{"data":{"id":"us/40-cfr-131.36","jurisdiction":"us","citation":"40 CFR 131.36","heading":"Toxics criteria for those states not complying with Clean Water Act section 303(c)(2)(B).","body":"(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.\n(b)(1) EPA's Section 304(a) criteria for Priority Toxic Pollutants.\nA B Freshwater C Saltwater D Human Health (10−6 risk for carcinogens) For consumption of:\n(#) 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 \u0026 Organisms (µg/L) (D1) Organisms Only (µg/L) (D2)\n1 Antimony 7440360 14 a 4300 a\n2 Arsenic 7440382 360 m 190 m 69 m 36 m 0.018 abc 0.14 abc\n3 Beryllium 7440417 n n\n4 Cadmium 7440439 3.7 e 1.0 e 42 m 9.3 m n n\n5a Chromium (III) 16065831 550 e 180 e n n\nb Chromium (VI) 18540299 15 m 10 m 1100 m 50 m n n\n6 Copper 7440508 17 e 11 e 2.4 m 2.4 m\n7 Lead 7439921 65 e 2.5 e 210 m 8.1 m n n\n8 Mercury 7439976 2.1 m 0.012 ip 1.8 m 0.025 ip 0.14 0.15\n9 Nickel 7440020 1400 e 160 e 74 m 8.2 m 610 a 4600 a\n10 Selenium 7782492 20 p 5 p 290 m 71 m n n\n11 Silver 7440224 3.4 e 1.9 m\n12 Thallium 7440280 1.7 a 6.3 a\n13 Zinc 7440666 110 e 100 e 90 m 81 m\n14 Cyanide 57125 22 5.2 1 1 700 a 220000 aj\n15 Asbestos 1332214 7,000,000 fibers/L k\n16 2,3,7,8-TCDD (Dioxin) 1746016 0.000000013 c 0.000000014 c\n17 Acrolein 107028 320 780\n18 Acrylonitrile 107131 0.059 ac 0.66 ac\n19 Benzene 71432 1.2 ac 71 ac\n20 Bromoform 75252 4.3 ac 360 ac\n21 Carbon Tetrachloride 56235 0.25 ac 4.4 ac\n22 Chlorobenzene 108907 680 a 21000 aj\n23 Chlorodibromomethane 124481 0.41 ac 34 ac\n24 Chloroethane 75003\n25 2-Chloroethylvinyl Ether 110758\n26 Chloroform 67663 5.7 ac 470 ac\n27 Dichlorobromomethane 75274 0.27 ac 22 ac\n28 1,1-Dichloroethane 75343\n29 1,2-Dichloroethane 107062 0.38 ac 99 ac\n30 1,1-Dichloroethylene 75354 0.057 ac 3.2 ac\n31 1,2-Dichloropropane 78875\n32 1,3-Dichloropropylene 542756 10 a 1700 a\n33 Ethylbenzene 100414 3100 a 29000 a\n34 Methyl Bromide 74839 48 a 4000 a\n35 Methyl Chloride 74873 n n\n36 Methylene Chloride 75092 4.7 ac 1600 ac\n37 1,1,2,2-Tetrachloroethane 79345 0.17 ac 11 ac\n38 Tetrachloroethylene 127184 0.8 c 8.85 c\n39 Toluene 108883 6800 a 200000 a\n40 1,2-Trans-Dichloroethylene 156605\n41 1,1,1-Trichloroethane 71556 n n\n42 1,1,2-Trichloroethane 79005 0.60 ac 42 ac\n43 Trichloroethylene 79016 2.7 c 81 c\n44 Vinyl Chloride 75014 2 c 525 c\n45 2-Chlorophenol 95578\n46 2,4-Dichlorophenol 120832 93 a 790 aj\n47 2,4-Dimethylphenol 105679\n48 2-Methyl-4,6-Dinitrophenol 534521 13.4 765\n49 2,4-Dinitrophenol 51285 70 a 14000 a\n50 2-Nitrophenol 88755\n51 4-Nitrophenol 100027\n52 3-Methyl-4-Chlorophenol 59507\n53 Pentachlorophenol 87865 20 f 13 f 13 7.9 0.28 ac 8.2 acj\n54 Phenol 108952 21000 a 4600000 aj\n55 2,4,6-Trichlorophenol 88062 2.1 ac 6.5 ac\n56 Acenaphthene 83329\n57 Acenaphthylene 208968\n58 Anthracene 120127 9600 a 110000 a\n59 Benzidine 92875 0.00012 ac 0.00054 ac\n60 Benzo(a)Anthracene 56553 0.0028 c 0.031 c\n61 Benzo(a)Pyrene 50328 0.0028 c 0.031 c\n62 Benzo(b)Fluoranthene 205992 0.0028 c 0.031 c\n63 Benzo(ghi)Perylene 191242\n64 Benzo(k)Fluoranthene 207089 0.0028 c 0.031 c\n65 Bis(2-Chloroethoxy)Methane 111911\n66 Bis(2-Chloroethyl)Ether 111444 0.031 ac 1.4 ac\n67 Bis(2-Chloroisopropyl)Ether 108601 1400 a 170000 a\n68 Bis(2-Ethylhexyl)Phthalate 117817 1.8 ac 5.9 ac\n69 4-Bromophenyl Phenyl Ether 101553\n70 Butylbenzyl Phthalate 85687\n71 2-Chloronaphthalene 91587\n72 4-Chlorophenyl Phenyl Ether 7005723\n73 Chrysene 218019 0.0028 c 0.031 c\n74 Dibenzo(ah)Anthracene 53703 0.0028 c 0.031 c\n75 1,2-Dichlorobenzene 95501 2700 a 17000 a\n76 1,3-Dichlorobenzene 541731 400 2600\n77 1,4-Dichlorobenzene 106467 400 2600\n78 3,3′-Dichlorobenzidine 91941 0.04 ac 0.077 ac\n79 Diethyl Phthalate 84662 23000 a 120000 a\n80 Dimethyl Phthalate 131113 313000 2900000\n81 Di-n-Butyl Phthalate 84742 2700 a 12000 a\n82 2,4-Dinitrotoluene 121142 0.11 c 9.1 c\n83 2,6-Dinitrotoluene 606202\n84 Di-n-Octyl Phthalate 117840\n85 1,2-Diphenylhydrazine 122667 0.040 ac 0.54 ac\n86 Fluoranthene 206440 300 a 370 a\n87 Fluorene 86737 1300 a 14000 a\n88 Hexachlorobenzene 118741 0.00075 ac 0.00077 ac\n89 Hexachlorobutadiene 87683 0.44 ac 50 ac\n90 Hexachlorocyclopentadiene 77474 240 a 17000 aj\n91 Hexachloroethane 67721 1.9 ac 8.9 ac\n92 Indeno(1,2,3-cd)Pyrene 193395 0.0028 c 0.031 c\n93 Isophorone 78591 8.4 ac 600 ac\n94 Naphthalene 91203\n95 Nitrobenzene 98953 17 a 1900 aj\n96 N-Nitrosodimethylamine 62759 0.00069 ac 8.1 ac\n97 N-Nitrosodi-n-Propylamine 621647\n98 N-Nitrosodiphenylamine 86306 5.0 ac 16 ac\n99 Phenanthrene 85018\n100 Pyrene 129000 960 a 11000 a\n101 1,2,4-Trichlorobenzene 120821\n102 Aldrin 309002 3 g 1.3 g 0.00013 ac 0.00014 ac\n103 alpha-BHC 319846 0.0039 ac 0.013 ac\n104 beta-BHC 319857 0.014 ac 0.046 ac\n105 gamma-BHC 58899 2 g 0.08 g 0.16 g 0.019 c 0.063 c\n106 delta-BHC 319868\n107 Chlordane 57749 2.4 g 0.0043 g 0.09 g 0.004 g 0.00057 ac 0.00059 ac\n108 4,4′-DDT 50293 1.1 g 0.001 g 0.13 g 0.001 g 0.00059 ac 0.00059 ac\n109 4,4′-DDE 72559 0.00059 ac 0.00059 ac\n110 4,4′-DDD 72548 0.00083 ac 0.00084 ac\n111 Dieldrin 60571 2.5 g 0.0019 g 0.71 g 0.0019 g 0.00014 ac 0.00014 ac\n112 alpha-Endosulfan 959988 0.22 g 0.056 g 0.034 g 0.0087 g 0.93 a 2.0 a\n113 beta-Endosulfan 33213659 0.22 g 0.056 g 0.034 g 0.0087 g 0.93 a 2.0 a\n114 Endosulfan Sulfate 1031078 0.93 a 2.0 a\n115 Endrin 72208 0.18 g 0.0023 g 0.037 g 0.0023 g 0.76 a 0.81 aj\n116 Endrin Aldehyde 7421934 0.76 a 0.81 aj\n117 Heptachlor 76448 0.52 g 0.0038 g 0.053 g 0.0036 g 0.00021 ac 0.00021 ac\n118 Heptachlor Epoxide 1024573 0.52 g 0.0038 g 0.053 g 0.0036 g 0.00010 ac 0.00011 ac\n119 PCB-1242 53469219 0.014 g 0.03 g\n120 PCB-1254 11097691 0.014 g 0.03 g\n121 PCB-1221 11104282 0.014 g 0.03 g\n122 PCB-1232 11141165 0.014 g 0.03 g\n123 PCB-1248 12672296 0.014 g 0.03 g\n124 PCB-1260 11096825 0.014 g 0.03 g\n125a PCB-1016 12674112 0.014 g 0.03 g\n125b Polychlorinated biphenyls (PCBs) 0.00017 q 0.00017 q\n126 Toxaphene 8001352 0.73 0.0002 0.21 0.0002 0.00073 ac 0.00075 ac\nTotal Number of Criteria (h) = 24 29 23 27 85 84\nFootnotes\na. 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.\nb. The criteria refers to the inorganic form only.\nc. 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.\nd. 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.\ne. 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.\nf. 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.\nCMC = exp(1.005(pH)−4.830)\nCCC = exp(1.005(pH)−5.290)\ng. 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.\nh. 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.\ni. 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.\nj. 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.\nk. The criterion for asbestos is the MCL (56 FR 3526, January 30, 1991).\nl. [Reserved: This letter not used as a footnote.]\nm. Criteria for these metals are expressed as a function of the water effect ratio, WER, as defined in 40 CFR 131.36(c).\nCMC = column B1 or C1 value × WER\nCCC = column B2 or C2 value × WER\nn. 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.\no. [Reserved: This letter not used as a footnote.]\np. Criterion expressed as total recoverable.\nq. This criterion applies to total PCBs (e.g., the sum of all congener or isomer or homolog or Aroclor analyses).\nGeneral Notes\n1. 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.\n2. 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.\n3. For purposes of this rulemaking, freshwater criteria and saltwater criteria apply as specified in 40 CFR 131.36(c).\nNote to paragraph (b)(1):\nOn April 14, 1995, the Environmental Protection Agency 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.\n(2) Factors for Calculating Hardness-Dependent, Freshwater Metals Criteria\nCMC = WER exp { mA[ln(hardness)] + bA} × Acute Conversion Factor\nCCC = WER exp { mC[ln(hardness)] + bC} × Chronic Conversion Factor\nFinal CMC and CCC values should be rounded to two significant figures.\nMetal mA bA mC bC Freshwater conversion factors\nAcute Chronic\nCadmium 1.128 -3.828 0.7852 -3.490 a 0.944 a 0.909\nChromium (III) 0.8190 3.688 0.8190 1.561 0.316 0.860\nCopper 0.9422 -1.464 0.8545 -1.465 0.960 0.960\nLead 1.273 -1.460 1.273 -4.705 a 0.791 a 0.791\nNickel 0.8460 3.3612 0.8460 1.1645 0.998 0.997\nSilver 1.72 -6.52 b N/A b N/A 0.85 b N/A\nZinc 0.8473 0.8604 0.8473 0.7614 0.978 0.986\nNote to table: The term “exp” represents the base e exponential function.\nFootnotes to table:\na The 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:\nCadmium\nAcute: CF = 1.136672—[(ln hardness)(0.041838)]\nChronic: CF = 1.101672—[(ln hardness)(0.041838)]\nLead (Acute and Chronic): CF = 1.46203—[(ln hardness)(0.145712)]\nb No chronic criteria are available for silver.\n(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.\n(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.\n(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.\n(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):\nAquatic Life\nAcute criteria (CMC) 1 Q 10 or 1 B 3\nChronic criteria (CCC) 7 Q 10 or 4 B 3\nHuman Health\nNon-carcinogens 30 Q 5\nCarcinogens Harmonic mean flow\nWhere:\nCMC—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 one-hour average not to be exceeded more than once every three years on the average;\nCCC—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;\n1 Q 10 is the lowest one day flow with an average recurrence frequency of once in 10 years determined hydrologically;\n1 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);\n7 Q 10 is the lowest average 7 consecutive day low flow with an average recurrence frequency of once in 10 years determined hydrologically;\n4 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);\n30 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 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.\n(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.\n(3) The aquatic life criteria in the matrix in paragraph (b) of this section apply as follows:\n(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;\n(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\n(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.\n(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.\n(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.\n(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 water-effect 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.\n(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:\n6.21 Freshwater 6.22 Saltwater:\nClass A Class SA\nClass B Class SB\nClass C Class SC\n(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:\nUse classification Applicable criteria\nClass A Class B waters where water supply use is designated These classifications are assigned the criteria in Column D1—#2, 68\nClass 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\n(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.\n(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:\nClass A\nClass B\nClass C\n(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:\nUse classification Applicable criteria\n1. Classes A1, A2, B1, B2, B3 These classification are assigned the criterion in: Column B2—#105.\n(iii) The human health criteria shall be applied at the State-proposed 10−6 risk level.\n(3)-(4) Reserved]\n(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:\n1101.2 Class C waters\n(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:\nUse classification Applicable criteria\n1. Class C This classification is assigned the additional criteria in: Column B2; #10, 118, 126.\n(iii) The human health criteria shall be applied at the State-adopted 10−6 risk level.\n(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:\nClass I\nClass II\nClass III\n(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:\nUse classification Applicable criteria\nClass I This classification is assigned the criteria in:\nColumn D1—#16\nClass II Class III (marine) This classification is assigned the criteria in:\nColumn D2—#16\nClass III (freshwater) This classification is assigned the criteria in:\nColumn D2—#16\n(iii) The human health criteria shall be applied at the State-adopted 10−6 risk level.\n(7)-(8) [Reserved]\n(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.\nSection (2)(A)—Special Aquatic Life Use Waters\nSection (2)(B)—Expected Aquatic Life Use Waters\nSection (2)(C)—Restricted Aquatic Life Use Waters\nSection (3)—Domestic Water Supply.\nSection (4)—Food Procurement Use.\n(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:\nUse classification Applicable criteria\n1. Sections (2)(A), (2)(B), (2)(C), (4) These classifications are each assigned criteria as follows:\ni. Column B1, #2.\nii. Column D2, #12, 21, 29, 39, 46, 68, 79, 81, 86, 93, 104, 114, 118.\n2. Section (3) This classification is assigned all criteria in:\nColumn D1, all except #1, 9, 12, 14, 15, 17, 22, 33, 36, 39, 44, 75, 77, 79, 90, 112, 113, and 115.\n(iii) The human health criteria shall be applied at the State-adopted 10−6 risk level.\n(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.)\n(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:\nWater and use classification Applicable criteria\nWaters of the Sacramento-San Joaquin Delta within Regional Water Board 5 Column C1—polluntant 14. Column C2—pollutant 14.\nWaters 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:\nColumn B1—pollutants 5a and 14\nColumn B2—pollutants 5a and 14\nColumn C1—pollutant 14\nColumn C2—pollutant 14\nColumn 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\nWaters 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\nWaters of the State defined as inland without an MUN use designation These waters are assigned the criteria in:\nColumn B1—pollutants 5a and 14\nColumn B2—pollutants 5a and 14\nColumn 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\nWaters 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:\nColumn B2—pollutant 10\nWaters 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:\nColumn B1—pollutant 10\nColumn B2—pollutant 10\nWaters 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 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.\nAll 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\nAll 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\nAll 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\n*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.\n(iii) The human health criteria shall be applied at the State-adopted 10−6 risk level.\n(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.\n(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:\nWater and use classification Applicable criteria\nWaters 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\nWaters 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.\n(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.\n(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:\n70.020.(1) (A) Fresh Water\n70.020.(1) (A) Water Supply\n(i) Drinking, culinary, and food processing,\n(iii) Aquaculture;\n70.020.(1) (B) Water Recreation\n(i) Contact recreation,\n(ii) Secondary recreation;\n70.020.(1) (C) Growth and propagation of fish, shellfish, other aquatic life, and wildlife\n70.020.(2) (A) Marine Water\n70.020.(2) (A) Water Supply\n(i) Aquaculture,\n70.020.(2) (B) Water Recreation\n(i) contact recreation,\n(ii) secondary recreation;\n70.020.(2) (C) Growth and propagation of fish, shellfish, other aquatic life, and wildlife;\n70.020.(2) (D) Harvesting for consumption of raw mollusks or other raw aquatic life.\n(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:\nUse classification Applicable criteria\n(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.\n(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.\n(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.\n(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.\n(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.\n(13) [Reserved]","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER D—WATER PROGRAMS","PART 131—WATER QUALITY STANDARDS","Subpart D—Federally Promulgated Water Quality Standards"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"734c2fa67b6f0eb696a790753e9ca0314fc83b2ab0831560759c1fe5cfaad65e","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-131.35","next":"us/40-cfr-131.37"},"notice":"GroundRules: Original legal text. Not legal advice."}