WAC 173-201A-240. Toxic substances

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Washington Administrative Code › Title 173 › Chapter 173-201A › Section 173-201A-240

This text was captured on Aug 14, 2026. It is a snapshot, not a live feed, so check the official code before relying on it.

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(1) Toxic substances shall not be introduced above natural background levels in waters of the state which have the potential either singularly or cumulatively to adversely affect characteristic water uses, cause acute or chronic toxicity to the most sensitive biota dependent upon those waters, or adversely affect public health, as determined by the department.

(2) The department shall employ or require chemical testing, acute and chronic toxicity testing, and biological assessments, as appropriate, to evaluate compliance with subsection (1) of this section and to ensure that aquatic communities and the existing and designated uses of waters are being fully protected.

(3) USEPA Quality Criteria for Water, 1986, as revised, shall be used in the use and interpretation of the values listed in subsection (5) of this section.

(4) Concentrations of toxic, and other substances with toxic propensities not listed in Table 240 of this section shall be determined in consideration of USEPA Quality Criteria for Water, 1986, and as revised, and other relevant information as appropriate.

(5) The following criteria, found in Table 240, shall be applied to all surface waters of the state of Washington. Values are µg/L for all substances except ammonia and chloride which are mg/L, tissue-based aquatic life criteria for selenium, perfluorooctane sulfonic acid (PFOS), and perfluorooctanoic acid (PFOA) which are mg/kg, and asbestos which is million fibers/L. The department shall formally adopt any appropriate revised criteria as part of this chapter in accordance with the provisions established in chapter 34.05 RCW, the Administrative Procedure Act. The department shall ensure there are early opportunities for public review and comment on proposals to develop revised criteria.

tanoic acid (PFOA) which are mg/kg, and asbestos which is million fibers/L. The department shall formally adopt any appropriate revised criteria as part of this chapter in accordance with the provisions established in chapter 34.05 RCW, the Administrative Procedure Act. The department shall ensure there are early opportunities for public review and comment on proposals to develop revised criteria.

(a) Aquatic life protection . The department may revise the criteria in Table 240 for aquatic life on a statewide or water body-specific basis as needed to protect aquatic life occurring in waters of the state and to increase the technical accuracy of the criteria being applied. The department shall formally adopt any appropriate revised criteria as part of this chapter in accordance with the provisions established in chapter 34.05 RCW, the Administrative Procedure Act.

(b) Human health protection. The following provisions apply to the human health criteria in Table 240. All waters shall maintain a level of water quality when entering downstream waters that provides for the attainment and maintenance of the water quality standards of those downstream waters, including the waters of another state. The human health criteria in the tables were calculated using a fish consumption rate of 175 g/day. Criteria for carcinogenic substances were calculated using a cancer risk level equal to one-in-one-million. The human health criteria calculations and variables include chronic durations of exposure up to 70 years. All human health criteria for metals are for total metal concentrations, unless otherwise noted. Dischargers have the obligation to reduce toxics in discharges through the use of AKART

Criteria for carcinogenic substances were calculated using a cancer risk level equal to one-in-one-million. The human health criteria calculations and variables include chronic durations of exposure up to 70 years. All human health criteria for metals are for total metal concentrations, unless otherwise noted. Dischargers have the obligation to reduce toxics in discharges through the use of AKART.

Table 240

Toxics Substances Criteria

Compound/Chemical Chemical Abstracts Service (CAS)# Aquatic Life Criteria - Freshwater Aquatic Life Criteria - Marine Water Human Health Criteria for Consumption of: Acute Chronic Acute Chronic Water & Organisms Organisms Only Metals: Aluminum 7429905 Western Cordillera: 288 Marine West Coast Forest: 630 Cold Desert: 1,400 (a,e) Western Cordillera: 180 Marine West Coast Forest: 302 Cold Desert: 720 (b,e) - - - - Antimony 7440360 - - - - 6 90 Arsenic 7440382 300 (a,f) 130 (b,f) 69 (a,f,g) 36 (b,f,g) 0.018 (A) 0.14 (A) Asbestos 1332214 - - - - 7,000,000 fibers/L (B) - Beryllium 7440417 - - - - - - Cadmium 7440439 (a,f,h) (b,f,i) 33 (a,f) 7.9 (b,f) - - Chromium (III) 16065831 (a,j,k) (b,j,l) - - - - Chromium (VI) 18540299 18 (a,f,m) 6.6 (b,f,n) 1,100 (a,f,g) 50 (b,f,g) - - Copper 7440508 Western Cordillera: 1.4 Marine West Coast Forest: 2.4 Cold Desert: 4.8 (a,f,o) Western Cordillera: 1.2 Marine West Coast Forest: 1.8 Cold Desert: 3.2 (b,f,p) 4.8 (a,f,g) 3.1 (b,f,g) 1,300 (B) - Lead 7439921 (a,f,q) (b,f,r) 210 (a,f,g) 8.1 (b,f,g) - - Mercury 7439976 1.4 (a,f,s) 0.012 (b,t,u) 1.8 (a,f,g) 0.025 (b,t,u) - - Methylmercury 22967926 - - - - - 0.03 (C) Nickel 7440020 (a,f,v) (b,f,w) 74 (a,f,g) 8.2 (b,f,g) 80 100 Selenium 7782492 (x) (y) 290 (a,f,g) 71 (b,f,g) 60 200 Silver 7440224 (a,f,z) (b,f,aa) 2.3 (a,f,g) 0.91 (b,f,g) - - Thallium 7440280 - - - - 0.24 0.27 Zinc 7440666 (a,f,bb) (b,f,cc) 90 (a,f,g) 81 (b,f,g) 1,000 1,000 Other chemicals: 1,1,1-Trichloroethane 71556 - - - - 20,000 50,000 1,1,2,2-Tetrachloroethane 79345 - - - - 0.1 (D) 0.3 (D) 1,1,2-Trichloroethane 79005 - - - - 0.35 (D) 0.9

,f,g) 80 100 Selenium 7782492 (x) (y) 290 (a,f,g) 71 (b,f,g) 60 200 Silver 7440224 (a,f,z) (b,f,aa) 2.3 (a,f,g) 0.91 (b,f,g) - - Thallium 7440280 - - - - 0.24 0.27 Zinc 7440666 (a,f,bb) (b,f,cc) 90 (a,f,g) 81 (b,f,g) 1,000 1,000 Other chemicals: 1,1,1-Trichloroethane 71556 - - - - 20,000 50,000 1,1,2,2-Tetrachloroethane 79345 - - - - 0.1 (D) 0.3 (D) 1,1,2-Trichloroethane 79005 - - - - 0.35 (D) 0.90 (D) 1,1-Dichloroethane 75343 - - - - - - 1,1-Dichloroethylene 75354 - - - - 700 4,000 1,2,4-Trichlorobenzene 120821 - - - - 0.036 (D) 0.037 (D) 1,2-Dichlorobenzene 95501 - - - - 700 800 1,2-Dichloroethane 107062 - - - - 8.9 (D) 73 (D) 1,2-Dichloropropane 78875 - - - - 0.71 (D) 3.1 (D) 1,3-Dichloropropene 542756 - - - - 0.22 (D) 1.2 (D) 1,2-Diphenylhydrazine 122667 - - - - 0.01 (D) 0.02 (D) 1,2-Trans-Dichloroethylene 156605 - - - - 200 1,000 1,3-Dichlorobenzene 541731 - - - - 2 2 1,4-Dichlorobenzene 106467 - - - - 200 200 2,3,7,8-TCDD (Dioxin) 1746016 - - - - 0.000000064 0.000000064 2,4,6-Trichlorophenol 88062 - - - - 0.25 (D) 0.28 (D) 2,4-Dichlorophenol 120832 - - - - 10 10 2,4-Dimethylphenol 105679 - - - - 85 97 2,4-Dinitrophenol 51285 - - - - 30 100 2,4-Dinitrotoluene 121142 - - - - 0.039 (D) 0.18 (D) 2,6-Dinitrotoluene 606202 - - - - - - 2-Chloroethyvinyl Ether 110758 - - - - - - 2-Chloronaphthalene 91587 - - - - 100 100 2-Chlorophenol 95578 - - - - 15 17 2-Methyl-4,6-Dinitrophenol (4,6-dinitro-o-cresol) 534521 - - - - 3 7 2-Nitrophenol 88755 - - - - - - 3,3'-Dichlorobenzidine 91941 - - - - 0.0031 (D) 0.0033 (D) 3-Methyl-4-Chlorophenol (parachlorometa cresol) 59507 - - - - 36 36 4,4'-DDD 72548 - - - - 0.0000079 (D) 0.0000079 (D) 4,4'-DDE 72559 - - - - 0.00000088 (D) 0.00000088 (D) 4,4'-DDT 50293 - - - - 0.0000012 (D) 0.0000012 (D) 4,4'-DDT (and metabolites) 50293 1.1 (c) 0.001 (d) 0.13 (c) 0.001 (d) - - 4-Bromophenyl Phenyl Ether 101553 - - - - - - 4-Chorophenyl Phenyl Ether 7005723 - - - - - - 4-Nitrophenol 100027 - - - - - - Acenaphthene 83329 - - - - 30 30 Acenaphthylene 208968 - - - - - - Acrolein 107028 3 (a) 3

9 (D) 4,4'-DDE 72559 - - - - 0.00000088 (D) 0.00000088 (D) 4,4'-DDT 50293 - - - - 0.0000012 (D) 0.0000012 (D) 4,4'-DDT (and metabolites) 50293 1.1 (c) 0.001 (d) 0.13 (c) 0.001 (d) - - 4-Bromophenyl Phenyl Ether 101553 - - - - - - 4-Chorophenyl Phenyl Ether 7005723 - - - - - - 4-Nitrophenol 100027 - - - - - - Acenaphthene 83329 - - - - 30 30 Acenaphthylene 208968 - - - - - - Acrolein 107028 3 (a) 3 (b) - - 1.0 1.1 Acrylonitrile 107131 - - - - 0.019 (D) 0.028 (D) Aldrin 309002 3 (c,dd) 0.0019 (d,dd) 1.3 (c,e) 0.0019 (d,dd) 0.000000041 (D) 0.000000041 (D) alpha-BHC 319846 - - - - 0.000048 (D) 0.000048 (D) alpha-Endosulfan 959988 0.22 (c,ee) 0.056 (d,ee) 0.034 (c,ee) 0.0087 (d,ee) 6 7 Ammonia 7664417 (a,ff,ii) (b,gg,ii) 0.233 (a,hh,ii) 0.035 (b,hh,ii) - - Anthracene 120127 - - - - 100 100 Benzene 71432 - - - - 0.44 (D) 1.6 (D) Benzidine 92875 - - - - 0.00002 (D) 0.000023 (D) Benzo(a) Anthracene 56553 - - - - 0.00016 (D) 0.00016 (D) Benzo(a) Pyrene 50328 - - - - 0.000016 (D) 0.000016 (D) Benzo(b) Fluoranthene 205992 - - - - 0.00016 (D) 0.00016 (D) Benzo(ghi) Perylene 191242 - - - - - - Benzo(k) Fluoranthene 207089 - - - - 0.0016 (D) 0.0016 (D) beta-BHC 319857 - - - - 0.0013 (D) 0.0014 (D) beta-Endosulfan 33213659 0.22 (c,ee) 0.056 (d,ee) 0.034 (c,ee) 0.0087 (d,ee) 9.7 10 Bis(2-Chloroethoxy) Methane 111911 - - - - - - Bis(2-Chloroethyl) Ether 111444 - - - - 0.02 (D) 0.06 (D) Bis(2-Chloro-1-Methylethyl) Ether 108601 - - - - 400 900 Bis(2-Ethylhexyl) Phthalate 117817 - - - - 0.045 (D) 0.046 (D) Bromoform 75252 - - - - 4.6 (D) 12 (D) Butylbenzyl Phthalate 85687 - - - - 0.013 (D) 0.013 (D) Carbaryl 63252 2.1 (a) 2.1 (b) 1.6 (a) - - - Carbon Tetrachloride 56235 - - - - 0.2 (D) 0.35 (D) Chlordane 57749 2.4 (c) 0.0043 (d) 0.09 (c) 0.004 (d) 0.000022 (D) 0.000022 (D) Chloride (dissolved) 168870 860 (a,hh,jj) 230 (b,hh,jj) - - - - Chlorine (total residual) 7782505 19 (a) 11 (b) 13 (a) 7.5 (b) - - Chlorobenzene 108907 - - - - 100 200 Chlorodibromomethane 124481 - - - - 0.60 (D) 2.2 (D) Chloroethane 75003 - - - - - - Chloroform 6

- - Carbon Tetrachloride 56235 - - - - 0.2 (D) 0.35 (D) Chlordane 57749 2.4 (c) 0.0043 (d) 0.09 (c) 0.004 (d) 0.000022 (D) 0.000022 (D) Chloride (dissolved) 168870 860 (a,hh,jj) 230 (b,hh,jj) - - - - Chlorine (total residual) 7782505 19 (a) 11 (b) 13 (a) 7.5 (b) - - Chlorobenzene 108907 - - - - 100 200 Chlorodibromomethane 124481 - - - - 0.60 (D) 2.2 (D) Chloroethane 75003 - - - - - - Chloroform 67663 - - - - 100 600 Chlorpyrifos 2921882 0.083 (a) 0.041 (b) 0.011 (a) 0.0056 (b) - - Chrysene 218019 - - - - 0.016 (D) 0.016 (D) Cyanide 57125 8.2 (a,kk) 1.9 (b,kk) 1 (a,kk,ll) 1 (b,kk,ll) 9 (E) 100 (E) delta-BHC 319868 - - - - - - Demeton 8065483 - 0.1 (b) - 0.1 (b) - - Diazinon 333415 0.17 (a) 0.17 (b) 0.82 (a) 0.82 (b) - - Dibenzo(a,h) Anthracene 53703 - - - - 0.000016 (D) 0.000016 (D) Dichlorobromomethane 75274 - - - - 0.73 (D) 2.8 (D) Dieldrin 60571 0.24 (a,dd) 0.056 (b,dd) 0.71 (c,dd) 0.0019 (d,dd) 0.000000070 (D) 0.000000070 (D) Diethyl Phthalate 84662 - - - - 200 200 Dimethyl Phthalate 131113 - - - - 600 600 Di-n-Butyl Phthalate 84742 - - - - 8 8 Di-n-Octyl Phthalate 117840 - - - - - - Endosulfan Sulfate 1031078 - - - - 9 10 Endrin 72208 0.086 (a) 0.036 (b) 0.037 (c) 0.0023 (d) 0.002 0.002 Endrin Aldehyde 7421934 - - - - 0.034 0.035 Ethylbenzene 100414 - - - - 29 31 Fluoranthene 206440 - - - - 6 6 Fluorene 86737 - - - - 10 10 Guthion 86500 - 0.01 (b) - 0.01 (b) - - Hexachlorocyclohexane (gamma-BHC; Lindane) 58899 0.95 (a) 0.08 (d) 0.16 (c) - 0.43 0.43 Heptachlor 76448 0.52 (c) 0.0038 (d) 0.053 (c) 0.0036 (d) 0.00000034 (D) 0.00000034 (D) Heptachlor Epoxide 1024573 - - - - 0.0000024 (D) 0.0000024 (D) Hexachlorobenzene 118741 - - - - 0.0000050 (D) 0.0000050 (D) Hexachlorobutadiene 87683 - - - - 0.01 (D) 0.01 (D) Hexachlorocyclopentadiene 77474 - - - - 1 1 Hexachloroethane 67721 - - - - 0.02 (D) 0.02 (D) Indeno(1,2,3-cd) Pyrene 193395 - - - - 0.00016 (D) 0.00016 (D) Isophorone 78591 - - - - 27 (D) 110 (D) Malathion 121755 - 0.1 (b) - 0.1 (b) - - Methoxychlor 72435 - 0.03 (b) - 0.03 (b) - - Methyl Bromide 74839 - -

18741 - - - - 0.0000050 (D) 0.0000050 (D) Hexachlorobutadiene 87683 - - - - 0.01 (D) 0.01 (D) Hexachlorocyclopentadiene 77474 - - - - 1 1 Hexachloroethane 67721 - - - - 0.02 (D) 0.02 (D) Indeno(1,2,3-cd) Pyrene 193395 - - - - 0.00016 (D) 0.00016 (D) Isophorone 78591 - - - - 27 (D) 110 (D) Malathion 121755 - 0.1 (b) - 0.1 (b) - - Methoxychlor 72435 - 0.03 (b) - 0.03 (b) - - Methyl Bromide 74839 - - - - 300 2,400 Methyl Chloride 74873 - - - - - - Methylene Chloride 75092 - - - - 10 (D) 100 (D) Mirex 2385855 - 0.001 (b) - 0.001 (b) - - N-(1,3-Dimethylbutyl)-N'-phenyl-p-phenylenediamine-quinone (6PPD-quinone) 0.012 (a) - - - - - Napthalene 91203 - - - - - - Nitrobenzene 98953 - - - - 30 100 N-Nitrosodimethylamine 62759 - - - - 0.00065 (D) 0.34 (D) N-Nitrosodi-n-Propylamine 621647 - - - - 0.0044 (D) 0.058 (D) N-Nitrosodiphenylamine 86306 - - - - 0.62 (D) 0.69 (D) Nonylphenol 84852153 28 (a) 6.6 (b) 7 (a) 1.7 (b) - - Parathion 56382 0.065 (a) 0.013 (b) - - - - Pentachlorophenol (PCP) 87865 (a,mm) (b,nn) 13 (a) 6.7 (b) 0.002 (D) 0.002 (D) Perfluorooctane sulfonic acid (PFOS) 3,000 (a) (oo) 550 (a) - - - Perfluorooctanoic acid (PFOA) 49,000 (a) (pp) 7,000 (a) - - - Phenanthrene 85018 - - - - - - Phenol 108952 - - - - 9000 70000 Polychlorinated Biphenyls (PCBs) 2 (d) 0.014 (d) 10 (d) 0.03 (d) 0.000007 (F) 0.000007 (F) Pyrene 129000 - - - - 8 8 Tetrachloroethylene 127184 - - - - 2.4 (D) 2.9 (D) Toluene 108883 - - - - 72 130 Toxaphene 8001352 0.73 (a) 0.0002 (b) 0.21 (a) 0.0002 (b) 0.000032 (D) 0.000032 (D) Tributyltin 0.46 (a) 0.072 (b) 0.42 (a) 0.0074 (b) - - Trichloroethylene 79016 - - - - 0.3 (D) 0.7 (D) Vinyl Chloride 75014 - - - - 0.02 (D) 0.18 (D)

Compound/Chemical

Chemical Abstracts Service

(CAS)#

Aquatic Life

Criteria - Freshwater

Aquatic Life Criteria -

Marine Water

Human Health Criteria

for Consumption of:

Acute

Chronic

Acute

Chronic

Water & Organisms

Organisms Only

Metals:

Aluminum

7429905

Western Cordillera: 288

Marine West Coast

Forest: 630

Cold Desert: 1,400

(a,e)

Western Cordillera: 180

Marine West Coast

For

- - - 0.02 (D) 0.18 (D)

Compound/Chemical

Chemical Abstracts Service

(CAS)#

Aquatic Life

Criteria - Freshwater

Aquatic Life Criteria -

Marine Water

Human Health Criteria

for Consumption of:

Acute

Chronic

Acute

Chronic

Water & Organisms

Organisms Only

Metals:

Aluminum

7429905

Western Cordillera: 288

Marine West Coast

Forest: 630

Cold Desert: 1,400

(a,e)

Western Cordillera: 180

Marine West Coast

Forest: 302

Cold Desert: 720

(b,e)

Antimony

7440360

Arsenic

7440382

300

(a,f)

130

(b,f)

(a,f,g)

(b,f,g)

0.018

(A)

0.14

(A)

Asbestos

1332214

7,000,000

fibers/L (B)

Beryllium

7440417

Cadmium

7440439

(a,f,h)

(b,f,i)

(a,f)

7.9

(b,f)

Chromium (III)

16065831

(a,j,k)

(b,j,l)

Chromium (VI)

18540299

(a,f,m)

6.6

(b,f,n)

1,100

(a,f,g)

(b,f,g)

Copper

7440508

Western Cordillera: 1.4

Marine West Coast

Forest: 2.4

Cold Desert: 4.8

(a,f,o)

Western Cordillera: 1.2

Marine West Coast

Forest: 1.8

Cold Desert: 3.2

(b,f,p)

4.8

(a,f,g)

3.1

(b,f,g)

1,300

(B)

Lead

7439921

(a,f,q)

(b,f,r)

210

(a,f,g)

8.1

(b,f,g)

Mercury

7439976

1.4

(a,f,s)

0.012

(b,t,u)

1.8

(a,f,g)

0.025

(b,t,u)

Methylmercury

22967926

0.03

(C)

Nickel

7440020

(a,f,v)

(b,f,w)

(a,f,g)

8.2

(b,f,g)

100

Selenium

7782492

(x)

(y)

290

(a,f,g)

(b,f,g)

200

Silver

7440224

(a,f,z)

(b,f,aa)

2.3

(a,f,g)

0.91

(b,f,g)

Thallium

7440280

0.24

0.27

Zinc

7440666

(a,f,bb)

(b,f,cc)

(a,f,g)

(b,f,g)

1,000

Other chemicals:

1,1,1-Trichloroethane

71556

20,000

50,000

1,1,2,2-Tetrachloroethane

79345

0.1

(D)

0.3

(D)

1,1,2-Trichloroethane

79005

0.35

(D)

0.90

(D)

1,1-Dichloroethane

75343

1,1-Dichloroethylene

75354

700

4,000

1,2,4-Trichlorobenzene

120821

0.036

(D)

0.037

(D)

1,2-Dichlorobenzene

95501

700

800

1,2-Dichloroethane

107062

8.9

(D)

1,2-Dichloropropane

78875

0.71

(D)

3.1

(D)

1,3-Dichloropropene

542756

0.22

(D)

1.2

(D)

1,2-Diphenylhydrazine

122667

0.01

(D)

0.02

(D)

1,2-Trans-Dichloroet

oroethane

75343

1,1-Dichloroethylene

75354

700

4,000

1,2,4-Trichlorobenzene

120821

0.036

(D)

0.037

(D)

1,2-Dichlorobenzene

95501

700

800

1,2-Dichloroethane

107062

8.9

(D)

1,2-Dichloropropane

78875

0.71

(D)

3.1

(D)

1,3-Dichloropropene

542756

0.22

(D)

1.2

(D)

1,2-Diphenylhydrazine

122667

0.01

(D)

0.02

(D)

1,2-Trans-Dichloroethylene

156605

200

1,000

1,3-Dichlorobenzene

541731

1,4-Dichlorobenzene

106467

200

2,3,7,8-TCDD (Dioxin)

1746016

0.000000064

2,4,6-Trichlorophenol

88062

0.25

(D)

0.28

(D)

2,4-Dichlorophenol

120832

2,4-Dimethylphenol

105679

2,4-Dinitrophenol

51285

100

2,4-Dinitrotoluene

121142

0.039

(D)

0.18

(D)

2,6-Dinitrotoluene

606202

2-Chloroethyvinyl Ether

110758

2-Chloronaphthalene

91587

100

2-Chlorophenol

95578

2-Methyl-4,6-Dinitrophenol

(4,6-dinitro-o-cresol)

534521

2-Nitrophenol

88755

3,3'-Dichlorobenzidine

91941

0.0031

(D)

0.0033

(D)

3-Methyl-4-Chlorophenol (parachlorometa cresol)

59507

4,4'-DDD

72548

0.0000079

(D)

0.0000079

(D)

4,4'-DDE

72559

0.00000088

(D)

0.00000088

(D)

4,4'-DDT

50293

0.0000012

(D)

0.0000012

(D)

4,4'-DDT (and metabolites)

50293

1.1

(c)

0.001

(d)

0.13

(c)

0.001

(d)

4-Bromophenyl

Phenyl Ether

101553

4-Chorophenyl Phenyl Ether

7005723

4-Nitrophenol

100027

Acenaphthene

83329

Acenaphthylene

208968

Acrolein

107028

(a)

(D)

4,4'-DDE

72559

0.00000088

(D)

0.00000088

(D)

4,4'-DDT

50293

0.0000012

(D)

0.0000012

(D)

4,4'-DDT (and metabolites)

50293

1.1

(c)

0.001

(d)

0.13

(c)

0.001

(d)

4-Bromophenyl

Phenyl Ether

101553

4-Chorophenyl Phenyl Ether

7005723

4-Nitrophenol

100027

Acenaphthene

83329

Acenaphthylene

208968

Acrolein

107028

(a)

(b)

1.0

1.1

Acrylonitrile

107131

0.019

(D)

0.028

(D)

Aldrin

309002

(c,dd)

0.0019

(d,dd)

1.3

(c,e)

0.0019

(d,dd)

0.000000041

(D)

0.000000041

(D)

alpha-BHC

319846

0.000048

(D)

0.000048

(D)

alpha-Endosulfan

959988

0.22

(c,ee)

0.056

(d,ee)

0.034

(c,ee)

0.0087

(d,ee)

Ammonia

7664417

(a,ff,ii)

(b,gg,ii)

0.233

(a,hh,ii)

0.035

(b,hh,ii)

Anthracene

120127

100

Benzene

71432

0.44

(D)

1.6

(D)

Benzidine

92875

0.00002

(D)

0.000023

(D)

Benzo(a) Anthracene

56553

0.00016

(D)

0.00016

(D)

Benzo(a) Pyrene

50328

0.000016

(D)

0.000016

(D)

Benzo(b) Fluoranthene

205992

0.00016

(D)

0.00016

(D)

Benzo(ghi) Perylene

191242

Benzo(k) Fluoranthene

207089

0.0016

(D)

0.0016

(D)

beta-BHC

319857

0.0013

(D)

0.0014

(D)

beta-Endosulfan

33213659

0.22

(c,ee)

0.056

(d,ee)

0.034

(c,ee)

0.0087

(d,ee)

9.7

Bis(2-Chloroethoxy)

Methane

111911

Bis(2-Chloroethyl) Ether

111444

0.02

(D)

0.06

(D)

Bis(2-Chloro-1-Methylethyl)

Ether

108601

400

900

Bis(2-Ethylhexyl) Phthalate

117817

0.045

(D)

0.046

(D)

Bromoform

75252

4.6

(D)

Butylbenzyl Phthalate

85687

0.013

(D)

0.013

(D)

Carbaryl

63252

2.1

(a)

2.1

(b)

1.6

(a)

Carbon Tetrachloride

56235

0.2

(D)

0.35

(D)

Chlordane

57749

2.4

(c)

0.0043

(d)

0.09

(c)

0.004

(d)

0.000022

(D)

0.000022

(D)

Chloride (dissolved)

168870

860

(a,hh,jj)

230

(b,hh,jj)

Chlorine (total residual)

7782505

(a)

(b)

(a)

7.5

(D)

Bromoform

75252

4.6

(D)

Butylbenzyl Phthalate

85687

0.013

(D)

0.013

(D)

Carbaryl

63252

2.1

(a)

2.1

(b)

1.6

(a)

Carbon Tetrachloride

56235

0.2

(D)

0.35

(D)

Chlordane

57749

2.4

(c)

0.0043

(d)

0.09

(c)

0.004

(d)

0.000022

(D)

0.000022

(D)

Chloride (dissolved)

168870

860

(a,hh,jj)

230

(b,hh,jj)

Chlorine (total residual)

7782505

(a)

(b)

(a)

7.5

(b)

Chlorobenzene

108907

100

200

Chlorodibromomethane

124481

0.60

(D)

2.2

(D)

Chloroethane

75003

Chloroform

67663

100

600

Chlorpyrifos

2921882

0.083

(a)

0.041

(b)

0.011

(a)

0.0056

(b)

Chrysene

218019

0.016

(D)

0.016

(D)

Cyanide

57125

8.2

(a,kk)

1.9

(b,kk)

(a,kk,ll)

(b,kk,ll)

(E)

100

(E)

delta-BHC

319868

Demeton

8065483

0.1

(b)

0.1

(b)

Diazinon

333415

0.17

(a)

0.17

(b)

0.82

(a)

0.82

(b)

Dibenzo(a,h) Anthracene

53703

0.000016

(D)

0.000016

(D)

Dichlorobromomethane

75274

0.73

(D)

2.8

(D)

Dieldrin

60571

0.24

(a,dd)

0.056

(b,dd)

0.71

(c,dd)

0.0019

(d,dd)

0.000000070

(D)

0.000000070

(D)

Diethyl Phthalate

84662

200

Dimethyl Phthalate

131113

600

Di-n-Butyl Phthalate

84742

Di-n-Octyl Phthalate

117840

Endosulfan Sulfate

1031078

Endrin

72208

0.086

(a)

0.036

(b)

0.037

(c)

0.0023

(d)

0.002

Endrin Aldehyde

7421934

0.034

0.035

Ethylbenzene

100414

Fluoranthene

206440

Fluorene

86737

Guthion

86500

0.01

(b)

0.01

(b)

Hexachlorocyclohexane

(gamma-BHC; Lindane)

58899

0.95

(a)

0.08

(d)

0.16

(c)

0.43

Heptachlor

76448

0.52

(c)

0.0038

(d)

0.053

(c)

0.0036

Endrin

72208

0.086

(a)

0.036

(b)

0.037

(c)

0.0023

(d)

0.002

Endrin Aldehyde

7421934

0.034

0.035

Ethylbenzene

100414

Fluoranthene

206440

Fluorene

86737

Guthion

86500

0.01

(b)

0.01

(b)

Hexachlorocyclohexane

(gamma-BHC; Lindane)

58899

0.95

(a)

0.08

(d)

0.16

(c)

0.43

Heptachlor

76448

0.52

(c)

0.0038

(d)

0.053

(c)

0.0036

(d)

0.00000034

(D)

0.00000034

(D)

Heptachlor Epoxide

1024573

0.0000024

(D)

0.0000024

(D)

Hexachlorobenzene

118741

0.0000050

(D)

0.0000050

(D)

Hexachlorobutadiene

87683

0.01

(D)

0.01

(D)

Hexachlorocyclopentadiene

77474

Hexachloroethane

67721

0.02

(D)

0.02

(D)

Indeno(1,2,3-cd) Pyrene

193395

0.00016

(D)

0.00016

(D)

Isophorone

78591

(D)

110

(D)

Malathion

121755

0.1

(b)

0.1

(b)

Methoxychlor

72435

0.03

(b)

0.03

(b)

Methyl Bromide

74839

300

2,400

Methyl Chloride

74873

Methylene Chloride

75092

(D)

100

(D)

Mirex

2385855

0.001

(b)

0.001

(b)

N-(1,3-Dimethylbutyl)-N'-phenyl-p-phenylenediamine-quinone (6PPD-quinone)

0.012

(a)

Napthalene

91203

Nitrobenzene

98953

100

N-Nitrosodimethylamine

62759

0.00065

(D)

0.34

(D)

N-Nitrosodi-n-Propylamine

621647

0.0044

(D)

0.058

(D)

N-Nitrosodiphenylamine

86306

0.62

(D)

0.69

(D)

Nonylphenol

84852153

(a)

6.6

(b)

(a)

1.7

(b)

Parathion

56382

0.065

(a)

0.013

(b)

Pentachlorophenol (PCP)

87865

(a,mm)

(b,nn)

(a)

6.7

(b)

0.002

(D)

0.002

(D)

Perfluorooctane sulfonic acid (PFOS)

3,000

(a)

(oo)

550

(a)

Perfluorooctanoic acid (PFOA)

49,000

(a)

(pp)

7,000

(a)

Phenanthrene

85018

Phenol

108952

9000

70000

Polychlorinated Biphenyls (PCBs)

(d)

0.014

(d)

0.03

(d)

0.000007

(F)

0.000007

(F)

Pyrene

129000

Tetrachloroethylene

127184

2.4

(D)

2.9

(D)

Toluene

108883

130

Toxaphene

8001352

0.73

(a)

0.0002

(b)

0.21

(a)

0.0002

(a)

(oo)

550

(a)

Perfluorooctanoic acid (PFOA)

49,000

(a)

(pp)

7,000

(a)

Phenanthrene

85018

Phenol

108952

9000

70000

Polychlorinated Biphenyls (PCBs)

(d)

0.014

(d)

0.03

(d)

0.000007

(F)

0.000007

(F)

Pyrene

129000

Tetrachloroethylene

127184

2.4

(D)

2.9

(D)

Toluene

108883

130

Toxaphene

8001352

0.73

(a)

0.0002

(b)

0.21

(a)

0.0002

(b)

0.000032

(D)

0.000032

(D)

Tributyltin

0.46

(a)

0.072

(b)

0.42

(a)

0.0074

(b)

Trichloroethylene

79016

0.3

(D)

0.7

(D)

Vinyl Chloride

75014

0.02

(D)

0.18

(D)

Footnotes for aquatic life criteria in Table 240:

A 1-hour average concentration not to be exceeded more than once every three years on the average.

A 4-day average concentration not to be exceeded more than once every three years on average.

An instantaneous concentration not to be exceeded at any time.

A 24-hour average not to be exceeded at any time.

Criteria are calculated using the Aluminum Criteria Calculator V.2.0 that is published in EPA's "Final Aquatic Water Quality Criteria for Aluminum 2018" (EPA-822-R-1-001). Default criteria values were calculated for EPA Level II ecoregions and are applicable in the absence of water body or site-specific water quality data. The freshwater default acute criterion in the Western Cordillera ecoregion is 288 µg/L, 630 µg/L is the default acute criterion in the Marine West Coast Forest ecoregion, and 1400 µg/L is the default acute criterion in the Cold Desert ecoregion. The freshwater default chronic criterion in the Western Cordillera ecoregion is 180 µg/L, 302 µg/L is the default chronic criterion in the Marine West Coast Forest ecoregion, and 720 µg/L is the default chronic criterion in the Cold Desert ecoregion. The default criterion is used in the absence of concurrently sampled pH, hardness, and dissolved organic carbon for a site-specific location or water body

reshwater default chronic criterion in the Western Cordillera ecoregion is 180 µg/L, 302 µg/L is the default chronic criterion in the Marine West Coast Forest ecoregion, and 720 µg/L is the default chronic criterion in the Cold Desert ecoregion. The default criterion is used in the absence of concurrently sampled pH, hardness, and dissolved organic carbon for a site-specific location or water body. Criteria calculated using concurrently sampled pH, hardness, and dissolved organic carbon for a specific water body supersede the default criteria. The aluminum criteria are based on aluminum toxicity studies where aluminum was analyzed using total recoverable analytical methods. Washington may utilize total recoverable analytical methods to implement the criteria. For characterizing ambient waters, Washington may also utilize, as scientifically appropriate and as allowable by state and federal regulations, analytical methods that measure the bioavailable fraction of aluminum (e.g., utilizing a less aggressive initial acid digestion, such as to a pH of approximately 4 or lower, that includes the measurement of amorphous aluminum hydroxide yet minimizes the measurement of mineralized forms of aluminum such as aluminum silicates associated with suspended sediment particles or clays). Washington shall use measurements of total recoverable aluminum where required by federal regulations.

These ambient criteria in the table are for the dissolved fraction. The cyanide criteria are based on the weak acid dissociable method. The metals criteria may not be used to calculate total recoverable effluent limits unless the seasonal partitioning of the dissolved to total metals in the ambient water are known. When this information is absent, these metals criteria shall be applied as total recoverable values, determined by back-calculation, using the conversion factors incorporated in the criterion equations

ssociable method. The metals criteria may not be used to calculate total recoverable effluent limits unless the seasonal partitioning of the dissolved to total metals in the ambient water are known. When this information is absent, these metals criteria shall be applied as total recoverable values, determined by back-calculation, using the conversion factors incorporated in the criterion equations. Metals criteria may be adjusted on a site-specific basis when data are made available to the department clearly demonstrating the effective use of the water effects ratio approach established by USEPA, as generally guided by the procedures in USEPA Water Quality Standards Handbook, December 1983, as supplemented or replaced by USEPA or ecology. The adjusted site-specific criteria are not in effect until they have been incorporated into this chapter and approved by EPA. Information which is used to develop effluent limits based on applying metals partitioning studies or the water effects ratio approach shall be identified in the permit fact sheet developed pursuant to WAC 173-220-060 or 173-226-110 , as appropriate, and shall be made available for the public comment period required pursuant to WAC 173-220-050 or 173-226-130 (3), as appropriate. Ecology has developed supplemental guidance for conducting water effect ratio studies.

Marine conversion factors (CF) which were used for calculating dissolved metals concentrations are given below. Conversion factors are applicable to both acute and chronic criteria for all metals except mercury. The CF for mercury was applied to the acute criterion only and is not applicable to the chronic criterion. Conversion factors are already incorporated into the criteria in the table. Dissolved criterion = criterion x CF

Metal

Arsenic

1.000

Cadmium

0.994

Chromium (VI)

0.993

Copper

0.83

Lead

0.951

Mercury

0.85

Nickel

0.990

Selenium

0.998

Silver

0.85

Zinc

0.946

Acute criterion = (CF)(e (0.9789[ln(hardness)] - 4.189) ). Conversion factor (CF) is hardness dependent

applicable to the chronic criterion. Conversion factors are already incorporated into the criteria in the table. Dissolved criterion = criterion x CF

Metal

Arsenic

1.000

Cadmium

0.994

Chromium (VI)

0.993

Copper

0.83

Lead

0.951

Mercury

0.85

Nickel

0.990

Selenium

0.998

Silver

0.85

Zinc

0.946

Acute criterion = (CF)(e (0.9789[ln(hardness)] - 4.189) ). Conversion factor (CF) is hardness dependent. CF is calculated for other hardnesses as follows: CF = 1.136672 - [(ln hardness)(0.041838)].

Chronic criterion = (CF)(e (0.7977[ln(hardness)] - 4.446) ). Conversion factor (CF) is hardness dependent. CF is calculated for other hardnesses as follows: CF = 1.101672 - [(ln hardness)(0.041838)].

Where methods to measure trivalent chromium are unavailable, these criteria are to be represented by total-recoverable chromium.

Acute criterion = (0.316)(e (0.8190[ln(hardness)] + 3.533) )

Chronic criterion = (0.860)(e (0.8190[ln(hardness)] + 0.4921) )

The conversion factor used to calculate the dissolved metal concentration is 0.982.

The conversion factor used to calculate the dissolved metal concentration is 0.962.

The acute criterion is represented by the higher criteria value of the two equations: 1) Acute criterion = e (0.700*ln(DOC) + 0.579*ln(hardness) + 0.778*pH – 6.738) and 2) Acute criterion = e (0.855*ln(DOC) + 0.221*ln(hardness) + 0.216*pH – 1.183) . Default criteria values were calculated for EPA Level II ecoregions and are applicable in the absence of water body or site-specific water quality data. The freshwater default acute criterion in the Western Cordillera ecoregion is 1.4 µg/L, 2.4 µg/L is the default acute criterion in the Marine West Coast Forest ecoregion, and 4.8 µg/L is the default acute criterion in the Cold Desert ecoregion. The default criterion is used in the absence of concurrently sampled pH, hardness, and dissolved organic carbon for a site-specific location or water body

The freshwater default acute criterion in the Western Cordillera ecoregion is 1.4 µg/L, 2.4 µg/L is the default acute criterion in the Marine West Coast Forest ecoregion, and 4.8 µg/L is the default acute criterion in the Cold Desert ecoregion. The default criterion is used in the absence of concurrently sampled pH, hardness, and dissolved organic carbon for a site-specific location or water body. Criteria calculated using concurrently sampled pH, hardness, and dissolved organic carbon for a specific water body supersede the default criteria.

Chronic criterion = e (0.855*ln(DOC) + 0.221*ln(hardness) + 0.216*pH – 1.402) . Default criteria values were calculated for EPA Level II ecoregions and are applicable in the absence of water body or site-specific water quality data. The freshwater default chronic criterion in the Western Cordillera ecoregion is 1.2 µg/L, 1.8 µg/L is the default chronic criterion in the Marine West Coast Forest ecoregion, and 3.2 µg/L is the default chronic criterion in the Cold Desert ecoregion. 1.6 µg/L is applicable in western Washington and 1.8 µg/L is the applicable default chronic criterion in eastern Washington. The default criterion is used in the absence of concurrently sampled pH, hardness, and dissolved organic carbon for a site-specific location or water body. Criteria calculated using concurrently sampled pH, hardness, and dissolved organic carbon for a specific water body supersede the default criteria.

Acute criterion = (CF)(e (1.273[ln(hardness)] - 1.460) ). Conversion factor (CF) is hardness dependent. CF is calculated for other hardnesses as follows:

CF = 1.46203 - [(ln hardness)(0.145712)].

Chronic criterion = (CF)(e (1.273[ln(hardness)] - 4.705) ). Conversion factor (CF) is hardness dependent. CF is calculated for other hardnesses as follows: CF = 1.46203 - [(ln hardness)(0.145712)].

The conversion factor used to calculate the dissolved metal concentration is 0.85.

These criteria are based on the total-recoverable fraction of the metal.

.46203 - [(ln hardness)(0.145712)].

Chronic criterion = (CF)(e (1.273[ln(hardness)] - 4.705) ). Conversion factor (CF) is hardness dependent. CF is calculated for other hardnesses as follows: CF = 1.46203 - [(ln hardness)(0.145712)].

The conversion factor used to calculate the dissolved metal concentration is 0.85.

These criteria are based on the total-recoverable fraction of the metal.

If the four-day average chronic concentration is exceeded more than once in a three-year period, the edible portion of the consumed species should be analyzed. Said edible tissue concentrations shall not be allowed to exceed 1.0 mg/kg of methylmercury.

Acute criterion = (0.998)(e (0.8460[ln(hardness)] + 0.1667) )

Chronic criterion = (0.997)(e (0.8460[ln(hardness)] - 1.466) )

There is no freshwater acute criterion for aquatic life for selenium. The freshwater chronic criterion is expected to adequately protect against acute effects.

Freshwater chronic selenium criteria:

15.1 mg/kg dry weight (egg-ovary tissue) 1

8.5 mg/kg dry weight (whole-body tissue) 2

11.3 mg/kg dry weight (muscle tissue) 2

1.5 µg/L (water lentic) 3

3.1 µg/L (water lotic) 3

WQC int = WQC – C bkgrnd (1 – f int ) / f int (water lentic or lotic) 3,4

1 Egg-ovary supersedes any whole-body, muscle, or water column element when fish egg-ovary concentrations are measured, except as noted in footnote 4. Tissue criterion is not to be exceeded.

2 Fish whole-body or muscle tissue supersedes the water column element when both fish tissue and water concentrations are measured, except as noted in footnote 4. Tissue criterion is not to be exceeded.

3 Water column values are based on dissolved total selenium in water and are derived from fish tissue values via bioaccumulation modeling. When selenium inputs are increasing, water column values are the applicable criterion element in the absence of steady-state condition fish tissue data. Water column criteria are based on a 30-day average concentrations, except for WQC int (see footnote 4)

ded.

4 Where WQC int is the intermittent exposure concentration in µg/L; WQC is the applicable water column element, for either lentic or lotic waters; C bkgrnd is the average daily background concentration occurring during the remaining time, integrated over 30 days; f int is the fraction of any 30-day period during which elevated selenium concentrations occur, with f int assigned a value ≥ 0.033 (corresponding to one day). Intermittent exposure criteria averaging period is the number of days per month with an elevated concentration.

Acute criterion = (0.85)(e (1.72[ln(hardness)] – 8.590) )

aa.

Chronic criterion = (0.85)(e (1.72[ln(hardness)] – 9.511) )

bb.

Acute criterion = (0.978)(e (0.8473[ln(hardness)] + 0.3313) )

cc.

Chronic criterion = (0.986)(e (0.8473[ln(hardness)] – 0.6900) )

dd.

Aldrin is metabolically converted to Dieldrin. Therefore, the sum of the Aldrin and Dieldrin concentrations are compared with the Dieldrin criteria.

ee.

This value was derived from data for endosulfan. Where concentrations for both alpha-endosulfan and beta-endosulfan are available, the sum of alpha-endosulfan and beta-endosulfan concentrations shall be compared to the criteria.

ff.

Shall not exceed the numerical value in total ammonia nitrogen (mg N/L) given by:

For salmonids present: 0.275 + 39.0 1 + 10 7.204- pH 1 + 10 pH -7.204 For salmonids absent: 0.411 + 58.4 1 + 10 7.204- pH 1 + 10 pH -7.204

For salmonids present:

0.275

39.0

1 + 10 7.204- pH

1 + 10 pH -7.204

For salmonids absent:

0.411

58.4

1 + 10 7.204- pH

1 + 10 pH -7.204

hall be compared to the criteria.

ff.

Shall not exceed the numerical value in total ammonia nitrogen (mg N/L) given by:

For salmonids present: 0.275 + 39.0 1 + 10 7.204- pH 1 + 10 pH -7.204 For salmonids absent: 0.411 + 58.4 1 + 10 7.204- pH 1 + 10 pH -7.204

For salmonids present:

0.275

39.0

1 + 10 7.204- pH

1 + 10 pH -7.204

For salmonids absent:

0.411

58.4

1 + 10 7.204- pH

1 + 10 pH -7.204

gg.

Shall not exceed the numerical concentration calculated as follows:

Unionized ammonia concentration for waters where salmonid habitat is an existing or designated use:

0.80 ÷ (FT)(FPH)(RATIO) where: RATIO = 13.5; 7.7 ≤ pH ≤ 9 RATIO = (20.25 x 10 (7.7-pH) ) ÷ (1 + 10 (7.4-pH) ); 6.5 ≤ pH ≤ 7.7 FT = 1.4; 15 ≤ T ≤ 30 FT = 10 [0.03(20-T)] ; 0 ≤ T ≤ 15 FPH = 1; 8 ≤ pH ≤ 9 FPH = (1 + 10 (7.4-pH) ) ÷ 1.25; 6.5 ≤ pH ≤ 8.0

0.80 ÷ (FT)(FPH)(RATIO)

where:

RATIO

13.5; 7.7 ≤ pH ≤ 9

RATIO

(20.25 x 10 (7.7-pH) ) ÷ (1 + 10 (7.4-pH) ); 6.5 ≤ pH ≤ 7.7

1.4; 15 ≤ T ≤ 30

10 [0.03(20-T)] ; 0 ≤ T ≤ 15

FPH

1; 8 ≤ pH ≤ 9

FPH

(1 + 10 (7.4-pH) ) ÷ 1.25; 6.5 ≤ pH ≤ 8.0

Total ammonia concentrations for waters where salmonid habitat is not an existing or designated use and other fish early life stages are absent:

where: A = the greater of either T (temperature in degrees Celsius) or 7.

where: A

the greater of either T (temperature in degrees Celsius) or 7.

Applied as a 30-day average concentration of total ammonia nitrogen (in mg N/L) not to be exceeded more than once every three years on average. The highest four-day average within the 30-day period should not exceed 2.5 times the chronic criterion.

Total ammonia concentration for waters where salmonid habitat is not an existing or designated use and other fish early life stages are present:

where: B = the lower of either 2.85, or 1.45 x 10 0.028 x (25-T) . T = temperature in degrees Celsius.

where: B

the lower of either 2.85, or 1.45 x 10 0.028 x (25-T) . T = temperature in degrees Celsius

should not exceed 2.5 times the chronic criterion.

Total ammonia concentration for waters where salmonid habitat is not an existing or designated use and other fish early life stages are present:

where: B = the lower of either 2.85, or 1.45 x 10 0.028 x (25-T) . T = temperature in degrees Celsius.

where: B

the lower of either 2.85, or 1.45 x 10 0.028 x (25-T) . T = temperature in degrees Celsius.

Applied as a 30-day average concentration of total ammonia nitrogen (in mg N/L) not to be exceeded more than once every three years on the average. The highest four-day average within the 30-day period should not exceed 2.5 times the chronic criterion.

hh.

Measured in milligrams per liter rather than micrograms per liter.

ii.

The listed freshwater criteria are based on un-ionized or total ammonia concentrations, while those for marine water are based on un-ionized ammonia concentrations. Tables for the conversion of total ammonia to un-ionized ammonia for freshwater can be found in the USEPA's Quality Criteria for Water, 1986. Criteria concentrations based on total ammonia for marine water can be found in USEPA Ambient Water Quality Criteria for Ammonia (Saltwater)-1989, EPA440/ 5-88-004 , April 1989.

jj.

Criterion based on dissolved chloride in association with sodium. This criterion probably will not be adequately protective when the chloride is associated with potassium, calcium, or magnesium, rather than sodium.

kk.

The criteria for cyanide is based on the weak acid dissociable method in the 19th Ed. Standard Methods for the Examination of Water and Wastewater, 4500-CN I, and as revised (see footnote f, above).

ll.

The cyanide criteria are: 2.8 µg/L chronic and 9.1 µg/L acute and are applicable only to waters which are east of a line from Point Roberts to Lawrence Point, to Green Point to Deception Pass; and south from Deception Pass and of a line from Partridge Point to Point Wilson. The chronic criterion applicable to the remainder of the marine waters is l µg/L.

mm.

Acute criterion = e [1.005(pH) – 5.450]

cyanide criteria are: 2.8 µg/L chronic and 9.1 µg/L acute and are applicable only to waters which are east of a line from Point Roberts to Lawrence Point, to Green Point to Deception Pass; and south from Deception Pass and of a line from Partridge Point to Point Wilson. The chronic criterion applicable to the remainder of the marine waters is l µg/L.

mm.

Acute criterion = e [1.005(pH) – 5.450]

nn.

Chronic criterion = e [1.005(pH) – 6.155]

oo.

Freshwater chronic PFOS criteria:

8.4 µg/L (water) 1,2

0.937 mg/kg ww (invertebrate whole-body) 1,3,4

6.75 mg/kg ww (fish whole-body) 1,3,4

2.91 mg/kg ww (fish muscle) 1,3,4

1 All water column and tissue criteria are intended to be independently applicable for compliance determinations and no one criterion takes primacy.

2 Water column criteria are based on a four-day average concentration not to be exceeded more than once every three years on average.

3 Tissue criteria derived from the chronic water column concentration with the use of bioaccumulation factors and are expressed as wet weight (ww) concentrations.

4 Tissue data is an instantaneous point measurement that reflect integrative accumulation of PFOS over time and space. Criteria are not to be exceeded more than once every 10 years on average.

pp.

Freshwater chronic PFOA criteria:

94 µg/L (water) 1,2

1.11 mg/kg ww (invertebrate whole-body) 1,3,4

6.10 mg/kg ww (fish whole-body) 1,3,4

0.125 mg/kg ww (fish muscle) 1,3,4

1 All water column and tissue criteria are intended to be independently applicable for compliance determinations and no one criterion takes primacy.

2 Water column criteria are based on a four-day average concentration not to be exceeded more than once every three years on average.

3 Tissue criteria derived from the chronic water column concentration with the use of bioaccumulation factors and are expressed as wet weight (ww) concentrations.

4 Tissue data is an instantaneous point measurement that reflect integrative accumulation of PFOA over time and space

criteria are based on a four-day average concentration not to be exceeded more than once every three years on average.

3 Tissue criteria derived from the chronic water column concentration with the use of bioaccumulation factors and are expressed as wet weight (ww) concentrations.

4 Tissue data is an instantaneous point measurement that reflect integrative accumulation of PFOA over time and space. Criteria are not to be exceeded more than once every 10 years on average.

Footnotes for human health criteria in Table 240:

This criterion refers to the inorganic form of arsenic only. These criteria were promulgated for Washington in the National Toxics Rule at 40 C.F.R. 131.36 and are moved to 40 C.F.R. 131.45 to have one comprehensive human health criteria rule for Washington.

This criterion is based on a regulatory level developed under the Safe Drinking Water Act.

This criterion is expressed as the fish tissue concentration of methylmercury (mg methylmercury/kg fish). See Water Quality Criterion for the Protection of Human Health: Methylmercury (EPA-823-R-01-001, January 3, 2001) for how this value is calculated using the criterion equation in EPA's 2000 Human Health Methodology rearranged to solve for a protective concentration in fish tissue rather than in water.

This criterion was calculated based on an additional lifetime cancer risk of one-in-one-million (1 × 10 -6 risk level).

This recommended water quality criterion is expressed as total cyanide, even though the integrated risk information system RfD used to derive the criterion is based on free cyanide. The multiple forms of cyanide that are present in ambient water have significant differences in toxicity due to their differing abilities to liberate the CN-moiety. Some complex cyanides require even more extreme conditions than refluxing with sulfuric acid to liberate the CN-moiety. Thus, these complex cyanides are expected to have little or no "bioavailability" to humans

s based on free cyanide. The multiple forms of cyanide that are present in ambient water have significant differences in toxicity due to their differing abilities to liberate the CN-moiety. Some complex cyanides require even more extreme conditions than refluxing with sulfuric acid to liberate the CN-moiety. Thus, these complex cyanides are expected to have little or no "bioavailability" to humans. If a substantial fraction of the cyanide present in a water body is present in a complexed form (e.g., Fe4[Fe(CN)6]3), this criterion may be overly conservative.

This criterion applies to total PCBs, (e.g., the sum of all congener or all isomer or homolog or Aroclor analyses).

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