Section 620.410 Groundwater Quality Standards for Class I: Potable Resource Groundwater

Section 620

TITLE 35: ENVIRONMENTAL PROTECTION

SUBTITLE F: PUBLIC WATER SUPPLIES

CHAPTER I: POLLUTION CONTROL BOARD

PART 620 GROUNDWATER QUALITY

SECTION 620.410 GROUNDWATER QUALITY STANDARDS FOR CLASS I: POTABLE RESOURCE GROUNDWATER

Section 620.410  Groundwater

Quality Standards for Class I:  Potable Resource Groundwater

a)         Inorganic Chemical Constituents

Except due to

natural causes or as provided in Section 620.450, concentrations of the

following chemical constituents must not be exceeded in Class I groundwater:

CASRN

Constituent

Standar

d

(mg/L)

a,b

7429-90-5

Aluminum

l.9

c

7440-36-0

Antimony

0.006

d

7440-38-2

Arsenic

e

0.01

d

7440-39-3

Barium

2.0

d

7440-41-7

Beryllium

0.004

d

7440-42-8

Boron

2.0

f

7440-43-9

Cadmium

0.005

d

16887-00-6

Chloride

200

g

7440-47-3

Chromium (total)

0.l

d

7440-48-4

Cobalt

0.0012

c

7440-50-8

Copper

0.5

h

143-33-9

Cyanide

0.2

d

7681-49-4

Fluoride

4

d

7439-89-6

Iron

5

g

7439-92-1

Lead

0.0075

i

7439-93-2

Lithium

0.04

j

7439-96-5

Manganese

0.l5

k

7487-94-7

Mercury (mercuric chloride)

0.002

d

7439-98-7

Molybdenum

0.308

c

7440-02-0

Nickel

0.077

c

14797-55-8

Nitrate as N

10

d

14797-73-0

Perchlorate

0.0081

c

7440-14-4

Radium (combined 226+228)

5

d

7782-49-2

Selenium

0.02

f

7440-22-4

Silver

0.058

c

14808-79-8

Sulfate

400

g

TDS (total dissolved solids)

1,200

g

7440-28-0

Thallium

0.002

d

7440-62-2

Vanadium

0.00027

c

7440-66-6

Zinc

l.2

c

Constituent Name and Groundwater

Quality Standard Notations

a

The

standard unit for radium (combined 226+228) is picocuries per liter (pCi/L).

b

The

inorganic groundwater quality standards are based on total metal analyses for

the evaluation of human health effects.

c

The

standard is calculated using the Human Threshold Toxicant Advisory

Concentration (HTTAC) procedures at Appendix A.

d

The

standard is based on the Maximum Contaminant Level (MCL), promulgated by USEPA,

Office of Water, and Illinois Primary Drinking Water Standards specified in 35

Ill. Adm. Code 611

y standards are based on total metal analyses for

the evaluation of human health effects.

c

The

standard is calculated using the Human Threshold Toxicant Advisory

Concentration (HTTAC) procedures at Appendix A.

d

The

standard is based on the Maximum Contaminant Level (MCL), promulgated by USEPA,

Office of Water, and Illinois Primary Drinking Water Standards specified in 35

Ill. Adm. Code 611.

e

The

constituent meets the definition of a "carcinogen" in Section

620.110.

f

The

standard is based on beneficial use for irrigation of crops, per "Water

Quality Criteria", by National Academy of Sciences, incorporated by

reference in Section 620.125.

g

The

standard is the 95% confidence concentration stated in the Agency's "Integrated

Water Quality Report and Section 303(d) List", incorporated by reference in

Section 620.125.

h

The

standard is based on beneficial use for watering livestock, per "Water

Quality Criteria", by National Academy of Sciences, incorporated by

reference in Section 620.125.

i

The

standard is 50% of the USEPA "action level" of 0.015 mg/L for lead.

The USEPA action level applies at the service connection.  The standard is

reduced by 50% as a safety margin, based on the assumption that 50% of water

would be treated.

j

The

standard is the "LLOQ" or "LCMRL" as defined in Section

620.110.

k

The standard is promulgated at 35 Ill. Adm. Code 611.300.

b)         Organic Chemical Constituents

Except due to

natural causes or as provided in Section 620.450 or subsection (c) of this

Section, concentrations of the following organic chemical constituents must not

be exceeded in Class I groundwater:

CASRN

Constituent

Standard (mg/L)

83-32-9

Acenaphthene

0.23

a

67-64-1

Acetone

3.5

a

15972-60-8

Alachlor

b

0.002

c

116-06-3

Aldicarb

0.003

c

120-12-7

Anthracene

1.2

a

319-84-6

alpha-

BHC

(

alpha-

benzene

hexachloride)

b

0.000012

d

71-43-2

Benzene

b

0.005

c

56-55-3

Benzo(a)anthracene

e

0.00025

d

205-99-2

Benzo(b)fluoranthene

e

0.00025

d

207-08-9

Benzo(k)fluoranthene

e

0.0025

d

50-32-8

Benzo(a)py

r:

CASRN

Constituent

Standard (mg/L)

83-32-9

Acenaphthene

0.23

a

67-64-1

Acetone

3.5

a

15972-60-8

Alachlor

b

0.002

c

116-06-3

Aldicarb

0.003

c

120-12-7

Anthracene

1.2

a

319-84-6

alpha-

BHC

(

alpha-

benzene

hexachloride)

b

0.000012

d

71-43-2

Benzene

b

0.005

c

56-55-3

Benzo(a)anthracene

e

0.00025

d

205-99-2

Benzo(b)fluoranthene

e

0.00025

d

207-08-9

Benzo(k)fluoranthene

e

0.0025

d

50-32-8

Benzo(a)pyrene

e

0.0002

c

65-85-0

Benzoic acid

15

a

78-93-3

2-Butanone (methyl ethyl

ketone)

2.3

a

1563-66-2

Carbofuran

0.04

c

75-15-0

Carbon disulfide

0.38

a

56-23-5

Carbon tetrachloride

b

0.005

c

12789-03-6

Chlordane

b

0.002

c

108-90-7

Chlorobenzene

0.l

c

67-66-3

Chloroform

b

0.07

f

218-01-9

Chrysene

e

0.025

d

94-75-7

2,4-D (2,4-dichlorophenoxy

acetic acid)

0.07

c

75-99-0

Dalapon

0.2

c

53-70-3

Dibenzo(a,h)anthracene

e

0.0001

g

96-12-8

1,2-Dibromo-3-chloropropane (dibromochloropropane)

e

0.0002

c

1918-00-9

Dicamba

0.12

a

95-50-1

o

-Dichlorobenzene (1,2-dichlorobenzene)

0.6

c

106-46-7

p

-Dichlorobenzene (1,4-dichlorobenzene)

b

0.075

c

75-71-8

Dichlorodifluoromethane

0.7

7

a

75-34-3

1,1-Dichloroethane

0.77

a

107-06-2

1,2-Dichloroethane

b

0.005

c

75-35-4

1,1-Dichloroethylene

0.007

c

156-59-2

cis

-1,2-Dichloroethylene

0.07

c

156-60-5

trans

-1,2-Dichloroethylene

0.l

c

75-09-2

Dichloromethane (methylene

chloride)

e

0.005

c

78-87-5

1,2-Dichloropropane

b

0.005

c

117-81-7

Di(2-ethylhexyl)phthalate

b

0.006

c

84-66-2

Diethyl phthalate

3.1

a

84-74-2

Di-

n

-butyl phthalate

0.38

a

99-65-0

1,3-Dinitrobenzene

0.001

g

121-14-2

2,4-Dinitrotoluene

b

0.001

g

606-20-2

2,6-Dinitrotoluene

b

0.0001

g

88-85-7

Dinoseb

0.007

c

123-91-1

1,4-Dioxane (

p

-dioxane)

b

0.00078

d

145-73-3

Endothall

0.l

c

72-20-8

Endrin

0.002

c

100-41-4

Ethylbenzene

b

0.7

c

106-93-4

Ethylene dibromide (1,2-dibromoethane)

b

0.00005

c

206-44-0

Fluoranthene

0.15

a

86-73-7

Fluorene

0.15

a

58-89-9

gamma-

HCH (

gamma-

Hexachlorocyclohexane,

lindane)

b

0.0002

c

13252-13-6

HFPO-DA (hexafluoropropylene

oxide dimer acid GenX)

0.000010

c

2691-41-0

HMX (octahydro-1,3,5,7-tetranitro-1,3,5

b

0.00078

d

145-73-3

Endothall

0.l

c

72-20-8

Endrin

0.002

c

100-41-4

Ethylbenzene

b

0.7

c

106-93-4

Ethylene dibromide (1,2-dibromoethane)

b

0.00005

c

206-44-0

Fluoranthene

0.15

a

86-73-7

Fluorene

0.15

a

58-89-9

gamma-

HCH (

gamma-

Hexachlorocyclohexane,

lindane)

b

0.0002

c

13252-13-6

HFPO-DA (hexafluoropropylene

oxide dimer acid GenX)

0.000010

c

2691-41-0

HMX (octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine)

0.77

a

76-44-8

Heptachlor

b

0.0004

c

1024-57-3

Heptachlor epoxide

b

0.0002

c

77-47-4

Hexachlorocyclopentadiene

0.05

c

193-39-5

Indeno(l,2,3-c,d)pyrene

e

0.00025

d

98-82-8

Isopropylbenzene (cumene)

b

0.38

a

93-65-2

MCPP (mecoprop)

0.1

g

1634-04-4

MTBE (methyl tertiary-butyl

ether)

0.038

a

72-43-5

Methoxychlor

0.04

c

90-12-0

1-Methylnaphthalene

0.27

a

91-57-6

2-Methylnaphthalene

0.015

c

95-48-7

2-Methylphenol (

o

-cresol)

0.19

a

91-20-3

Naphthalene

0.077

a

98-95-3

Nitrobenzene

0.0077

a

1336-36-3

PCBs (polychlorinated

biphenyls as decachloro-biphenyl)

b

0.0005

c

375-73-5

PFBS (perfluorobutanesulfonic

acid)

0.002

c

355-46-4

PFHxS (perfluorohexanesulfonic

acid)

0.000010

c

375-95-1

PFNA (perfluorononanoic acid)

0.000010

c

335-67-1

PFOA (perfluorooctanoic acid)

b

0.000004

bc

1763-23-1

PFOS (perfluorooctanesulfonic

acid)

0.000004

bc

87-86-5

Pentachlorophenol

0.00

1

c

108-95-2

Phenol

0.1

h

1918-02-1

Picloram

0.5

c

129-00-0

Pyrene

0.12

a

121-82-4

RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine)

0.062

a

122-34-9

Simazine

0.004

c

100-42-5

Styrene

0.l

c

118-96-7

TNT (2,4,6-trinitrotoluene)

0.0077

a

93-72-1

2,4,5-TP (silvex)

0.05

c

127-18-4

Tetrachloroethylene

b

0.005

c

108-88-3

Toluene

1

c

8001-35-2

Toxaphene

b

0.003

c

120-82-1

1,2,4-Trichlorobenzene

0.07

c

71-55-6

1,1,1-Trichloroethane

0.2

c

79-00-5

1,1,2-Trichloroethane

0.005

c

79-01-6

Trichloroethylene

e

0.005

c

75-69-4

Trichlorofluoromethane

1.2

a

99-35-4

1,3,5-Trinitrobenzene

0.46

a

75-01-4

Vinyl chloride

e

0.002

c

1330-20-7

Xylenes

10

c

Constituent Name and Groundwater

Quality Standard Notations

a

The

standard is the Human Threshold Toxicant Advisory Concent

82-1

1,2,4-Trichlorobenzene

0.07

c

71-55-6

1,1,1-Trichloroethane

0.2

c

79-00-5

1,1,2-Trichloroethane

0.005

c

79-01-6

Trichloroethylene

e

0.005

c

75-69-4

Trichlorofluoromethane

1.2

a

99-35-4

1,3,5-Trinitrobenzene

0.46

a

75-01-4

Vinyl chloride

e

0.002

c

1330-20-7

Xylenes

10

c

Constituent Name and Groundwater

Quality Standard Notations

a

The

standard is the Human Threshold Toxicant Advisory Concentration (HTTAC),

calculated using procedures specified in Appendix A.

b

The

constituent meets the definition of a "carcinogen" in Section

620.110.

c

The

standard is based on the Maximum Contaminant Level (MCL), promulgated by USEPA,

Office of Water, and Illinois Primary Drinking Water Standards in 35 Ill. Adm.

Code 611.

d

The

standard is the Human Nonthreshold Toxicant Advisory Concentration

("HNTAC"), calculated using procedures specified in Appendix A.

e

The

constituent meets the definition of a "mutagen" in Section 620.110.

f

The

standard is based on the Maximum Contaminant Level Goal ("MCLG"),

promulgated by USEPA, Office of Water.

g

The

standard is the "LLOQ" or "LCMRL" as defined in Section

620.110.

h

The

standard is based on 35 Ill. Adm. Code 302.208.

c)         Complex Organic Chemical Mixtures

1)         Concentrations of the following chemical constituents must not

be exceeded in Class I groundwater:

CASRN

Constituent

Standard (mg/L)

71-43-2

Benzene

a

0.005

b

Total BETX

11.705

c

Constituent Name and Groundwater

Quality Standard Notations

a

The

constituent meets the definition of a "carcinogen" in Section

620.110.

b

The

standard is based on the Maximum Contaminant Level (MCL), promulgated by USEPA,

Office of Water, and Illinois Primary Drinking Water Standards at 35 Ill. Adm.

Code 611.

c

The

standard is the total combined standard of benzene, ethylbenzene, toluene, and

xylenes.

2)         Atrazine

and Metabolites

Concentrations of the following

chemical constituents must not be exceeded in Class I groundwater

andard is based on the Maximum Contaminant Level (MCL), promulgated by USEPA,

Office of Water, and Illinois Primary Drinking Water Standards at 35 Ill. Adm.

Code 611.

c

The

standard is the total combined standard of benzene, ethylbenzene, toluene, and

xylenes.

2)         Atrazine

and Metabolites

Concentrations of the following

chemical constituents must not be exceeded in Class I groundwater.

CASRN

Constituent

Standard (mg/L)

1912-24-9

Atrazine

0.003

a

Total Atrazine and Metabolites

0.003

6190-65-4

DEA (desethyl-atrazine)

1007-28-9

DIA (desisopropyl-atrazine)

3397-62-4

DACT (diaminochlorotriazine)

Groundwater Quality Standard

Notation

a

The standard is based on the Maximum Contaminant Level

(MCL), promulgated by USEPA, Office of Water, and Illinois Primary Drinking

Water Standards at 35 Ill. Adm. Code 611.

d)         pH

Except due to

natural causes, a pH range of 6.5 - 9.0 units must not be exceeded in Class I

groundwater.

e)         Beta Particle and Photon Radioactivity

1)         Except due to natural causes, the average annual concentration

of beta particle and photon radioactivity from man-made radionuclides must not

exceed a dose equivalent to the total body or any internal organ greater than 4

mrem/year in Class I groundwater. If two or more radionuclides are present, the

sum of their dose equivalent to the total body or any internal organ must not

exceed 4 mrem/year in Class I groundwater except due to natural causes.

2)         Except for the radionuclides specified in subsection (e)(3),

the concentration of man-made radionuclides causing 4 mrem total body or organ

dose equivalent must be calculated on the basis of a 2 liter per day drinking

water intake using the 168-hour data in compliance with the procedure specified

in NCRP Report Number 22, incorporated by reference in Section 620.125(a)

tural causes.

2)         Except for the radionuclides specified in subsection (e)(3),

the concentration of man-made radionuclides causing 4 mrem total body or organ

dose equivalent must be calculated on the basis of a 2 liter per day drinking

water intake using the 168-hour data in compliance with the procedure specified

in NCRP Report Number 22, incorporated by reference in Section 620.125(a).

3)         Except due to natural causes, the average annual concentration

assumed to produce a total body or organ dose of 4 mrem/year of the following

chemical constituents must not be exceeded in Class I groundwater:

CASRN

Constituent

Critical Organ

Standard (pCi/L)

10028-17-8

Tritium

Total Body

20,000

10098-97-2

Strontium-90

Bone Marrow

8.0

f)         No

facility that is subject to 35 Ill. Adm. Code 811 or 814 must comply with any

requirement or standard of those rules to the extent it incorporates or is

otherwise based on any of the following constituents or their standards under

this Section:

CASRN

Constituent

13252-13-6

HFPO-DA (hexafluoropropylene

oxide dimer acid GenX)

375-73-5

PFBS (perfluorobutanesulfonic

acid)

355-46-4

PFHxS (perfluorohexanesulfonic

acid)

375-95-1

PFNA (perfluorononanoic acid)

335-67-1

PFOA (perfluorooctanoic acid)

1763-23-1

PFOS (perfluorooctanesulfonic

acid)