481 

Environmental Protection Agency § 131.36 

North Star Creek ....................... Class III 

Okanogan River from Reservation north boundary to Columbia River.

Class II 

Olds Creek ................................ Class I 

Omak Creek .............................. Class II 

Onion Creek .............................. Class II 

Parmenter Creek ....................... Class III 

Peel Creek ................................. Class III 

Peter Dan Creek ....................... Class III 

Rock Creek ................................ Class I 

San Poil River ........................... Class I 

Sanpoil, River West Fork .......... Class II 

Seventeen Mile Creek ............... Class III 

Silver Creek ............................... Class III 

Sitdown Creek ........................... Class III 

Six Mile Creek ........................... Class III 

South Nanamkin Creek ............. Class III 

Spring Creek ............................. Class III 

Stapaloop Creek ........................ Class III 

Stepstone Creek ........................ Class III 

Stranger Creek .......................... Class II 

Strawberry Creek ....................... Class III 

Swimptkin Creek ....................... Class III 

Three Forks Creek .................... Class I 

Three Mile Creek ....................... Class III 

Thirteen Mile Creek ................... Class II 

Thirty Mile Creek ....................... Class II 

Trail Creek ................................. Class III 

Twentyfive Mile Creek ............... Class III 

Twentyone Mile Creek .............. Class III 

Twentythree Mile Creek ............ Class III 

Wannacot Creek ........................ Class III 

Wells Creek ............................... Class I 

Whitelaw Creek ......................... Class III 

Wilmont Creek ........................... Class II 

(2) Lakes: 

Apex Lake ................................. LC 

Big Goose Lake ......................... LC 

Bourgeau Lake .......................... LC 

Buffalo Lake .............................. LC 

Cody Lake ................................. LC 

Crawfish Lakes .......................... LC 

Camille Lake .............................. LC 

Elbow Lake ................................ LC 

Fish Lake ................................... LC 

Gold Lake .................................. LC 

Great Western Lake .................. LC 

Johnson Lake ............................ LC 

LaFleur Lake ............................. LC 

Little Goose Lake ...................... LC 

Little Owhi Lake ......................... LC 

McGinnis Lake ........................... LC 

Nicholas Lake ............................ LC 

Omak Lake ................................ SRW 

Owhi Lake ................................. SRW 

Penley Lake ............................... SRW 

Rebecca Lake ........................... LC 

Round Lake ............................... LC 

Simpson Lake ............................ LC 

Soap Lake ................................. LC 

Sugar Lake ................................ LC 

Summit Lake ............................. LC 

Twin Lakes ................................ SRW 

[54 FR 28625, July 6, 1989] 

§ 131.36 Toxics criteria for those states 

not complying with Clean Water 

Act section 303(c)(2)(B). 

(a) Scope. This section is not a general promulgation of the section 304(a) 

criteria for priority toxic pollutants 

but is restricted to specific pollutants 

in specific States. 

(b)(1) EPA’s Section 304(a) criteria 

for Priority Toxic Pollutants. 


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§ 131.36 40 CFR Ch. I (7–1–10 Edition) A B Freshwater C Saltwater D Human Health (10¥6 risk for carcinogens) For consumption of: (#) Compound CAS Number Criterion Maximum Conc. d

(μg/L) 

(B1) 

Criterion 

Continuous 

Conc. d

(μg/L) 

(B2) 

Criterion 

Maximum 

Conc. d

(μg/L) 

(C1) 

Criterion 

Continuous 

Conc. d

(μg/L) 

(C2) 

Water & 

Organisms 

(μg/L) 

(D1) 

Organisms 

Only 

(μg/L) 

(D2) 

1 Antimony ................................................................... 7440360 .......................... .......................... .......................... .......................... 14 a 4300 a 2 Arsenic ...................................................................... 7440382 360 m 190 m 69 m 36 m 0.018 abc 0.14 abc 3 Beryllium ................................................................... 7440417 .......................... .......................... .......................... .......................... n n 4 Cadmium ................................................................... 7440439 3.7 e 1.0 e 42 m 9.3 m n n 5a Chromium (III) ........................................................... 16065831 550 e 180 e .......................... .......................... n n 

b Chromium (VI) ........................................................... 18540299 15 m 10 m 1100 m 50 m n n 

6 Copper ...................................................................... 7440508 17 e 11 e 2.4 m 2.4 m 7 Lead .......................................................................... 7439921 65 e 2.5 e 210 m 8.1 m n n 8 Mercury ..................................................................... 7439976 2.1 m 0.012 ip 1.8 m 0.025 ip 0.14 0.15 9 Nickel ........................................................................ 7440020 1400 e 160 e 74 m 8.2 m 610 a 4600 a 

10 Selenium ................................................................... 7782492 20 p 5 p 290 m 71 m n n 11 Silver ......................................................................... 7440224 3.4 e .......................... 1.9 m 12 Thallium .................................................................... 7440280 .......................... .......................... .......................... .......................... 1.7 a 6.3 a 13 Zinc ........................................................................... 7440666 110 e 100 e 90 m 81 m 14 Cyanide ..................................................................... 57125 22 5.2 1 1 700 a 220000 aj 15 Asbestos ................................................................... 1332214 .......................... .......................... .......................... .......................... 7,000,000 

fibers/L k 

16 2,3,7,8-TCDD (Dioxin) .............................................. 1746016 .......................... .......................... .......................... .......................... 0.000000013 c 0.000000014 c 17 Acrolein ..................................................................... 107028 .......................... .......................... .......................... .......................... 320 780 18 Acrylonitrile ............................................................... 107131 .......................... .......................... .......................... .......................... 0.059 ac 0.66 ac 19 Benzene .................................................................... 71432 .......................... .......................... .......................... .......................... 1.2 ac 71 ac 20 Bromoform ................................................................ 75252 .......................... .......................... .......................... .......................... 4.3 ac 360 ac 21 Carbon Tetrachloride ................................................ 56235 .......................... .......................... .......................... .......................... 0.25 ac 4.4 ac 22 Chlorobenzene ......................................................... 108907 .......................... .......................... .......................... .......................... 680 a 21000 aj 23 Chlorodibromomethane ............................................ 124481 .......................... .......................... .......................... .......................... 0.41 ac 34 ac 24 Chloroethane ............................................................ 75003 25 2-Chloroethylvinyl Ether ........................................... 110758 26 Chloroform ................................................................ 67663 .......................... .......................... .......................... .......................... 5.7 ac 470 ac 27 Dichlorobromomethane ............................................ 75274 .......................... .......................... .......................... .......................... 0.27 ac 22 ac 28 1,1-Dichloroethane ................................................... 75343 29 1,2-Dichloroethane ................................................... 107062 .......................... .......................... .......................... .......................... 0.38 ac 99 ac 30 1,1-Dichloroethylene ................................................. 75354 .......................... .......................... .......................... .......................... 0.057 ac 3.2 ac 31 1,2-Dichloropropane ................................................. 78875 32 1,3-Dichloropropylene ............................................... 542756 .......................... .......................... .......................... .......................... 10 a 1700 a 33 Ethylbenzene ............................................................ 100414 .......................... .......................... .......................... .......................... 3100 a 29000 a 34 Methyl Bromide ......................................................... 74839 .......................... .......................... .......................... .......................... 48 a 4000 a 35 Methyl Chloride ......................................................... 74873 .......................... .......................... .......................... .......................... n n 36 Methylene Chloride ................................................... 75092 .......................... .......................... .......................... .......................... 4.7 ac 1600 ac 37 1,1,2,2-Tetrachloroethane ........................................ 79345 .......................... .......................... .......................... .......................... 0.17 ac 11 ac 38 Tetrachloroethylene .................................................. 127184 .......................... .......................... .......................... .......................... 0.8 c 8.85 c 39 Toluene ..................................................................... 108883 .......................... .......................... .......................... .......................... 6800 a 200000 a 


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Environmental Protection Agency § 131.36 40 1,2-Trans-Dichloroethylene ...................................... 156605 41 1,1,1-Trichloroethane ................................................ 71556 .......................... .......................... .......................... .......................... n n 42 1,1,2-Trichloroethane ................................................ 79005 .......................... .......................... .......................... .......................... 0.60 ac 42 ac 43 Trichloroethylene ...................................................... 79016 .......................... .......................... .......................... .......................... 2.7 c 81 c 44 Vinyl Chloride ........................................................... 75014 .......................... .......................... .......................... .......................... 2 c 525 c 45 2-Chlorophenol ......................................................... 95578 46 2,4-Dichlorophenol .................................................... 120832 .......................... .......................... .......................... .......................... 93 a 790 aj 47 2,4-Dimethylphenol ................................................... 105679 48 2-Methyl-4,6-Dinitrophenol ....................................... 534521 .......................... .......................... .......................... .......................... 13.4 765 49 2,4-Dinitrophenol ...................................................... 51285 .......................... .......................... .......................... .......................... 70 a 14000 a 50 2-Nitrophenol ............................................................ 88755 51 4-Nitrophenol ............................................................ 100027 52 3-Methyl-4-Chlorophenol .......................................... 59507 53 Pentachlorophenol .................................................... 87865 20 f 13 f 13 7.9 0.28 ac 8.2 acj 54 Phenol ....................................................................... 108952 .......................... .......................... .......................... .......................... 21000 a 4600000 aj 55 2,4,6-Trichlorophenol ................................................ 88062 .......................... .......................... .......................... .......................... 2.1 ac 6.5 ac 56 Acenaphthene ........................................................... 83329 57 Acenaphthylene ........................................................ 208968 58 Anthracene ............................................................... 120127 .......................... .......................... .......................... .......................... 9600 a 110000 a 59 Benzidine .................................................................. 92875 .......................... .......................... .......................... .......................... 0.00012 ac 0.00054 ac 60 Benzo(a)Anthracene ................................................. 56553 .......................... .......................... .......................... .......................... 0.0028 c 0.031 c 61 Benzo(a)Pyrene ........................................................ 50328 .......................... .......................... .......................... .......................... 0.0028 c 0.031 c 62 Benzo(b)Fluoranthene .............................................. 205992 .......................... .......................... .......................... .......................... 0.0028 c 0.031 c 63 Benzo(ghi)Perylene .................................................. 191242 64 Benzo(k)Fluoranthene .............................................. 207089 .......................... .......................... .......................... .......................... 0.0028 c 0.031 c 65 Bis(2-Chloroethoxy)Methane .................................... 111911 66 Bis(2-Chloroethyl)Ether ............................................ 111444 .......................... .......................... .......................... .......................... 0.031 ac 1.4 ac 67 Bis(2-Chloroisopropyl)Ether ...................................... 108601 .......................... .......................... .......................... .......................... 1400 a 170000 a 68 Bis(2-Ethylhexyl)Phthalate ........................................ 117817 .......................... .......................... .......................... .......................... 1.8 ac 5.9 ac 69 4-Bromophenyl Phenyl Ether ................................... 101553 70 Butylbenzyl Phthalate ............................................... 85687 71 2-Chloronaphthalene ................................................ 91587 72 4-Chlorophenyl Phenyl Ether ................................... 7005723 73 Chrysene .................................................................. 218019 .......................... .......................... .......................... .......................... 0.0028 c 0.031 c 74 Dibenzo(ah)Anthracene ............................................ 53703 .......................... .......................... .......................... .......................... 0.0028 c 0.031 c 75 1,2-Dichlorobenzene ................................................. 95501 .......................... .......................... .......................... .......................... 2700 a 17000 a 76 1,3-Dichlorobenzene ................................................. 541731 .......................... .......................... .......................... .......................... 400 2600 77 1,4-Dichlorobenzene ................................................. 106467 .......................... .......................... .......................... .......................... 400 2600 78 3,3′-Dichlorobenzidine .............................................. 91941 .......................... .......................... .......................... .......................... 0.04 ac 0.077 ac 79 Diethyl Phthalate ...................................................... 84662 .......................... .......................... .......................... .......................... 23000 a 120000 a 80 Dimethyl Phthalate ................................................... 131113 .......................... .......................... .......................... .......................... 313000 2900000 81 Di-n-Butyl Phthalate .................................................. 84742 .......................... .......................... .......................... .......................... 2700 a 12000 a 82 2,4-Dinitrotoluene ..................................................... 121142 .......................... .......................... .......................... .......................... 0.11 c 9.1 c 83 2,6-Dinitrotoluene ..................................................... 606202 84 Di-n-Octyl Phthalate ................................................. 117840 85 1,2-Diphenylhydrazine .............................................. 122667 .......................... .......................... .......................... .......................... 0.040 ac 0.54 ac 86 Fluoranthene ............................................................. 206440 .......................... .......................... .......................... .......................... 300 a 370 a 87 Fluorene .................................................................... 86737 .......................... .......................... .......................... .......................... 1300 a 14000 a 88 Hexachlorobenzene .................................................. 118741 .......................... .......................... .......................... .......................... 0.00075 ac 0.00077 ac 89 Hexachlorobutadiene ................................................ 87683 .......................... .......................... .......................... .......................... 0.44 ac 50 ac 


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§ 131.36 40 CFR Ch. I (7–1–10 Edition) A B Freshwater C Saltwater D Human Health (10¥6 risk for carcinogens) For consumption of: (#) Compound CAS Number Criterion Maximum Conc. d

(μg/L) 

(B1) 

Criterion 

Continuous 

Conc. d

(μg/L) 

(B2) 

Criterion 

Maximum 

Conc. d

(μg/L) 

(C1) 

Criterion 

Continuous 

Conc. d

(μg/L) 

(C2) 

Water & 

Organisms 

(μg/L) 

(D1) 

Organisms 

Only 

(μg/L) 

(D2) 

90 Hexachlorocyclopentadiene ...................................... 77474 .......................... .......................... .......................... .......................... 240 a 17000 aj 91 Hexachloroethane ..................................................... 67721 .......................... .......................... .......................... .......................... 1.9 ac 8.9 ac 92 Indeno(1,2,3-cd)Pyrene ............................................ 193395 .......................... .......................... .......................... .......................... 0.0028 c 0.031 c 93 Isophorone ................................................................ 78591 .......................... .......................... .......................... .......................... 8.4 ac 600 ac 94 Naphthalene ............................................................. 91203 95 Nitrobenzene ............................................................ 98953 .......................... .......................... .......................... .......................... 17 a 1900 aj 96 N-Nitrosodimethylamine ........................................... 62759 .......................... .......................... .......................... .......................... 0.00069 ac 8.1 ac 97 N-Nitrosodi-n-Propylamine ....................................... 621647 98 N-Nitrosodiphenylamine ........................................... 86306 .......................... .......................... .......................... .......................... 5.0 ac 16 ac 99 Phenanthrene ........................................................... 85018 

100 Pyrene ...................................................................... 129000 .......................... .......................... .......................... .......................... 960 a 11000 a 101 1,2,4-Trichlorobenzene ............................................. 120821 102 Aldrin ......................................................................... 309002 3 g .......................... 1.3 g .......................... 0.00013 ac 0.00014 ac 103 alpha-BHC ................................................................ 319846 .......................... .......................... .......................... .......................... 0.0039 ac 0.013 ac 104 beta-BHC .................................................................. 319857 .......................... .......................... .......................... .......................... 0.014 ac 0.046 ac 105 gamma-BHC ............................................................. 58899 2 g 0.08 g 0.16 g .......................... 0.019 c 0.063 c 106 delta-BHC ................................................................. 319868 107 Chlordane ................................................................. 57749 2.4 g 0.0043 g 0.09 g 0.004 g 0.00057 ac 0.00059 ac 108 4,4′-DDT ................................................................... 50293 1.1 g 0.001 g 0.13 g 0.001 g 0.00059 ac 0.00059 ac109 4,4′-DDE ................................................................... 72559 .......................... .......................... .......................... .......................... 0.00059 ac 0.00059 ac 110 4,4′-DDD ................................................................... 72548 .......................... .......................... .......................... .......................... 0.00083 ac 0.00084 ac 111 Dieldrin ...................................................................... 60571 2.5 g 0.0019 g 0.71 g 0.0019 g 0.00014 ac 0.00014 ac 112 alpha-Endosulfan ...................................................... 959988 0.22 g 0.056 g 0.034 g 0.0087 g 0.93 a 2.0 a 113 beta-Endosulfan ........................................................ 33213659 0.22 g 0.056 g 0.034 g 0.0087 g 0.93 a 2.0 a114 Endosulfan Sulfate ................................................... 1031078 .......................... .......................... .......................... .......................... 0.93 a 2.0 a 115 Endrin ....................................................................... 72208 0.18 g 0.0023 g 0.037 g 0.0023 g 0.76 a 0.81 aj 116 Endrin Aldehyde ....................................................... 7421934 .......................... .......................... .......................... .......................... 0.76 a 0.81 aj 117 Heptachlor ................................................................ 76448 0.52 g 0.0038 g 0.053 g 0.0036 g 0.00021 ac 0.00021 ac 118 Heptachlor Epoxide .................................................. 1024573 0.52 g 0.0038 g 0.053 g 0.0036 g 0.00010 ac 0.00011 ac 119 PCB–1242 ................................................................ 53469219 .......................... 0.014 g .......................... 0.03 g 120 PCB–1254 ................................................................ 11097691 .......................... 0.014 g .......................... 0.03 g 121 PCB–1221 ................................................................ 11104282 .......................... 0.014 g .......................... 0.03 g 122 PCB–1232 ................................................................ 11141165 .......................... 0.014 g .......................... 0.03 g 123 PCB–1248 ................................................................ 12672296 .......................... 0.014 g .......................... 0.03 g 124 PCB–1260 ................................................................ 11096825 .......................... 0.014 g .......................... 0.03 g 125a PCB–1016 ................................................................ 12674112 .......................... 0.014 g .......................... 0.03 g 125b Polychlorinated biphenyls 

(PCBs) ................................................................... .......................... .......................... .......................... .......................... .......................... 0.00017 q 0.00017 q 

126 Toxaphene ................................................................ 8001352 0.73 0.0002 0.21 0.0002 0.00073 ac 0.00075 ac 

Total Number of Criteria (h) = ............................... .......................... 24 29 23 27 85 84 


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Environmental Protection Agency § 131.36 

FOOTNOTES

a. Criteria revised to reflect current agency q1* or RfD, as contained in the Integrated 

Risk Information System (IRIS). The fish 

tissue bioconcentration factor (BCF) from 

the 1980 criteria documents was retained in 

all cases. 

b. The criteria refers to the inorganic form 

only. 

c. Criteria in the matrix based on carcinogenicity (10¥6 risk). For a risk level of 10¥5, 

move the decimal point in the matrix value 

one place to the right. 

d. Criteria Maximum Concentration (CMC) 

= the highest concentration of a pollutant to 

which aquatic life can be exposed for a short 

period of time (1-hour average) without deleterious effects. Criteria Continuous Concentration (CCC) = the highest concentration 

of a pollutant to which aquatic life can be 

exposed for an extended period of time (4 

days) without deleterious effects. μg/L = 

micrograms per liter. 

e. Freshwater aquatic life criteria for these 

metals are expressed as a function of total 

hardness (mg/L as CaCO3), the pollutant’s 

water effect ratio (WER) as defined in 

§131.36(c) and multiplied by an appropriate 

dissolved conversion factor as defined in 

§131.36(b)(2). For comparative purposes, the 

values displayed in this matrix are shown as 

dissolved metal and correspond to a total 

hardness of 100 mg/L and a water effect ratio 

of 1.0. 

f. Freshwater aquatic life criteria for 

pentachlorophenol are expressed as a function of pH, and are calculated as follows. 

Values displayed above in the matrix correspond to a pH of 7.8. 

CMC = exp(1.005(pH)¥4.830) 

CCC = exp(1.005(pH)¥5.290) 

g. Aquatic life criteria for these compounds were issued in 1980 utilizing the 1980 

Guidelines for criteria development. The 

acute values shown are final acute values 

(FAV) which by the 1980 Guidelines are instantaneous values as contrasted with a CMC 

which is a one-hour average. 

h. These totals simply sum the criteria in 

each column. For aquatic life, there are 31 

priority toxic pollutants with some type of 

freshwater or saltwater, acute or chronic criteria. For human health, there are 85 priority toxic pollutants with either ‘‘water + 

fish’’ or ‘‘fish only’’ criteria. Note that these 

totals count chromium as one pollutant even 

though EPA has developed criteria based on 

two valence states. In the matrix, EPA has 

assigned numbers 5a and 5b to the criteria 

for chromium to reflect the fact that the list 

of 126 priority toxic pollutants includes only 

a single listing for chromium. 

i. If the CCC for total mercury exceeds 

0.012 μg/l more than once in a 3-year period in 

the ambient water, the edible portion of 

aquatic species of concern must be analyzed 

to determine whether the concentration of 

methyl mercury exceeds the FDA action 

level (1.0 mg/kg). If the FDA action level is 

exceeded, the State must notify the appropriate EPA Regional Administrator, initiate 

a revision of its mercury criterion in its 

water quality standards so as to protect designated uses, and take other appropriate action such as issuance of a fish consumption 

advisory for the affected area. 

j. No criteria for protection of human 

health from consumption of aquatic organisms (excluding water) was presented in the 

1980 criteria document or in the 1986 Quality 

Criteria for Water. Nevertheless, sufficient 

information was presented in the 1980 document to allow a calculation of a criterion, 

even though the results of such a calculation 

were not shown in the document. 

k. The criterion for asbestos is the MCL (56 

FR 3526, January 30, 1991). 

l. [Reserved: This letter not used as a footnote.] 

m. Criteria for these metals are expressed 

as a function of the water effect ratio, WER, 

as defined in 40 CFR 131.36(c). 

CMC = column B1 or C1 value × WER 

CCC = column B2 or C2 value × WER 

n. EPA is not promulgating human health 

criteria for this contaminant. However, permit authorities should address this contaminant in NPDES permit actions using the 

State’s existing narrative criteria for toxics. 

o. [Reserved: This letter not used as a footnote.] 

p. Criterion expressed as total recoverable. 

q. This criterion applies to total PCBs (e.g., 

the sum of all congener or isomer or homolog or Aroclor analyses). 

GENERAL NOTES

1. This chart lists all of EPA’s priority 

toxic pollutants whether or not criteria recommendations are available. Blank spaces 

indicate the absence of criteria recommendations. Because of variations in chemical nomenclature systems, this listing of toxic pollutants does not duplicate the listing in Appendix A of 40 CFR Part 423. EPA has added 

the Chemical Abstracts Service (CAS) registry numbers, which provide a unique identification for each chemical. 

2. The following chemicals have 

organoleptic based criteria recommendations 

that are not included on this chart (for reasons which are discussed in the preamble): 

copper, zinc, chlorobenzene, 2-chlorophenol, 

2,4-dichlorophenol, acenaphthene, 2,4- 

dimethylphenol, 3-methyl-4-chlorophenol, 

hexachlorocyclopentadiene, 

pentachlorophenol, phenol. 

3. For purposes of this rulemaking, freshwater criteria and saltwater criteria apply as 

specified in 40 CFR 131.36(c). 

NOTE TO PARAGRAPH (b)(1): On April 14, 

1995, the Environmental Protection Agency 


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§ 131.36 40 CFR Ch. I (7–1–10 Edition) 

issued a stay of certain criteria in paragraph 

(b)(1) of this section as follows: the criteria 

in columns B and C for arsenic, cadmium, 

chromium (VI), copper, lead, nickel, silver, 

and zinc; the criteria in B1 and C1 for mercury; the criteria in column B for chromium 

(III); and the criteria in column C for selenium. The stay remains in effect until further notice. 

(2) Factors for Calculating Hardness-Dependent, Freshwater Metals Criteria 

CMC=WER exp { mA[ln(hardness)]+bA} × 

Acute Conversion Factor 

CCC=WER exp { mC[ln(hardness)]+bC} × 

Chronic Conversion Factor 

Final CMC and CCC values should be rounded 

to two significant figures. 

Metal mA bA mC bC

Freshwater conversion 

factors 

Acute Chronic 

Cadmium ............................................... 1.128 –3.828 0.7852 –3.490 a 0.944 a 0.909 

Chromium (III) ....................................... 0.8190 3.688 0.8190 1.561 0.316 0.860 

Copper .................................................. 0.9422 –1.464 0.8545 –1.465 0.960 0.960 

Lead ...................................................... 1.273 -1.460 1.273 –4.705 a 0.791 a 0.791 

Nickel .................................................... 0.8460 3.3612 0.8460 1.1645 0.998 0.997 

Silver ..................................................... 1.72 –6.52 b N/A b N/A 0.85 b N/A 

Zinc ....................................................... 0.8473 0.8604 0.8473 0.7614 0.978 0.986 

Note to table: The term ‘‘exp’’ represents the base e exponential function. 

Footnotes to table: 

aThe freshwater conversion factors (CF) for cadmium and lead are hardness-dependent and can be calculated for any hardness [see limitations in § 131.36(c)(4)] using the following equations: 

Cadmium 

Acute: CF=1.136672—[(ln hardness)(0.041838)] 

Chronic: CF=1.101672—[(ln hardness)(0.041838)] 

Lead (Acute and Chronic): CF = 1.46203—[(ln hardness)(0.145712)] 

b No chronic criteria are available for silver. 

(c) Applicability. (1) The criteria in paragraph (b) of this section apply to the States’ 

designated uses cited in paragraph (d) of this 

section and supersede any criteria adopted 

by the State, except when State regulations 

contain criteria which are more stringent for 

a particular use in which case the State’s 

criteria will continue to apply. 

(2) The criteria established in this section 

are subject to the State’s general rules of applicability in the same way and to the same 

extent as are the other numeric toxics criteria when applied to the same use classifications including mixing zones, and low 

flow values below which numeric standards 

can be exceeded in flowing fresh waters. 

(i) For all waters with mixing zone regulations or implementation procedures, the criteria apply at the appropriate locations 

within or at the boundary of the mixing 

zones; otherwise the criteria apply throughout the waterbody including at the end of 

any discharge pipe, canal or other discharge 

point. 

(ii) A State shall not use a low flow value 

below which numeric standards can be exceeded that is less stringent than the following for waters suitable for the establishment of low flow return frequencies (i.e., 

streams and rivers): 

AQUATIC LIFE

Acute criteria (CMC) 1 Q 10 or 1 B 3 

Chronic criteria 

(CCC) 

7 Q 10 or 4 B 3 

HUMAN HEALTH

Non-carcinogens 30 Q 5 

Carcinogens Harmonic mean flow 

Where: 

CMC—criteria maximum concentration—the 

water quality criteria to protect against 

acute effects in aquatic life and is the 

highest instream concentration of a priority toxic pollutant consisting of a onehour average not to be exceeded more than 

once every three years on the average; 

CCC—criteria continuous concentration—the 

water quality criteria to protect against 

chronic effects in aquatic life is the highest instream concentration of a priority 

toxic pollutant consisting of a 4-day average not to be exceeded more than once 

every three years on the average; 

1 Q 10 is the lowest one day flow with an average recurrence frequency of once in 10 

years determined hydrologically; 

1 B 3 is biologically based and indicates an 

allowable exceedence of once every 3 years. 

It is determined by EPA’s computerized 

method (DFLOW model); 

7 Q 10 is the lowest average 7 consecutive day 

low flow with an average recurrence frequency of once in 10 years determined 

hydrologically; 

4 B 3 is biologically based and indicates an 

allowable exceedence for 4 consecutive 

days once every 3 years. It is determined 

by EPA’s computerized method (DFLOW 

model); 

30 Q 5 is the lowest average 30 consecutive 

day low flow with an average recurrence 

frequency of once in 5 years determined 

hydrologically; and the harmonic mean 


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Environmental Protection Agency § 131.36 

flow is a long term mean flow value calculated by dividing the number of daily 

flows analyzed by the sum of the reciprocals of those daily flows. 

(iii) If a State does not have such a 

low flow value for numeric standards 

compliance, then none shall apply and 

the criteria included in paragraph (d) 

of this section herein apply at all 

flows. 

(3) The aquatic life criteria in the 

matrix in paragraph (b) of this section 

apply as follows: 

(i) For waters in which the salinity is 

equal to or less than 1 part per thousand 95% or more of the time, the applicable criteria are the freshwater criteria in Column B; 

(ii) For waters in which the salinity 

is equal to or greater than 10 parts per 

thousand 95% or more of the time, the 

applicable criteria are the saltwater 

criteria in Column C; and 

(iii) For waters in which the salinity 

is between 1 and 10 parts per thousand 

as defined in paragraphs (c)(3) (i) and 

(ii) of this section, the applicable criteria are the more stringent of the 

freshwater or saltwater criteria. However, the Regional Administrator may 

approve the use of the alternative 

freshwater or saltwater criteria if scientifically defensible information and 

data demonstrate that on a site-specific basis the biology of the waterbody 

is dominated by freshwater aquatic life 

and that freshwater criteria are more 

appropriate; or conversely, the biology 

of the waterbody is dominated by saltwater aquatic life and that saltwater 

criteria are more appropriate. 

(4) Application of metals criteria. (i) 

For purposes of calculating freshwater 

aquatic life criteria for metals from 

the equations in paragraph (b)(2) of 

this section, the minimum hardness allowed for use in those equations shall 

not be less than 25 mg/l, as calcium 

carbonate, even if the actual ambient 

hardness is less than 25 mg/l as calcium 

carbonate. The maximum hardness 

value for use in those equations shall 

not exceed 400 mg/l as calcium carbonate, even if the actual ambient 

hardness is greater than 400 mg/l as 

calcium carbonate. The same provisions apply for calculating the metals 

criteria for the comparisons provided 

for in paragraph (c)(3)(iii) of this section. 

(ii) The hardness values used shall be 

consistent with the design discharge 

conditions established in paragraph 

(c)(2) of this section for flows and mixing zones. 

(iii) Except where otherwise noted, 

the criteria for metals (compounds #2, 

#4–# 11, and #13, in paragraph (b) of 

this section) are expressed as dissolved 

metal. For purposes of calculating 

aquatic life criteria for metals from 

the equations in footnote m. in the criteria matrix in paragraph (b)(1) of this 

section and the equations in paragraphs (b)(2) of this section, the watereffect ratio is computed as a specific 

pollutant’s acute or chronic toxicity 

values measured in water from the site 

covered by the standard, divided by the 

respective acute or chronic toxicity 

value in laboratory dilution water. 

(d) Criteria for Specific Jurisdictions— 

(1) Rhode Island, EPA Region 1. (i) All 

waters assigned to the following use 

classifications in the Water Quality 

Regulations for Water Pollution Control adopted under Chapters 46–12, 42– 

17.1, and 42–35 of the General Laws of 

Rhode Island are subject to the criteria 

in paragraph (d)(1)(ii) of this section, 

without exception: 

6.21 Freshwater 6.22 Saltwater: 

Class A .................... Class SA 

Class B .................... Class SB 

Class C .................... Class SC 

(ii) The following criteria from the 

matrix in paragraph (b)(1) of this section apply to the use classifications 

identified in paragraph (d)(1)(i) of this 

section: 

Use classification Applicable criteria 

Class A ..................................

Class B waters where water 

supply use is designated 

These classifications are assigned the criteria in Column D1—#2, 68 

Class B waters where water 

supply use is not designated.

Class C; 

Class SA; 

Class SB; 

Class SC 

Each of these classifications 

is assigned the criteria in: 

Column D2—#2, 68 

(iii) The human health criteria shall 

be applied at the 10¥5 risk level, consistent with the State policy. To determine appropriate value for carcinogens, see footnote c in the criteria matrix in paragraph (b)(1) of this section. 


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§ 131.36 40 CFR Ch. I (7–1–10 Edition) 

(2) Vermont, EPA Region 1. (i) All waters assigned to the following use classifications in the Vermont Water Quality Standards adopted under the authority of the Vermont Water Pollution Control Act (10 V.S.A., Chapter 47) 

are subject to the criteria in paragraph 

(d)(2)(ii) of this section, without exception: 

Class A 

Class B 

Class C 

(ii) The following criteria from the 

matrix in paragraph (b)(1) of this section apply to the use classifications 

identified in paragraph (d)(2)(i) of this 

section: 

Use classification Applicable criteria 

1. Classes A1, A2, B1, B2, B3 .................................................... These classification are assigned the criterion in: 

Column B2—#105. 

(iii) The human health criteria shall 

be applied at the State-proposed 10¥6

risk level. 

(3) New Jersey, EPA Region 2. (i) All 

waters assigned to the following use 

classifications in the New Jersey Administrative Code (N.J.A.C.) 7:9–4.1 et 

seq., Surface Water Quality Standards, 

are subject to the criteria in paragraph 

(d)(3)(ii) of this section, without exception. 

N.J.A.C. 7:9–4.12(b): Class PL 

N.J.A.C. 7:9–4.12(c): Class FW2 

N.J.A.C. 7:9–4.12(d): Class SE1 

N.J.A.C. 7:9–4.12(e): Class SE2 

N.J.A.C. 7:9–4.12(f): Class SE3 

N.J.A.C. 7:9–4.12(g): Class SC 

N.J.A.C. 7:9–4.13(a): Delaware River Zones 1C, 

1D, and 1E 

N.J.A.C. 7:9–4.13(b): Delaware River Zone 2 

N.J.A.C. 7:9–4.13(c): Delaware River Zone 3 

N.J.A.C. 7:9–4.13(d): Delaware River Zone 4 

N.J.A.C. 7:9–4.13(e): Delaware River Zone 5 

N.J.A.C. 7:9–4.13(f): Delaware River Zone 6 

(ii) The following criteria from the 

matrix in paragraph (b)(1) of this section apply to the use classifications 

identified in paragraph (d)(3)(i) of this 

section: 

Use classification Applicable criteria 

1. Freshwater Pinelands, FW2 .................................................... These classifications are each assigned the criteria in: 

i. Column B1—#2, 4, 5a, 5b, 6–11, 13. 

ii. Column B2—#2, 4, 5a, 5b, 6–10, 13. 

iii. Column D1—#125b at a 10¥6 risk level. 

iv. Column D2—#125b at a 10¥6 risk level. 

v. Column D2—#23, 30, 37, 42, 87, 89, 93 and 105 at a 10¥5

risk level. 

2. PL (Saline Water Pinelands), SE1, SE2, SE3, SC, Delaware 

Bay Zone 6.

These classifications are each assigned the criteria in: 

i. Column C1—#2, 4, 5b, 6–11, 13. 

ii. Column C2—#2, 4, 5b, 6–10, 13. 

iii. Column D1—#125b at a 10¥6 risk level. 

iv. Column D2—#125b at a 10¥6 risk level. 

v. Column D2—#23, 30, 37, 42, 87, 89, 93 and 105 at a 10¥5

risk level. 

3. Delaware River Zones 1C, 1D, 1E, 2, 3, 4, and 5 ................. i. Column B1—none. 

ii. Column B2—none. 

iii. Column D1—none. 

iv. Column D2—none. 

4. Delaware River Zones 3, 4, and 5 .......................................... These classifications are each assigned the criteria in: 

i. Column C1—none. 

ii. Column C2—none. 

iii. Column D2—none. 

(iii) The human health criteria shall 

be applied at the State-proposed 10¥6

risk level for EPA rated Class A, B1, 

and B2 carcinogens; EPA rated Class C 

carcinogens shall be applied at 10¥5

risk level. To determine appropriate 

value for carcinogens, see footnote c. in 

the matrix in paragraph (b)(1) of this 

section. 

(4) Puerto Rico, EPA Region 2. (i) All 

waters assigned to the following use 

classifications in the Puerto Rico 


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Environmental Protection Agency § 131.36 

Water Quality Standards (promulgated 

by Resolution Number R–83–5–2) are 

subject to the criteria in paragraph 

(d)(4)(ii) of this section, without 

exception. 

Article 2.2.2—Class SB 

Article 2.2.3—Class SC 

Article 2.2.4—Class SD 

(ii) The following criteria from the 

matrix in paragraph (b)(1) of this section apply to the use classifications 

identified in paragraph (d)(4)(i) of this 

section: 

Use classification Applicable criteria 

Class SD ...................................................................................... Column B1—# 118. 

Column B2—#s 8, 105, 115, 118, 119, 120, 121, 122, 123,124, 

125a, 125b. 

Column D1—#s 12, 16, 27, 60, 61, 62, 64, 73, 74, 92, 93, 103, 

104, 114, 116, 118, 119, 120, 121, 122, 123, 124, 125a, 

125b. 

Class SB, Class SC .................................................................... Column C1—#s 5b, 112, 113, 118. 

Column C2—#s 5b, 8, 112, 113, 118, 119, 120, 121, 122, 123, 

124, 125a, 125b. 

Column D2—#s 12, 16, 27, 60, 61, 62, 64, 73, 74, 87, 92, 93, 

103, 104, 114, 116, 118, 119, 120, 121, 122, 123, 124, 

125a, 125b. 

(iii) The human health criteria shall 

be applied at the State-proposed 10¥5

risk level. To determine appropriate 

value for carcinogens, see footnote c, in 

the criteria matrix in paragraph (b)(1) 

of this section. 

(5) District of Columbia, EPA Region 3. 

(i) All waters assigned to the following 

use classifications in chapter 11 Title 

21 DCMR, Water Quality Standards of 

the District of Columbia are subject to 

the criteria in paragraph (d)(5)(ii) of 

this section, without exception: 

1101.2 Class C waters 

(ii) The following criteria from the 

matrix in paragraph (b)(1) of this section apply to the use classification 

identified in paragraph (d)(5)(i) of this 

section: 

Use classification Applicable criteria 

1. Class C .................................................................................... This classification is assigned the additional criteria in: 

Column B2; #10, 118, 126. 

(iii) The human health criteria shall 

be applied at the State-adopted 10¥6

risk level. 

(6) Florida, EPA Region 4. (i) All waters assigned to the following use classifications in Chapter 17–301 of the 

Florida Administrative Code (i.e., identified in Section 17–302.600) are subject 

to the criteria in paragraph (d)(6)(ii) of 

this section, without exception: 

Class I 

Class II 

Class III 

(ii) The following criteria from the 

matrix paragraph (b)(1) of this section 

apply to the use classifications identified in paragraph (d)(6)(i) of this section: 

Use classification Applicable criteria 

Class I .......................................................................................... This classification is assigned the criteria in: 

Column D1—#16 

Class II .........................................................................................

Class III (marine) .........................................................................

This classification is assigned the criteria in: 

Column D2—#16 

Class III (freshwater) ................................................................... This classification is assigned the criteria in: 

Column D2—#16 


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§ 131.36 40 CFR Ch. I (7–1–10 Edition) 

(iii) The human health criteria shall 

be applied at the State-adopted 10¥6

risk level. 

(7)–(8) [Reserved] 

(9) Kansas, EPA Region 7. (i) All waters assigned to the following use classification in the Kansas Department of 

Health and Environment regulations, 

K.A.R. 28–16–28b through K.A.R. 28–16– 

28f, are subject to the criteria in paragraph (d)(9)(ii) of this section, without 

exception. 

Section (2)(A)—Special Aquatic Life Use Waters 

Section (2)(B)—Expected Aquatic Life Use 

Waters 

Section (2)(C)—Restricted Aquatic Life Use 

Waters 

Section (3)—Domestic Water Supply. 

Section (4)—Food Procurement Use. 

(ii) The following criteria from the 

matrix in paragraph (b)(1) of this section apply to the use classifications 

identified in paragraph (d)(9)(i) of this 

section: 

Use classification Applicable criteria 

1. Sections (2)(A), (2)(B), (2)(C), (4) ........................................... These classifications are each assigned criteria as follows: 

i. Column B1, #2. 

ii. Column D2, #12, 21, 29, 39, 46, 68, 79, 81, 86, 93, 104, 

114, 118. 

2. Section (3) ............................................................................... This classification is assigned all criteria in: 

Column D1, all except #1, 9, 12, 14, 15, 17, 22, 33, 36, 39, 44, 

75, 77, 79, 90, 112, 113, and 115. 

(iii) The human health criteria shall 

be applied at the State-adopted 10¥6

risk level. 

(10) California, EPA Region 9. (i) All 

waters assigned any aquatic life or 

human health use classifications in the 

Water Quality Control Plans for the 

various Basins of the State (‘‘Basin 

Plans’’), as amended, adopted by the 

California State Water Resources Control Board (‘‘SWRCB’’), except for 

ocean waters covered by the Water 

Quality Control Plan for Ocean Waters 

of California (‘‘Ocean Plan’’) adopted 

by the SWRCB with resolution Number 

90–27 on March 22, 1990, are subject to 

the criteria in paragraph (d)(10)(ii) of 

this section, without exception. These 

criteria amend the portions of the existing State standards contained in the 

Basin Plans. More particularly these 

criteria amend water quality criteria 

contained in the Basin Plan Chapters 

specifying water quality objectives 

(the State equivalent of federal water 

quality criteria) for the toxic pollutants identified in paragraph (d)(10)(ii) 

of this section. Although the State has 

adopted several use designations for 

each of these waters, for purposes of 

this action, the specific standards to be 

applied in paragraph (d)(10)(ii) of this 

section are based on the presence in all 

waters of some aquatic life designation 

and the presence or absence of the 

MUN use designation (Municipal and 

domestic supply). (See Basin Plans for 

more detailed use definitions.) 

(ii) The following criteria from the 

matrix in paragraph (b)(1) of this section apply to the water and use classifications defined in paragraph (d)(10)(i) 

of this section and identified below: 

Water and use classification Applicable criteria 

Waters of the State defined as bays or estuaries except the 

Sacramento-San Joaquin Delta and San Francisco Bay 

These waters are assigned the 

criteria in: 

Column B1—pollutants 5a 

and 14 

Column B2—pollutants 5a 

and 14 

Column C1—pollutant 14 

Column C2—pollutant 14 

Column D2—pollutants 1, 

12, 17, 18, 21, 22, 29, 30, 32, 

33, 37, 38, 42–44, 46, 48, 49, 

54, 59, 66, 67, 68, 78–82, 85, 

89, 90, 91, 93, 95, 96, 98 


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Environmental Protection Agency § 131.36 

Water and use classification Applicable criteria 

Waters of the Sacramento—San Joaquin Delta and waters of 

the State defined as inland (i.e., all surface waters of the 

State not bays or estuaries or ocean) that include a MUN 

use designation 

These waters are assigned the 

criteria in: 

Column B1—pollutants 5a 

and 14 

Column B2—pollutants 5a 

and 14 

Column D1—pollutants 1, 

12, 15, 17, 18, 21, 22, 29, 30, 

32, 33, 37, 38, 42–48, 49, 59, 

66, 67, 68, 78–82, 85, 89, 90, 

91, 93, 95, 96, 98 

Waters of the State defined as inland without an MUN use 

designation 

These waters are assigned the 

criteria in: 

Column B1—pollutants 5a 

and 14 

Column B2—pollutants 5a 

and 14 

Column D2—pollutants 1, 

12, 17, 18, 21, 22, 29, 30, 32, 

33, 37, 38, 42–44, 46, 48, 49, 

54, 59, 66, 67, 68, 78–82, 85, 

89, 90, 91, 93, 95, 96, 98 

Waters of the San Joaquin River from the mouth of the 

Merced River to Vernalis 

In addition to the criteria assigned to these waters elsewhere in this rule, these waters are assigned the criteria in: 

Column B2—pollutant 10 

Waters of Salt Slough, Mud Slough (north) and the San Joaquin River, Sack Dam to the mouth of the Merced River In addition to the criteria assigned to these waters elsewhere in this rule, these waters are assigned the criteria in: 

Column B1—pollutant 10 

Column B2—pollutant 10 

Waters of San Francisco Bay upstream to and including 

Suisun Bay and the Sacramento-San Joaquin Delta 

These waters are assigned the 

criteria in: 

Column B1—pollutants 5a, 

10* and 14 

Column B2—pollutants 5a, 

10* and 14 

Column C1—pollutant 14 

Column C2—pollutant 14 

Column D2—pollutants 1, 

12, 17, 18, 21, 22, 29, 30, 32, 

33, 37, 38, 42–44, 46, 48, 49, 

54, 59, 66, 67, 68, 78–82, 85, 

89, 90, 91, 93, 95, 96, 98 

All inland waters of the United States or enclosed bays and 

estuaries that are waters of the United States that include 

an MUN use designation and that the State has either excluded or partially excluded from coverage under its Water 

Quality Control Plan for Inland Surface Waters of California, Tables 1 and 2, or its Water Quality Control Plan 

for Enclosed Bays and Estuaries of California, Tables 1 and 

2, or has deferred applicability of those tables. (Category 

(a), (b), and (c) waters described on page 6 of Water Quality 

Control Plan for Inland Surface Waters of California or 

page 6 of its Water Quality Control Plan for Enclosed Bays 

and Estuaries of California.) 

These waters are assigned the 

criteria for pollutants for 

which the State does not 

apply Table 1 or 2 standards. These criteria are: 

Column B1—all pollutants 

Column B2—all pollutants 

Column D1—all pollutants 

except #2 


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§ 131.36 40 CFR Ch. I (7–1–10 Edition) 

Water and use classification Applicable criteria 

All inland waters of the United States that do not include an 

MUN use designation and that the State has either excluded or partially excluded from coverage under its Water 

Quality Control Plan for Inland Surface Waters of California, Tables 1 and 2, or has deferred applicability of these 

tables. (Category (a), (b), and (c) waters described on page 6 

of Water Quality Control Plan for Inland Surface Waters of 

California.) 

These waters are assigned the 

criteria for pollutants for 

which the State does not 

apply Table 1 or 2 standards. These criteria are: 

Column B1—all pollutants 

Column B2—all pollutants 

Column D2—all pollutants 

except #2 

All enclosed bays and estuaries that are waters of the United 

States that do not include an MUN designation and that 

the State has either excluded or partially excluded from 

coverage under its Water Quality Control Plan for Inland 

Surface Waters of California, Tables 1 and 2, or its Water 

Quality Control Plan for Enclosed Bays and Estuaries of 

California, Tables 1 and 2, or has deferred applicability of 

those tables. (Category (a), (b), and (c) waters described on 

page 6 of Water Quality Control Plan for Inland Surface 

Waters of California or page 6 of its Water Quality Control 

Plan for Enclosed Bays and Estuaries of California.) 

These waters are assigned the 

criteria for pollutants for 

which the State does not 

apply Table 1 or 2 standards. These criteria are: 

Column B1—all pollutants 

Column B2—all pollutants 

Column C1—all pollutants 

Column C2—all pollutants 

Column D2—all pollutants 

except #2 

*The fresh water selenium criteria are included for the San Francisco Bay estuary because 

high levels of bioaccumulation of selenium in the estuary indicate that the salt water criteria are underprotective for San Francisco Bay. 

(iii) The human health criteria shall 

be applied at the State-adopted 10¥6

risk level. 

(11) Nevada, EPA Region 9. (i) All waters assigned the use classifications in 

Chapter 445 of the Nevada Administrative Code (NAC), Nevada Water Pollution Control Regulations, which are referred to in paragraph (d)(11)(ii) of this 

section, are subject to the criteria in 

paragraph (d)(11)(ii) of this section, 

without exception. These criteria 

amend the existing State standards 

contained in the Nevada Water Pollution Control Regulations. More particularly, these criteria amend or supplement the table of numeric standards 

in NAC 445.1339 for the toxic pollutants 

identified in paragraph (d)(11)(ii) of 

this section. 

(ii) The following criteria from matrix in paragraph (b)(1) of this section 

apply to the waters defined in paragraph (d)(11)(i) of this section and identified below: 

Water and use classification Applicable criteria 

Waters that the State has included in NAC 

445.1339 where Municipal or domestic supply 

is a designated use 

These waters are assigned the criteria in: 

Column B1—pollutant #118 

Column B2—pollutant #118 

Column D1—pollutants #15, 16, 18, 19, 20, 

21, 23, 26, 27, 29, 30, 34, 37, 38, 42, 43, 55, 

58–62, 64, 66, 73, 74, 78, 82, 85, 87–89, 91, 92, 

96, 98, 100, 103, 104, 105, 114, 116, 117, 118 

Waters that the State has included in NAC 

445.1339 where Municipal or domestic supply 

is not a designated use 

These waters are assigned the criteria in: 

Column B1—pollutant #118 

Column B2—pollutant #118 

Column D2—all pollutants except #2. 

(iii) The human health criteria shall 

be applied at the 10¥5 risk level, consistent with State policy. To determine 

appropriate value for carcinogens, see 

footnote c in the criteria matrix in 

paragraph (b)(1) of this section. 

(12) Alaska, EPA Region 10. (i) All waters assigned to the following use classifications in the Alaska Administrative Code (AAC), Chapter 18 (i.e., identified in 18 AAC 70.020) are subject to 

the criteria in paragraph (d)(12)(ii) of 

this section, without exception: 


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Environmental Protection Agency § 131.37 

70.020.(1) (A) Fresh Water 

70.020.(1) (A) Water Supply 

(i) Drinking, culinary, and food processing, 

(iii) Aquaculture; 

70.020.(1) (B) Water Recreation 

(i) Contact recreation, 

(ii) Secondary recreation; 

70.020.(1) (C) Growth and propagation of 

fish, shellfish, other aquatic life, and 

wildlife 

70.020.(2) (A) Marine Water 

70.020.(2) (A) Water Supply 

(i) Aquaculture, 

70.020.(2) (B) Water Recreation 

(i) contact recreation, 

(ii) secondary recreation; 

70.020.(2) (C) Growth and propagation of fish, 

shellfish, other aquatic life, and wildlife; 

70.020.(2) (D) Harvesting for consumption of 

raw mollusks or other raw aquatic life. 

(ii) The following criteria from the 

matrix in paragraph (b)(1) of this section apply to the use classifications 

identified in paragraph (d)(12)(i) of this 

section: 

Use classification Applicable criteria 

(1)(A)(i) ........................................................................................ Column D1—#s 16, 18–21, 23, 26, 27, 29, 30, 32, 37, 38, 42– 

44, 53, 55, 59–62, 64, 66, 68, 73, 74, 78, 82, 85, 88, 89, 

91–93, 96, 98, 102–105, 107–111, 117–126. 

(1)(A)(iii) ....................................................................................... Column D2—#s 14, 16, 18–21, 22, 23, 26, 27, 29, 30, 32, 37, 

38, 42–44, 46, 53, 54, 55, 59–62, 64, 66, 68, 73, 74, 78, 82, 

85, 88–93, 95, 96, 98, 102–105, 107–111, 115–126. 

(1)(B)(i), (1)(B)(ii), (1)(C) ............................................................. Column D2—#s 14, 16, 18–21, 22, 23, 26, 27, 29, 30, 32, 37, 

38, 42–44, 46, 53, 54, 55, 59–62, 64, 66, 68, 73, 74, 78, 82, 

85, 88–93, 95, 96, 98, 102–105, 107–111, 115–126. 

(2)(A)(i), (2)(B)(i), and (2)(B)ii, (2)(C), (2)(D) .............................. Column D2—#s 14, 16, 18–21, 22, 23, 26, 27, 29, 30, 32, 37, 

38, 42–44, 46, 53, 54, 55, 59–62, 64, 66, 68, 73, 74, 78, 82, 

85, 88–93, 95, 96, 98, 102–105, 107–111, 115–126. 

(iii) The human health criteria shall 

be applied at the State-proposed risk 

level of 10¥5. To determine appropriate 

value for carcinogens, see footnote c in 

the criteria matrix in paragraph (b)(1) 

of this section. 

(13) [Reserved] 

(14) Washington, EPA Region 10. (i) All 

waters assigned to the following use 

classifications in the Washington Administrative Code (WAC), Chapter 173– 

201 (i.e., identified in WAC 173–201–045) 

are subject to the criteria in paragraph 

(d)(14)(ii) of this section, without exception: 

173–201–045 

Fish and Shellfish 

Fish 

Water Supply (domestic) 

Recreation 

(ii) The following criteria from the 

matrix in paragraph (b)(1) of this section apply to the use classifications 

identified in paragraph (d)(14)(i) of this 

section: 

Use classification Applicable criteria 

Fish and Shellfish; Fish ............................................................... These classifications are assigned the criteria in: Column D2— 

all. 

Water Supply (domestic) ............................................................. These classifications are assigned the criteria in: Column D1— 

all. 

Recreation ................................................................................... This classification is assigned the criteria in: Column D2—Marine waters and freshwaters not protected for domestic water 

supply. 

(iii) The human health criteria shall 

be applied at the State proposed risk 

level of 10¥6. 

[57 FR 60910, Dec. 22, 1992] 

EDITORIAL NOTE: For FEDERAL REGISTER citations affecting §131.36, see the List of CFR 

Sections Affected, which appears in the 

Finding Aids section of the printed volume 

and on GPO Access. 

§ 131.37 California. 

(a) Additional criteria. The following 

criteria are applicable to waters specified in the Water Quality Control Plan 

for Salinity for the San Francisco Bay/ 

Sacramento-San Joaquin Delta Estuary, adopted by the California State 

Water Resources Control Board in 

State Board Resolution No. 91–34 on 

May 1, 1991: 


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