9230B. 2 9230C. 2 EPA Method 1600 8
Coliphage | Two-Step Enrichment Presence-Absence Procedure Single Agar Layer Procedure | EPA Method 1601. 10 EPA Method 1602. 11
PMCLs Substance | MCL
Antimony (Sb) | 0.006 mg/L
Arsenic (As) | 0.010 mg/L
Asbestos | 7 MF/L*
Barium (Ba) | 2 mg/L
Beryllium (Be) | 0.004 mg/L
Cadmium (Cd) | 0.005 mg/L
Chromium (Cr) | 0.1 mg/L
Cyanide (Cn) | 0.2 mg/L
Fluoride (F) | 2.0 mg/L (See subsections 9.1.8 and 9.1.14)
Mercury (Hg) | 0.002 mg/L
Nickel (Ni) | 0.1 mg/L
Nitrate-Nitrogen (NO3-N) | 10 mg/L (See subsections 9.1.6 and 9.1.8)
Nitrite-Nitrogen (NO2-N) | 1 mg/L (See subsections 9.1.7 and 9.1.8)
Total Nitrate-Nitrogen and Nitrite-Nitrogen (NO3-N + NO2-N) | 10 mg/L
Selenium (Se) | 0.05 mg/L
Thallium (Tl) | 0.002 mg/L
Turbidity | See subsection 7.1
SMCLs Substance | MCL
Aluminum | 0.05–0.2 mg/L
Chloride (Cl) | 250 mg/L
Color | 15 color units
Corrosivity | Noncorrosive (See Section 11.0)
Foaming agents | 0.50 mg/L
Iron (Fe) | 0.30 mg/L
Manganese (Mn) | 0.05 mg/L
Odor | 3 threshold odor number
pH | 6.5-8.5
Silver | 0.1 mg/L
Sulfate (SO4) | 250 mg/L
Total Dissolved Solids (TDS) | 500 mg/L
Zinc (Zn) | 5 mg/L
Lead | 0 mg/L
Copper | 1.3 mg/L
Contaminant | MCL
Alachlor | 0.002 mg/L
Atrazine | 0.003 mg/L
Benzo(a)pyrene | 0.0002 m g/L
Carbofuran | 0.04 mg/L
Chlordane | 0.002 mg/L
Dalapon | 0.2 mg/L
Di(2-eth
50 mg/L
Iron (Fe) | 0.30 mg/L
Manganese (Mn) | 0.05 mg/L
Odor | 3 threshold odor number
pH | 6.5-8.5
Silver | 0.1 mg/L
Sulfate (SO4) | 250 mg/L
Total Dissolved Solids (TDS) | 500 mg/L
Zinc (Zn) | 5 mg/L
Lead | 0 mg/L
Copper | 1.3 mg/L
Contaminant | MCL
Alachlor | 0.002 mg/L
Atrazine | 0.003 mg/L
Benzo(a)pyrene | 0.0002 m g/L
Carbofuran | 0.04 mg/L
Chlordane | 0.002 mg/L
Dalapon | 0.2 mg/L
Di(2-ethylhexyl) adipate | 0.4 mg/L
Di(2-ethylhexyl) phthalate | 0.006 mg/L
Dibromochloropropane | 0.0002 mg/L
Dinoseb | 0.007 mg/L
Diquat | 0.02 mg/L
2,4-D | 0.07 mg/L
Endothall | 0.1 mg/L
Endrin | 0.002 mg/L
Ethylenedibromide (EDB) | 0.00005 mg/L
Glyphosate | 0.7 mg/L
Heptachlor | 0.0004 mg/L
Heptachlor epoxide | 0.0002 mg/L
Hexachlorobenzene | 0.001 mg/L
Hexachlorocyclopentadiene | 0.05 mg/L
Lindane | 0.0002 mg/L
Methoxychlor | 0.04 mg/L
Oxamyl (Vydate) | 0.2 mg/L
Pentachlorophenol | 0.001 mg/L
Picloram | 0.5 mg/L
Polychlorinated biphenyls (PCBs) | 0.0005 mg/L
Simazine | 0.004 mg/L
2,3,7,8-TCDD (Dioxin) | 3 X 10-8 mg/L
Toxaphene | 0.003 mg/L
2,4,5-TP (Silvex) | 0.05 mg/L
Contaminant | MCL
Total Trihalomethanes (TTHMs) | 0.080 mg/L
Haloacetic acids (five) (HAA5) | 0.060 mg/L
Bromate | 0.010 mg/L
Chlorite | 1.0 mg/L
Disinfection byproduct | MCLG mg/L
Bromodichloromethane | Zero
Bromoform | Zero
Bromate | Zero
Chlorite | 0.8
Chloroform | 0.07
Dibromochloromethane | 0.06
Dichloroacetic acid | Zero
Monochloroacetic acid | 0.07
Trichloroacetic acid | 0.02
Contaminant | MCL
Benzene | 0.005 mg/L
Carbon Tetrachloride | 0.005 mg/L
1,2-Dichlorobenzene | 0.6 mg/L
1,4-Dichlorobenzene | 0.075 mg/ L
1,2 Dichloroethane | 0.005 mg/L
1,1 Dichloroethylene | 0.007 mg/L
Cis-1,2-Dichloroethylene | 0.07 mg/L
Trans 1,2 Dichloroethylene | 0.1 mg/L
Dichloromethane | 0.005 mg/L
1,2 Dichloropropane | 0.005 mg/L
Ethylbenzene | 0.7 mg/L
Methyl tert Butyl Ether (MTBE) | 0.01 mg/L
Monochlorobenzene | 0.1 mg/L
Styrene | 0.1 mg/L
Tetrachloroethylene1,2,3 | 0.001 mg/L
Toluene | 1 mg/L
1,2,4-Trichlorobenzene | 0.07 mg/L
1,1,1-Trichloroethane | 0.2 mg/L
1,1,2-Tr
ene | 0.007 mg/L
Cis-1,2-Dichloroethylene | 0.07 mg/L
Trans 1,2 Dichloroethylene | 0.1 mg/L
Dichloromethane | 0.005 mg/L
1,2 Dichloropropane | 0.005 mg/L
Ethylbenzene | 0.7 mg/L
Methyl tert Butyl Ether (MTBE) | 0.01 mg/L
Monochlorobenzene | 0.1 mg/L
Styrene | 0.1 mg/L
Tetrachloroethylene1,2,3 | 0.001 mg/L
Toluene | 1 mg/L
1,2,4-Trichlorobenzene | 0.07 mg/L
1,1,1-Trichloroethane | 0.2 mg/L
1,1,2-Trichloroethane | 0.005 mg/L
Trichloroethylene1,2,3 | 0.001 mg/L
Vinyl Chloride1,2,3 | 0.001 mg/L
Xylenes (total) | 10 mg/L
Chemical | gac | pta | ox
Alachlor | X
Atrazine | X
Benzene | X | X
Benzo(a)pyrene | X
Carbofuran | X
Carbon tetrachloride | X | X
Chlordane | X
2,4-D | X
Dalapon | X
Dibromochloropropane (DBCP) | X | X
o-Dichlorobenzene | X | X
1,2-Dichloroethane | X | X
cis-1,2-Dichloroethylene | X | X
trans-1,2-Dichloroethylene | X | X
1,1-Dichloroethylene | X | X
Dichloromethane | X
1,2-Dichloropropane | X | X
Di(2-ethylhexyl)adipate | X | X
Di(2-ethylhexyl)phthalate | X
Dinoseb | X
Diquat | X
Endothall | X
Endrin | X
Ethylene Dibromide (EDB) | X | X
Ethylbenzene | X | X
Glyphosate | X
Heptachlor | X
Heptachlor epoxide | X
Hexachlorobenzene | X
Hexachlorocyclopentadiene | X | X
Lindane | X
Methoxychlor | X
Monochlorobenzene | X | X
Oxamyl (Vydate) | X
para-Dichlorobenzene | X
Polychlorinated biphenyls (PCB) | X
Pentachlorophenol | X
Picloram | X
Simazine | X
Styrene | X
2,4,5-TP (Silvex) | X | X
Tetrachloroethylene | X | X
1,2,4-Trichlorobenzene | X | X
1,1,1-Trichloroethane | X | X
1,1,2-Trichloroethane | X | X
Trichloroethylene | X | X
Toluene | X
Toxaphene | X | X
2,3,7,8-TCDD (Dioxin) | X
Vinyl chloride | X
Xylene | X | X
TTHM | Enhanced coagulation or enhanced softening or GAC10, with chlorine as the primary and residual disinfectant
HAA5 | Enhanced coagulation or enhanced softening or GAC10, with chlorine as the primary and residual disinfectant
Bromate | Control of ozone treatment process to reduce production of bromate
Chlorite | Control of treatment processes to reduce disinfectant demand and control of d
| X
TTHM | Enhanced coagulation or enhanced softening or GAC10, with chlorine as the primary and residual disinfectant
HAA5 | Enhanced coagulation or enhanced softening or GAC10, with chlorine as the primary and residual disinfectant
Bromate | Control of ozone treatment process to reduce production of bromate
Chlorite | Control of treatment processes to reduce disinfectant demand and control of disinfection treatment processes to reduce disinfectant levels
Disinfection Byproduct | Best Available Technology
Total trihalomethanes (TTHM) and Haloacetic acids (five) (HAA5) | Enhanced coagulation or enhanced softening, plus GAC10; or nanofiltration with a molecular weight cutoff ≤1000 Daltons; or GAC20.]
Disinfection Byproduct | Best Available Technology
Total trihalomethanes (TTHM) and Haloacetic acids (five) (HAA5) | Systems serving ≥10,000: Improved distribution system and storage tank management to reduce residence time, plus the use of chloramines for disinfectant residual maintenance Systems serving <10,000: Improved distribution system and storage tank management to reduce residence time
Chemical Name | BAT(s)
Antimony | 2,7
Arsenic 4 | 1,2,5,6,7,9,12 5
Asbestos | 2,3,8
Barium | 5,6,7,9
Beryllium | 1,2,5,6,7
Cadmium | 2,5,6,7
Chromium | 2,5,6 2 ,7
Cyanide | 5,7,10
Mercury | 2 1 ,4,6 1 ,71
Nickel | 5,6,7
Nitrate | 5,7,9
Nitrite | 5,7
Selenium | 1,2 3 ,6,7,9
Thallium | 1,5
Small system compliance technology | Affordable for listed small systems categories 3
Activated Alumina (centralized) | All size categories
Activated Alumina (Point-of-Use) 4 | All size categories
Coagulation/Filtration 5 | 501-3,300, 3,301-10,000
Coagulation-assisted Microfiltration | 501-3,300, 3,301-10,000
Electrodialysis reversal 6 | 501-3,300, 3,301-10,000
Enhanced Coagulation/Filtration | All size categories
Enhanced Lime Softening (pH>10.5) | All size categories
Ion Exchange | All size categories
Lime Softening 5 | 501-3,300, 3,301-10,000
Oxidation/Filtration 7 | All size categories
Reverse Osmosis (centralized) 6 | 501-3,300, 3,301-10,
gulation-assisted Microfiltration | 501-3,300, 3,301-10,000
Electrodialysis reversal 6 | 501-3,300, 3,301-10,000
Enhanced Coagulation/Filtration | All size categories
Enhanced Lime Softening (pH>10.5) | All size categories
Ion Exchange | All size categories
Lime Softening 5 | 501-3,300, 3,301-10,000
Oxidation/Filtration 7 | All size categories
Reverse Osmosis (centralized) 6 | 501-3,300, 3,301-10,000
Reverse Osmosis (Point-of-Use) 4 | All size categories
System Size (No. people served) | No. of sites (Standard monitoring) | No. of sites (Reduced monitoring)
>100,000 | 100 | 50
10,001-100,000 | 60 | 30
3,301-10,000 | 40 | 20
501-3,300 | 20 | 10
101-500 | 10 | 5
<100 | 5 | 5
System Size (No. people served) | First six-month monitoring period begins on
>50,000 | January 1, 1992
3,301-50,000 | July 1, 1992
<3,300 | July 1, 1993
System Size (No. people served) | No. sites for water quality parameters
>100,000 | 25
10,001-100,000 | 10
3,301-10,000 | 3
501-3,300 | 2
101-500 | 1
<100 | 1
System Size (No. people served) | Reduced no. of sites for water quality parameters
>100,000 | 10
10,001-100,000 | 7
3,301-10,000 | 3
501-3,300 | 2
101-500 | 1
<100 | 1
Monitoring | Parameters 2 | Location | Frequency
Initial monitoring | pH, alkalinity, orthophosphate or silica 3 , calcium, conductivity, temperature | Taps and at entry point(s) to the distribution system. | Every 6 months.
After installation of corrosion control | pH, alkalinity, orthophosphate or silica 3 , calcium4. pH, alkalinity, dosage rate and concentration (if alkalinity adjusted as part of corrosion control), inhibitor dosage rate and inhibitor residual 5 . | Taps Entry point(s) to the distribution system 6 . | Every 6 months. No less frequently than every two weeks.
After the Division specifies parameter values for optimal corrosion control. | pH, alkalinity, orthophosphate or silica 3 , calcium 4 . pH, alkalinity, dosage rate and concentration (if alkalinity adjusted as part of corrosion control), inhibitor dosage rate and inhibitor residual 5
5 . | Taps Entry point(s) to the distribution system 6 . | Every 6 months. No less frequently than every two weeks.
After the Division specifies parameter values for optimal corrosion control. | pH, alkalinity, orthophosphate or silica 3 , calcium 4 . pH, alkalinity, dosage rate and concentration (if alkalinity adjusted as part of corrosion control), inhibitor dosage rate and inhibitor residual 5 . | Taps Entry point(s) to the distribution system 6 . | Every 6 months. No less frequently than every two weeks.
Reduced monitoring | pH, alkalinity, orthophosphate or silica 3 , calcium 4 . pH, alkalinity, dosage rate and concentration (if alkalinity adjusted as part of corrosion control), inhibitor dosage rate and inhibitor residual 5 . | Taps Entry point(s) to the distribution system 6 . | Every 6 months, annually 7 or every 3 years 8 ; at reduced number of sites. No less frequently than every two weeks.
Type of system | Minimum monitoring frequency | Sample location in the distribution system
Surface water or ground water under the direct influence of surface water system serving at least 10,000 persons | Four water samples per quarter per treatment plant | At least 25% of all samples collected each quarter at locations representing maximum residence time. Remaining samples taken at locations representative of at least average residence time in the distribution system and representing the entire distribution system, taking into account number of persons served, different sources of water, and different treatment methods. 1
Surface water or ground water under the direct influence of surface water systems serving from 500 to 9,999 persons | One water sample per quarter per treatment plant | Locations representing maximum residence time. 1
Surface water or ground water under the direct influence of surface water system serving fewer than 500 persons | One sample per year per treatment plant during month of warmest water temperature | Location representing maximum residence time 1
face water systems serving from 500 to 9,999 persons | One water sample per quarter per treatment plant | Locations representing maximum residence time. 1
Surface water or ground water under the direct influence of surface water system serving fewer than 500 persons | One sample per year per treatment plant during month of warmest water temperature | Location representing maximum residence time 1 . If the sample (or average of annual samples, if more than one sample is taken) exceeds MCL, system must increase monitoring to one sample per treatment plant per quarter, taken at a point reflecting the maximum residence time in the distribution system, until system meets reduced monitoring criteria in subsection 12.7.1.4.
Systems using only groundwater not under the direct influence of surface water using chemical disinfectant and serving at least 10,000 persons. | One sample per quarter per treatment plant. 2 | Locations representing maximum residence time. 1
Systems using only groundwater not under the direct influence of surface water using chemical disinfectant and serving fewer than 10,000 persons. | One sample per year per treatment plant2 during the month of warmest water temperature. | Locations representing maximum residence time. 1 If the sample (or average of annual samples, if more than one sample is taken) exceeds MCL, system must increase monitoring to one sample per treatment plant per quarter, taken at a point reflecting the maximum residence time in the distribution system, until system meets reduced monitoring criteria in subsection 12.7.1.2.
If you are a… | If you have monitored at least one year and your… | You may reduce monitoring to this level.
Surface water or ground water under the direct influence of surface water system serving at least 10,000 persons which has a source water annual average TOC level, before any treatment, <4.0 mg/L. | TTHM annual average <0.040 mg/L and HAA5 annual average <0.030 mg/L
in subsection 12.7.1.2.
If you are a… | If you have monitored at least one year and your… | You may reduce monitoring to this level.
Surface water or ground water under the direct influence of surface water system serving at least 10,000 persons which has a source water annual average TOC level, before any treatment, <4.0 mg/L. | TTHM annual average <0.040 mg/L and HAA5 annual average <0.030 mg/L. | One sample per treatment plant per quarter at distribution system location reflecting maximum residence time.
Surface water or ground water under the direct influence of surface water system serving from 500 to 9,999 persons which has a source water annual average TOC level, before any treatment, <4.0 mg/L. | TTHM annual average <0.040 mg/L and HAA5 annual average <0.030 mg/L. | One sample per treatment plant per year at distribution system location reflecting maximum residence time during month of warmest water temperature.
Systems using only groundwater not under the direct influence of surface water using chemical disinfectant and serving at least 10,000 persons. | TTHM annual average <0.040 mg/L and HAA5 annual average <0.030 mg/L. | One sample per treatment plant per year at distribution system location reflecting maximum residence time during month of warmest water temperature.
Systems using only groundwater not under the direct influence of surface water using chemical disinfectant and serving fewer than 10,000 persons. | TTHM annual average <0.040 mg/L and HAA5 annual average <0.030 mg/L for two consecutive years or TTHM annual average <0.020 mg/L and HAA5 annual average <0.015 mg/L for one year. | One sample per treatment plant per three year monitoring cycle at distribution system location reflecting maximum residence time during month of warmest water temperature, with the three-year cycle beginning January 1 following the quarter in which the system qualifies for reduced monitoring
wo consecutive years or TTHM annual average <0.020 mg/L and HAA5 annual average <0.015 mg/L for one year. | One sample per treatment plant per three year monitoring cycle at distribution system location reflecting maximum residence time during month of warmest water temperature, with the three-year cycle beginning January 1 following the quarter in which the system qualifies for reduced monitoring.
If you are a… | You must report 1 …
System monitoring for TTHM and HAA5 under the requirements of subsection 12.7 on a quarterly or more frequent basis | 1. The number of samples taken during the last quarter. 2. The location, date, and result of each sample taken during the last quarter. 3. The arithmetic average of all samples taken in the last quarter. 4. The annual arithmetic average of the quarterly arithmetic averages of this section for the last four quarters. 5. Whether, based on subsection 12.15.1, the MCL was violated.
System monitoring for TTHMs and HAA5 under the requirements of subsection 12.7 less frequently than quarterly (but at least annually). | 1. The number of samples taken during the last year. 2. The location, date, and result of each sample taken during the last monitoring period. 3. The arithmetic average of all samples taken over the last year. 4. Whether, based on subsection 12.15.1, the MCL was violated.
System monitoring for TTHMs and HAA5 under the requirements of subsection 12.7 less frequently than annually. | 1. The location, date, and result of the last sample taken. 2. Whether, based on subsection 12.15.1, the MCL was violated.
System monitoring for chlorite under the requirements of subsection 12.7. | 1. The number of entry point samples taken each month for the last three months. 2. The location, date, and result of each sample (both entry point and distribution system) taken during the last quarter. 3. For each month in the reporting period, the arithmetic average of all samples taken in each three samples set taken in the distribution system. 4
te under the requirements of subsection 12.7. | 1. The number of entry point samples taken each month for the last three months. 2. The location, date, and result of each sample (both entry point and distribution system) taken during the last quarter. 3. For each month in the reporting period, the arithmetic average of all samples taken in each three samples set taken in the distribution system. 4. Whether, based on subsection 12.15.3, the MCL was violated, and how many times it was violated each month.
System monitoring for bromate under the requirements of subsection 12.7. | 1. The number of samples taken during the last quarter. 2. The location, date, and result of each sample taken during the last quarter. 3. The arithmetic average of the monthly arithmetic averages of all samples taken in the last year. 4. Whether, based on subsection 12.15.2 the MCL was violated.
If you are a… | You must report 1 …
System monitoring for chlorine or chloramines under the requirements of subsection 12.8. | 1. The number of samples taken during each month of the last quarter. 2. The monthly arithmetic average of all samples taken in each month for the last 12 months. 3. The arithmetic average of all monthly averages for the last 12 months. 4. Whether, based on subsection 1.19.3.1, the MRDL was violated.
System monitoring for chlorine dioxide under the requirements of subsection 12.8. | 1. The dates, results, and locations of samples taken during the last quarter. 2. Whether, based on subsection 1.19.3.1, the MRDL was violated. 3. Whether the MRDL was exceeded in any two consecutive daily samples and whether the resulting violation was acute or non-acute.
If you are a… | You must report 1 …
System monitoring monthly or quarterly for TOC under the requirements of subsection 12.9 and required to meet the enhanced coagulation or enhanced softening requirements in subsections 12.16.2.2 or 12.16.2.3. | 1. The number of paired (source water and treated water, prior to continuous disinfection) samples taken during the last quarter
was acute or non-acute.
If you are a… | You must report 1 …
System monitoring monthly or quarterly for TOC under the requirements of subsection 12.9 and required to meet the enhanced coagulation or enhanced softening requirements in subsections 12.16.2.2 or 12.16.2.3. | 1. The number of paired (source water and treated water, prior to continuous disinfection) samples taken during the last quarter. 2. The location, date, and result of each paired sample and associated alkalinity taken during the last quarter. 3. For each month in the reporting period that paired sample were taken, the arithmetic average of the percent reduction of TOC for each paired sample and the required TOC percent removal. 4. Calculations for determining compliance with the TOC percent removal requirements, as provided in subsection 12.16.3.1. 5. Whether the system is in compliance with the enhanced coagulation or enhanced softening percent removal requirements in subsection 12.16.2 for the last four quarters.
System monitoring monthly or quarterly for TOC under the requirements of subsection 12.9 and meeting one or more of the alternative compliance criteria in subsections 12.16.1.2 or 12.16.1.3. | 1. The alternative compliance criterion that the system is using. 2. The number of paired (source water and treated water, prior to continuous disinfection) samples taken during the last quarter. 3. The location, date, and result of each paired sample and associated alkalinity taken during the last quarter. 4. The running annual arithmetic average based on monthly averages (or quarterly samples) of source water TOC for systems meeting a criterion in subsections 12.16.1.2.1 or 12.16.1.2.3 or of treated water TOC for systems meeting the criterion in subsection 12.16.1.2.2. 5. The running annual arithmetic average based on monthly averages (or quarterly samples) of source water SUVA for systems meeting the criterion in subsection 12.7.1.2.5 or of treated water SUVA for systems meeting the criterion in subsection 12.16.1.2.6. 6
ing a criterion in subsections 12.16.1.2.1 or 12.16.1.2.3 or of treated water TOC for systems meeting the criterion in subsection 12.16.1.2.2. 5. The running annual arithmetic average based on monthly averages (or quarterly samples) of source water SUVA for systems meeting the criterion in subsection 12.7.1.2.5 or of treated water SUVA for systems meeting the criterion in subsection 12.16.1.2.6. 6. The running annual average of source water alkalinity for systems meeting the criterion in subsection 12.16.1.2.3 and of treated water alkalinity for systems meeting the criterion in subsection 12.16.1.3.1. 7. The running annual average for both TTHM and HAA5 for systems meeting the criterion in subsection 12.16.1.2.3 or 12.16.1.2.4. 8. The running annual average of the amount of magnesium hardness removal (as CaCO3, in mg/L) for systems meeting the criterion in subsection 12.16.1.3.2. 9. Whether the system is in compliance with the particular alternative compliance criterion in subsections 12.16.1.2 or 12.16.1.3.
Source Water TOC | Source water alkalinity, mg/L as CaCO 3 (in percentages)
0-60 | >60-120 | >1203
>2.0 –4.0 | 35.0 | 25.0 | 15.0
>4.0 –8.0 | 45.0 | 35.0 | 25.0
>8.0 | 50.0 | 40.0 | 30.0
Alkalinity (mg/L as CaCO3) | Target pH
0 – 60 | 5.5
>60 – 120 | 6.3
>120 – 240 | 7.0
>240 | 7.5
If you serve this population | You must submit your standard monitoring plan or system specific study plan 1 or 40/30 certification 2 to the Division by or receive very small system waiver from the Division | You must complete your standard monitoring or system specific study by | You must submit your IDSE report to the Division by 3
Systems that are not part of a combined distribution system and systems that serve the largest population in the combined distribution system
or system specific study plan 1 or 40/30 certification 2 to the Division by or receive very small system waiver from the Division | You must complete your standard monitoring or system specific study by | You must submit your IDSE report to the Division by 3
Systems that are not part of a combined distribution system and systems that serve the largest population in the combined distribution system
(i) >100,000 | October 1, 2006 | September 30, 2008 | January 1, 2009
(ii) 50,000-99,999 | April 1, 2007 | March 31, 2009 | July 1, 2009
(iii) 10,000-49,999 | October 1, 2007 | September 30, 2009 | January 1, 2010
(iv) <10,000 (CWS only) | April 1, 2008 | March 31, 2010 | July 1, 2010
Other systems that are part of a combined distribution system
(v) Wholesale system or consecutive system | At the same time as the system with the earliest compliance date in the combined distribution system. | At the same time as the system with the earliest compliance date in the combined distribution system. | At the same time as the system with the earliest compliance date in the combined distribution system.
Source Water Type | Population Size Category | Monitoring periods and frequency of sampling | Distribution system monitoring locations 1
Total per monitoring period | Near entry points | Average residence time | High TTHM locations | High HAA5 locations
Surface water or ground water under the direct influence of surface water | <500 consecutive systems | One (during peak historical month) 2 | 2 | 1 | ………… | 1
<500 non-consecutive systems | …………… | 2 | ………… | ………… | 1 | 1
500-3,300 consecutive systems | Four (every 90 days) | 2 | 1 | …………… | 1
500-3,300 non-consecutive systems | ………… | 2 | ………… | ………… | 1 | 1
3,301-9,999 | ………… | 4 | ………… | 1 | 2 | 1
10,000-49,999 | Six (every 60 days) | 8 | 1 | 2 | 3 | 2
50,000-249,999 | ………… | 16 | 3 | 4 | 5 | 4
250,000-999,999 | ………… | 24 | 4 | 6 | 8 | 6
1,000,000-4,999,999 | ………… | 32 | 6 | 8 | 10 | 8
≥5,000,000 | ………… | 40 | 8 | 10 | 12 | 10
Ground Water | <500 consecutive systems | One (durin
| 1
500-3,300 non-consecutive systems | ………… | 2 | ………… | ………… | 1 | 1
3,301-9,999 | ………… | 4 | ………… | 1 | 2 | 1
10,000-49,999 | Six (every 60 days) | 8 | 1 | 2 | 3 | 2
50,000-249,999 | ………… | 16 | 3 | 4 | 5 | 4
250,000-999,999 | ………… | 24 | 4 | 6 | 8 | 6
1,000,000-4,999,999 | ………… | 32 | 6 | 8 | 10 | 8
≥5,000,000 | ………… | 40 | 8 | 10 | 12 | 10
Ground Water | <500 consecutive systems | One (during peak historical month) 2 | 2 | 1 | ………… | 1
<500 non-consecutive systems | …………… | 2 | ………… | ………… | 1 | 1
500-9,999 | Four (every 90 days) | 2 | ………… | …………. | 1 | 1
10,000-99,999 | ………… | 6 | 1 | 1 | 2 | 2
100,000-499,999 | ………… | 8 | 1 | 1 | 3 | 3
≥500,000 | ………… | 12 | 2 | 2 | 4 | 4
System Type | Population size category | Number of monitoring locations | Number of samples
TTHM | HAA5
Surface water or ground water under the direct influence of surface water | <500 | 3 | 3 | 3
500-3,300 | 3 | 9 | 9
3,301-9,999 | 6 | 36 | 36
10,000-49,999 | 12 | 72 | 72
50,000-249,999 | 24 | 144 | 144
250,000-999,999 | 36 | 216 | 216
1,000,000-4,999,999 | 48 | 288 | 288
≥5,000,000 | 60 | 360 | 360
Ground Water | <500 | 3 | 3 | 3
500-9,999 | 3 | 9 | 9
10,000-99,999 | 12 | 48 | 48
100,000-499,999 | 18 | 72 | 72
≥500,000 | 24 | 96 | 96
If your 40/30 certification is due | Then your eligibility for 40/30 certification is based on eight consecutive calendar quarters of compliance monitoring results under subsection 12.7 beginning no earlier than 1
(1) October 1, 2006 | January 2004
(2) April 1, 2007 | January 2004
(3) October 1, 2007 | January 2005
10,000-99,999 | 12 | 48 | 48
100,000-499,999 | 18 | 72 | 72
≥500,000 | 24 | 96 | 96
If your 40/30 certification is due | Then your eligibility for 40/30 certification is based on eight consecutive calendar quarters of compliance monitoring results under subsection 12.7 beginning no earlier than 1
(1) October 1, 2006 | January 2004
(2) April 1, 2007 | January 2004
(3) October 1, 2007 | January 2005
(4) April 1, 2008 | January 2005
Source water type | Population size category | Monitoring frequency 1 | Distribution system monitoring location
Total per monitoring period 2 | Highest TTHM locations | Highest HAA5 locations | Existing subsection 12.6 compliance locations
Surface water or ground water under the direct influence of surface water | <500 | Per year | 2 | 1 | 1 | …………
500-3,300 | Per quarter | 2 | 1 | 1
3,301-9,999 | Per quarter | 2 | 1 | 1 | …………
10,000-49,999 | Per quarter | 4 | 2 | 1 | 1
50,000-249,999 | Per quarter | 8 | 3 | 3 | 2
250,000- 999,999 | Per quarter | 12 | 5 | 4 | 3
1,000,000- 4,999,999 | Per quarter | 16 | 6 | 6 | 4
≥5,000,000 | Per quarter | 20 | 8 | 7 | 5
Ground water
<500 | Per year | 2 | 1 | 1
500-9,999 | Per year | 2 | 1 | 1
10,000-99,999 | Per quarter | 4 | 2 | 1 | 1
100,000-499,999 | Per quarter | 6 | 3 | 2 | 1
≥500,000 | Per quarter | 8 | 3 | 3 | 2
If you are this type of system | You must comply with 14.0 monitoring by: 1
Systems that are not part of a combined distribution system that serve the largest population in the combined distribution system
14.1.3.1 System serving ≥100,000 | April 1, 2012
14.1.3.2 System Serving 50,000 – 99,999 | October 1, 2012
14.1.3.3 System serving 10,000 – 49,999 | October 1, 2013
14.1.3.4 System serving <10,000 | October 1, 2013 if no Cryptosporidium monitoring is required under subsection 20.2.1.4 or October 1, 2014 if Cryptosporidium monitoring is required under subsections 20.2.1.4 or 20.2.1.6
Other systems that are part of a combined distribution system
14.1.3.5 Consecutive system or wholesale system | At the same time as the system with the earl
,999 | October 1, 2013
14.1.3.4 System serving <10,000 | October 1, 2013 if no Cryptosporidium monitoring is required under subsection 20.2.1.4 or October 1, 2014 if Cryptosporidium monitoring is required under subsections 20.2.1.4 or 20.2.1.6
Other systems that are part of a combined distribution system
14.1.3.5 Consecutive system or wholesale system | At the same time as the system with the earliest compliance date in the combined distribution system.
Source water type | Population size category | Monitoring frequency 1 | Distribution system monitoring location total per monitoring period 2
Surface water or ground water under the direct influence of surface water:
<500 | Per year | 2
500-3,300 | Per quarter | 2
3,301-9,999 | Per quarter | 2
10,000-49,999 | Per quarter | 4
50,000-249,999 | Per quarter | 8
250,000- 999,999 | Per quarter | 12
1,000,000- 4,999,999 | Per quarter | 16
≥5,000,000 | Per quarter | 20
Ground water:
<500 | Per year | 2
500-9,999 | Per year | 2
10,000-99,999 | Per quarter | 4
100,000-499,999 | Per quarter | 6
≥500,000 | Per quarter | 8
Source water type | Population size category | Monitoring frequency 1 | Distribution system monitoring location per monitoring period
Surface water or ground water under the direct influence of surface water:
<500 | Per year | Monitoring may not be reduced
500-3,300 | Per year | 1 TTHM and 1 HAA5 sample: one at the location and during the quarter with the highest TTHM single measurement, one at the location and during the quarter with the highest HAA5 single measurement; 1 dual sample set per year if the highest TTHM and HAA5 measurements occurred at the same location and quarter.
3,301-9,999 | Per quarter | 2 dual sample sets: one at the location and during the quarter with the highest TTHM single measurement, one at the location and during the quarter with the highest HAA5 single measurement.
10,000-49,999 | Per quarter | 2 dual sample sets at the locations with the highest TTHM and highest HAA5 LRAAs
t TTHM and HAA5 measurements occurred at the same location and quarter.
3,301-9,999 | Per quarter | 2 dual sample sets: one at the location and during the quarter with the highest TTHM single measurement, one at the location and during the quarter with the highest HAA5 single measurement.
10,000-49,999 | Per quarter | 2 dual sample sets at the locations with the highest TTHM and highest HAA5 LRAAs.
50,000-249,999 | Per quarter | 4 dual sample sets - at the locations with the two highest TTHM and two highest HAA5 LRAAs.
250,000- 999,999 | Per quarter | 6 dual sample sets - at the locations with the three highest TTHM and three highest HAA5 LRAAs.
1,000,000- 4,999,999 | Per quarter | 8 dual sample sets - at the locations with the four highest TTHM and four highest HAA5 LRAAs.
≥5,000,000 | Per quarter | 10 dual sample sets - at the locations with the five highest TTHM and five highest HAA5 LRAAs.
Ground water:
<500 | Every third year | 1 TTHM and 1 HAA5 sample: one at the location and during the quarter with the highest TTHM single measurement, one at the location and during the quarter with the highest HAA5 single measurement; 1 dual sample set per year if the highest TTHM and HAA5 measurements occurred at the same location and quarter.
500-9,999 | Per year | 1 TTHM and 1 HAA5 sample: one at the location and during the quarter with the highest TTHM single measurement, one at the location and during the quarter with the highest HAA5 single measurement; 1 dual sample set per year if the highest TTHM and HAA5 measurements occurred at the same location and quarter.
10,000-99,999 | Per year | 2 dual sample sets: one at the location and during the quarter with the highest TTHM single measurement, one at the location and during the quarter with the highest HAA5 single measurement.
100,000-499,999 | Per quarter | 2 dual sample sets at the locations with the highest TTHM and highest HAA5 LRAAs.
≥500,000 | Per quarter | 4 dual sample sets - at the locations with the two highest TTHM and two highest HAA5 LRAAs
one at the location and during the quarter with the highest TTHM single measurement, one at the location and during the quarter with the highest HAA5 single measurement.
100,000-499,999 | Per quarter | 2 dual sample sets at the locations with the highest TTHM and highest HAA5 LRAAs.
≥500,000 | Per quarter | 4 dual sample sets - at the locations with the two highest TTHM and two highest HAA5 LRAAs.
Radionuclide | Critical Organ | pCi/L
Tritium | Total Body | 20,000
Strontium | Bone Marrow | 8
Contaminant | BAT
Combined radium-226 and -228 | Ion exchange, reverse osmosis, lime softening
Uranium | Ion exchange, reverse osmosis, lime softening, coagulation/filtration
Gross alpha particle activity (excluding radon and uranium) | Reverse osmosis
Beta particle and photon radioactivity | Ion exchange, reverse osmosis
Unit Technologies | Limitations (see footnotes) | Operator Skill Level Required 1 | Raw Water Quality Range and Considerations
1. Ion Exchange (IE) | a | Intermediate | All ground waters
2. Point-of-Use (POU 2 )IE | b | Basic | All ground waters
3. Reverse Osmosis (RO) | c | Advanced | Surface waters usually require pre-filtration
4. POU2 RO | b | Basic | Surface waters usually require pre-filtration
5. Lime softening | d | Advanced | All waters
6. Greensand filtration | e | Basic
7. Co-precipitation with barium sulfate | f | Intermediate to advanced | Ground waters with suitable water quality
8. Electrodialysis/Electrodialysis reversal | Basic to intermediate | All ground waters
9. Pre-formed hydrous manganese oxide filtration | g | Intermediate | All ground waters
10. Activated alumina | a, h | Advanced | All ground waters; competing anion concentrations may affect regeneration frequency
11
with barium sulfate | f | Intermediate to advanced | Ground waters with suitable water quality
8. Electrodialysis/Electrodialysis reversal | Basic to intermediate | All ground waters
9. Pre-formed hydrous manganese oxide filtration | g | Intermediate | All ground waters
10. Activated alumina | a, h | Advanced | All ground waters; competing anion concentrations may affect regeneration frequency
11. Enhanced coagulation/filtration | i | Advanced | Can treat a wide range of water qualities
Contaminant | Compliance technologies 1 for system size categories (population served) | 3,301-10,000
25-500 | 501-3,300
Combined radium-226 and radium-228 | 1,2,3,4,5,6,7,8,9 | 1,2,3,4,5,6,7,8,9 | 1,2,3,4,5,6,7,8,9
Gross alpha particle activity | 3,4 | 3,4 | 3,4
Beta particle and photon radioactivity | 1,2,3,4 | 1,2,3,4 | 1,2,3,4
Uranium | 1,2,4,10,11 | 1,2,3,4,5,10,11 | 1,2,3,4,5,10,11
Contaminant | Detection Limit
Gross alpha particle activity | 3 pCi/L
Radium 226 | 1 pCi/L
Radium 228 | 1 pCi/L
Uranium | 1ug/L
Radionuclide | Detection Limit
Tritium | 1,000 pCi/L
Strontium-89 | 10 pCi/L
Strontium-90 | 2 pCi/L
Iodine-131 | 1 pCi/L
Cesium-134 | 10 pCi/L
Gross beta | 4 pCi/L
Other radionuclides | 1/10 of the applicable limit
System Population | Samples/Day*
<500 501-1,000 1,001-2,500 2,501-3,300 | 1 2 3 4
Systems that serve | Must begin the first round of source water monitoring no later than the month beginning... | And must begin the second round of source water monitoring no later than the month beginning ...
At least 100,000 people | October 1, 2006 | April 1, 2015
From 50,000 to 99,999 people | April 1, 2007 | October 1, 2015
From 10,000 to 49,999 people | April 1, 2008 | October 1, 2016
Fewer than 10,000 and monitor for E
n the first round of source water monitoring no later than the month beginning... | And must begin the second round of source water monitoring no later than the month beginning ...
At least 100,000 people | October 1, 2006 | April 1, 2015
From 50,000 to 99,999 people | April 1, 2007 | October 1, 2015
From 10,000 to 49,999 people | April 1, 2008 | October 1, 2016
Fewer than 10,000 and monitor for E. coli 1 | October 1, 2008 | October 1, 2017
Fewer than 10,000 and monitor for Cryptosporidium 2 | April 1, 2010 | April 1, 2019
For systems that are: | With a Cryptosporidium bin concentration of… 1 | The bin classification is…
…required to monitor for Cryptosporidium under subsection 20.2 | Cryptosporidium <0.075 oocyst/L. 0.075 oocysts/L Cryptosporidium < 1.0 oocysts/L. 1.0 oocysts/L Cryptosporidium <3.0 oocysts/L Cryptosporidium ≥3.0 oocysts/L | Bin 1. Bin 2. Bin 3. Bin 4.
…serving fewer than 10,000 people and NOT required to monitor for Cryptosporidium under subsection 20.2.1.4 | N/A | Bin 1.
If the system bin classification is… | And the system uses the following filtration treatment in full compliance with Sections 16.0, 17.0 and 19.0 (as applicable), then the additional Cryptosporidium treatment requirements are…
Conventional filtration treatment (including softening) | Direct filtration | Slow sand or diatomaceous earth filtration | Alternative filtration technologies
Bin 1… | No additional treatment… | No additional treatment… | No additional treatment… | No additional Treatment
Bin 2… | 1-log treatment… | 1.5-log treatment… | 1-log treatment… | ( 1 )
Bin 3… | 2-log treatment… | 2.5-log treatment… | 2-log treatment… | ( 2 )
Bin 4… | 2.5-log treatment… | 3-log treatment… | 2.5-log treatment… | ( 3 )
Systems that serve… | Must comply with Cryptosporidium treatment requirements no later than… 1
(1) at least 100,000 people | (i) April 1, 2012
(2) From 50,000 to 99,999 people | (i) October 1, 2012
(3) From 10,000 to 49,999 people | (i) October 1, 2013
n 3… | 2-log treatment… | 2.5-log treatment… | 2-log treatment… | ( 2 )
Bin 4… | 2.5-log treatment… | 3-log treatment… | 2.5-log treatment… | ( 3 )
Systems that serve… | Must comply with Cryptosporidium treatment requirements no later than… 1
(1) at least 100,000 people | (i) April 1, 2012
(2) From 50,000 to 99,999 people | (i) October 1, 2012
(3) From 10,000 to 49,999 people | (i) October 1, 2013
(4) Fewer than 10,000 people | (i) October 1, 2014
Toolbox Option | Cryptosporidium Treatment credit with design and implementation criteria
Source Protection and Management Toolbox Options
(1) Watershed control program | 0.5-log credit for Division-approved program comprising required elements, annual program status report to Division, and regular watershed survey. Unfiltered systems are not eligible for credit. Specific criteria are in subsection 20.17.1.
(2) Alternative source/intake management | No prescribed credit. Systems may conduct simultaneous monitoring for treatment bin classification at alternative intake locations or under alternative intake management strategies. Specific criteria are in subsection 20.17.2.
Pre-Filtration Toolbox Options
(3) Presedimentation basin with coagulation | 0.5-log credit during any month that presedimentation basins achieve a monthly mean reduction of 0.5-log or greater in turbidity or alternative Division-approved performance criteria. To be eligible, basins must be operated continuously with coagulant addition and all plant flow must pass through the basins. Specific criteria are in subsection 20.18.1.
(4) Two-stage lime softening | 0.5-log credit for two-stage softening where chemical addition and hardness precipitation occur in both stages. All plant flow must pass through both stages. Single-stage softening is credited as equivalent to conventional treatment. Specific criteria are in subsection 20.18.2.
all plant flow must pass through the basins. Specific criteria are in subsection 20.18.1.
(4) Two-stage lime softening | 0.5-log credit for two-stage softening where chemical addition and hardness precipitation occur in both stages. All plant flow must pass through both stages. Single-stage softening is credited as equivalent to conventional treatment. Specific criteria are in subsection 20.18.2.
(5) Bank filtration | 0.5-log credit for 25-foot setback; 1.0-log credit for 50-foot setback; aquifer must be unconsolidated sand containing at least 10 percent fines; average turbidity in wells must be less than 1 NTU. Systems using wells followed by filtration when conducting source water monitoring must sample the well to determine bin classification and are not eligible for additional credit. Specific criteria are in subsection 20.18.3.
Treatment Performance Toolbox Options
(6) Combined filter performance | 0.5-log credit for combined filter effluent turbidity less than or equal to 0.15 NTU in at least 95 percent of measurements each month. Specific criteria are in subsection 20.19.1.
(7) Individual filter performance | 0.5-log credit (in addition to 0.5-log combined filter performance credit) if individual filter effluent turbidity is less than or equal to 0.15 NTU in at least 95 percent of samples each month in each filter and is never greater than 0.3 NTU in two consecutive measurements in any filter. Specific criteria are in subsection 20.19.2.
(8) Demonstration of performance | Credit awarded to unit process or treatment train based on a demonstration to the Division with a Division-approved protocol. Specific criteria are in subsection 20.19.3.
Additional Filtration Toolbox Options
(9) Bag or cartridge filters (individual filters) | Up to 2-log credit based on the removal efficiency demonstrated during challenge testing with a 1-log factor of safety. Specific criteria are in subsection 20.20.1.
ocess or treatment train based on a demonstration to the Division with a Division-approved protocol. Specific criteria are in subsection 20.19.3.
Additional Filtration Toolbox Options
(9) Bag or cartridge filters (individual filters) | Up to 2-log credit based on the removal efficiency demonstrated during challenge testing with a 1-log factor of safety. Specific criteria are in subsection 20.20.1.
(10) Bag or cartridge filter (in series) | Up to 2.5-log credit based on the removal efficiency demonstrated during challenge testing with a 0.5-log factor of safety. Specific criteria are in subsection 20.20.1.
(11) Membrane filtration | Log credit equivalent to removal efficiency demonstrated in challenge test for device if supported by direct integrity testing. Specific criteria are in subsection 20.20.2.
(12) Second stage filtration | 0.5-log credit for second separate granular media filtration stage if treatment train includes coagulation prior to first filter. Specific criteria are in subsection 20.20.3.
(13) Slow sand filters | 2.5-log credit as a secondary filtration step; 3.0-log credit as a primary filtration process. No prior chlorination for either option. Specific criteria are in subsection 20.20.4.
Inactivation Toolbox Options
(14) Chlorine dioxide | Log credit based on measured CT in relation to CT table. Specific criteria are in subsection 20.21.2.
(15) Ozone | Log credit based on measured CT in relation to CT table. Specific criteria are in subsection 20.21.2.
(16) UV | Log credit based on validated UV dose in relation to UV dose table; reactor validation testing required to establish UV dose and associated operating conditions. Specific criteria are in subsection 20.21.4.
Log credit | Water Temperature, o C
≤0.5 | 1 | 2 | 3 | 5 | 7 | 10 | 15 | 20 | 25 | 30
credit based on measured CT in relation to CT table. Specific criteria are in subsection 20.21.2.
(16) UV | Log credit based on validated UV dose in relation to UV dose table; reactor validation testing required to establish UV dose and associated operating conditions. Specific criteria are in subsection 20.21.4.
Log credit | Water Temperature, o C
≤0.5 | 1 | 2 | 3 | 5 | 7 | 10 | 15 | 20 | 25 | 30
(i) 0.25 | 159 | 153 | 140 | 128 | 107 | 90 | 69 | 45 | 29 | 19 | 12
(ii) 0.5 | 319 | 305 | 279 | 256 | 214 | 180 | 138 | 89 | 58 | 38 | 24
(iii) 1.0 | 637 | 610 | 558 | 511 | 429 | 360 | 277 | 179 | 116 | 75 | 49
(iv) 1.5 | 956 | 915 | 838 | 767 | 643 | 539 | 415 | 268 | 174 | 113 | 73
(v) 2.0 | 1275 | 1220 | 1117 | 1023 | 858 | 719 | 553 | 357 | 232 | 150 | 98
(vi) 2.5 | 1594 | 1525 | 1396 | 1278 | 1072 | 899 | 691 | 447 | 289 | 188 | 122
(vii) 3.0 | 1912 | 1830 | 1675 | 1534 | 1286 | 1079 | 830 | 536 | 347 | 226 | 147
Log credit | Water Temperature, o C
≤0.5 | 1 | 2 | 3 | 5 | 7 | 10 | 15 | 20 | 25 | 30
(i) 0.25 | 6.0 | 5.8 | 5.2 | 4.8 | 4.0 | 3.3 | 2.5 | 1.6 | 1.0 | 0.6 | 0.39
(ii) 0.5 | 12 | 12 | 10 | 9.5 | 7.9 | 6.5 | 4.9 | 3.1 | 2.0 | 1.2 | 0.78
(iii) 1.0 | 24 | 23 | 21 | 19 | 16 | 13 | 9.9 | 6.2 | 3.9 | 2.5 | 1.6
(iv) 1.5 | 36 | 35 | 31 | 29 | 24 | 20 | 15 | 9.3 | 5.9 | 3.7 | 2.4
(v) 2.0 | 48 | 46 | 42 | 38 | 32 | 26 | 20 | 12 | 7.8 | 4.9 | 3.1
(vi) 2.5 | 60 | 58 | 52 | 48 | 40 | 33 | 25 | 16 | 9.8 | 6.2 | 3.9
(vii) 3.0 | 72 | 69 | 63 | 57 | 47 | 39 | 30 | 19 | 12 | 7.4 | 4.7
Log credit | Cryptosporidium UV dose (mJ/cm2) | Giardia lamblia UV dose (mJ/cm2) | Virus UV dose (mJ/cm2)
(i) 0.5 | 1.6 | 1.5 | 39
(ii) 1.0 | 2.5 | 2.1 | 58
(iii) 1.5 | 3.9 | 3.0 | 79
(iv) 2.0 | 5.8 | 5.2 | 100
48 | 46 | 42 | 38 | 32 | 26 | 20 | 12 | 7.8 | 4.9 | 3.1
(vi) 2.5 | 60 | 58 | 52 | 48 | 40 | 33 | 25 | 16 | 9.8 | 6.2 | 3.9
(vii) 3.0 | 72 | 69 | 63 | 57 | 47 | 39 | 30 | 19 | 12 | 7.4 | 4.7
Log credit | Cryptosporidium UV dose (mJ/cm2) | Giardia lamblia UV dose (mJ/cm2) | Virus UV dose (mJ/cm2)
(i) 0.5 | 1.6 | 1.5 | 39
(ii) 1.0 | 2.5 | 2.1 | 58
(iii) 1.5 | 3.9 | 3.0 | 79
(iv) 2.0 | 5.8 | 5.2 | 100
(v) 2.5 | 8.5 | 7.7 | 121
(vi) 3.0 | 12 | 11 | 143
(vii) 3.5 | 15 | 15 | 163
(viii) 4.0 | 22 | 22 | 186
Toolbox option | Systems must submit the following information | On the following schedule
(1) Watershed control program (WCP) | (1) Notice of intention to develop a new or continue an existing watershed control program. | No later than two years before the application treatment compliance date in subsection 20.14.
(2) Watershed control plan | No later than one year before the application compliance date in subsection 20.14.
(3) Annual watershed control program status report | Every 12 months, beginning one year after the applicable treatment compliance date in subsection 20.14.
(4) Watershed sanitary survey report | For community water systems, every three years beginning thre

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/STATE_DE_ADC_T16_4462. Check the current official text before relying on it. Not legal advice.