A | B Freshwater | C Saltwater | D Human health (10-6 risk for carcinogens) for consumption of: | ||||
Number compound | CAS No. | Criterion maximum conc.d ([MICRO]g/L) B1 | Criterion continuous conc.d ([MICRO]g/L) B2 | Criterion maximum conc.d ([MICRO]g/L) C1 | Criterion continuous conc.d ([MICRO]g/L) C2 | Water and organisms ([MICRO]g/L) D1 | Organisms only ([MICRO]g/L) D2 |
1. Antimony | 7440360 | a s 14 | a t 4300 | ||||
2. Arsenicb | 7440382 | i m w 340 | i m w 150 | i m 69 | i m 36 | ||
3. Beryllium | 7440417 | (n) | (n) | ||||
4. Cadmiumb | 7440439 | e i m w x 4.3 | e i m w 2.2 | i m 42 | i m 9.3 | (n) | (n) |
5a. Chromium (III) | 16065831 | e i m o 550 | e i m o 180 | (n) | (n) | ||
5b. Chromium (VI)b | 18540299 | i m w 16 | i m w 11 | i m 1100 | i m 50 | (n) | (n) |
6. Copperb | 7440508 | e i m w x 13 | e i m w 9.0 | i m 4.8 | i m 3.1 | 1300 | |
7. Leadb | 7439921 | e i m z 65 | e i m z 2.5 | i m 210 | i m 8.1 | (n) | (n) |
8. Mercuryb | 7439976 | [Reserved] | [Reserved] | [Reserved] | [Reserved] | a 0.050 | a 0.051 |
9. Nickelb | 7440020 | e i m w 470 | e i m w 52 | i m 74 | i m 8.2 | a 610 | a 4600 |
10. Seleniumb | 7782492 | p [Reserved] | q 5.0 | i m 290 | i m 71 | (n) | (n) |
11. Silverb | 7440224 | e i m 3.4 | i m 1.9 | ||||
12. Thallium | 7440280 | a s 1.7 | a t 6.3 | ||||
13. Zincb | 7440666 | e i m w x 120 | e i m w 120 | i m 90 | i m 81 | ||
14. Cyanideb | 57125 | o 22 | o 5.2 | rthnsp;1 | r 1 | a 700 | a j 220,000 |
15. Asbestos | 1332214 | k s 7,000,000 fibers/l | |||||
16. 2,3,7,8-TCDD (Dioxin) | 1746016 | c[GREATER THAN] 0.000000013 | c[GREATER THAN] 0.000000014 | ||||
17. Acrolein | 107028 | s[GREATER THAN] 320 | t[GREATER THAN] 780 | ||||
18. Acrylonitrile | 107131 | a c s 0.059 | a c t 0.66 | ||||
19. Benzene | 71432 | a c 1.2 | a c 71 | ||||
20. Bromoform | 75252 | a c 4.3 | a c 360 | ||||
21. Carbon Tetrachloride | 56235 | a c s 0.25 | a c t 4.4 | ||||
22. Chlorobenzene | 108907 | a s 680 | a j t 21,000 | ||||
23. Chlorodibromomethane | 124481 | a c y 0.41 | a c 34 | ||||
24. Chloroethane | 75003 | ||||||
25. 2-Chloroethylvinyl Ether | 110758 | ||||||
26. Chloroform | 67663 | [Reserved] | [Reserved] | ||||
27. Dichlorobromomethane | 75274 | a c y 0.56 | a c 46 | ||||
28. 1,1-Dichloroethane | 75343 | ||||||
29. 1,2-Dichloroethane | 107062 | a c s 0.38 | a c t 99 | ||||
30. 1,1-Dichloroethylene | 75354 | a c s 0.057 | a c t 3.2 | ||||
31. 1,2-Dichloropropane | 78875 | a 0.52 | a 39 | ||||
32. 1,3-Dichloropropylene | 542756 | a s 10 | a t 1,700 | ||||
33. Ethylbenzene | 100414 | a s 3,100 | a t 29,000 | ||||
34. Methyl Bromide | 74839 | a 48 | a 4,000 | ||||
35. Methyl Chloride | 74873 | (n) | (n) | ||||
36. Methylene Chloride | 75092 | a c 4.7 | a c 1,600 | ||||
37. 1,1,2,2-Tetrachloroethane | 79345 | a c s 0.17 | a c t 11 | ||||
38. Tetrachloroethylene | 127184 | c s 0.8 | c t 8.85 | ||||
39. Toluene | 108883 | a 6,800 | a 200,000 | ||||
40. 1,2-Trans-Dichloroethylene | 156605 | a 700 | a 140,000 | ||||
41. 1,1,1-Trichloroethane | 71556 | (n) | (n) | ||||
42. 1,1,2-Trichloroethane | 79005 | a c s 0.60 | a c t 42 | ||||
43. Trichloroethylene | 79016 | c s 2.7 | c t 81 | ||||
44. Vinyl Chloride | 75014 | c s 2 | c t 525 | ||||
45. 2-Chlorophenol | 95578 | a 120 | a 400 | ||||
46. 2,4-Dichlorophenol | 120832 | a s 93 | a t 790 | ||||
47. 2,4-Dimethylphenol | 105679 | a 540 | a 2,300 | ||||
48. 2-Methyl-4,6-Dinitrophenol | 534521 | s[GREATER THAN] 13.4 | t[GREATER THAN] 765 | ||||
49. 2,4-Dinitrophenol | 51285 | a s 70 | a t 14,000 | ||||
50. 2-Nitrophenol | 88755 | ||||||
51. 4-Nitrophenol | 100027 | ||||||
52. 3-Methyl-4-Chlorophenol | 59507 | ||||||
53. Pentachlorophenol | 87865 | f w 19 | f w 15 | 13 | 7.9 | a c 0.28 | a c j 8.2 |
54. Phenol | 108952 | a 21,000 | a j t 4,600,000 | ||||
55. 2,4,6-Trichlorophenol | 88062 | a c 2.1 | a c 6.5 | ||||
56. Acenaphthene | 83329 | a 1,200 | a 2,700 | ||||
57. Acenaphthylene | 208968 | ||||||
58. Anthracene | 120127 | a 9,600 | a 110,000 | ||||
59. Benzidine | 92875 | a c s 0.00012 | a c t 0.00054 | ||||
60. Benzo(a)Anthracene | 56553 | a c 0.0044 | a c 0.049 | ||||
61. Benzo(a)Pyrene | 50328 | a c 0.0044 | a c 0.049 | ||||
62. Benzo(b)Fluoranthene | 205992 | a c 0.0044 | a c 0.049 | ||||
63. Benzo(ghi)Perylene | 191242 | ||||||
64. Benzo(k)Fluoranthene | 207089 | a c 0.0044 | a c 0.049 | ||||
65. Bis(2-Chloroethoxy)Methane | 111911 | ||||||
66. Bis(2-Chloroethyl)Ether | 111444 | a c s 0.031 | a c t 1.4 | ||||
67. Bis(2-Chloroisopropyl)Ether | 108601 | a 1,400 | a t 170,000 | ||||
68. Bis(2-Ethylhexyl)Phthalate | 117817 | a c s 1.8 | a c t 5.9 | ||||
69. 4-Bromophenyl Phenyl Ether | 101553 | ||||||
70. Butylbenzyl Phthalate | 85687 | a 3,000 | a 5,200 | ||||
71. 2-Chloronaphthalene | 91587 | a 1,700 | a 4,300 | ||||
72. 4-Chlorophenyl Phenyl Ether | 7005723 | ||||||
73. Chrysene | 218019 | a c 0.0044 | a c 0.049 | ||||
74. Dibenzo(a,h)Anthracene | 53703 | a c 0.0044 | a c 0.049 | ||||
75. 1,2 Dichlorobenzene | 95501 | a 2,700 | a 17,000 | ||||
76. 1,3 Dichlorobenzene | 541731 | 400 | 2,600 | ||||
77. 1,4 Dichlorobenzene | 106467 | 400 | 2,600 | ||||
78. 3,3'-Dichlorobenzidine | 91941 | a c s 0.04 | a c t 0.077 | ||||
79. Diethyl Phthalate | 84662 | a s 23,000 | a t 120,000 | ||||
80. Dimethyl Phthalate | 131113 | s[GREATER THAN] 313,000 | t[GREATER THAN] 2,900,000 | ||||
81. Di-n-Butyl Phthalate | 84742 | a s 2,700 | a t 12,000 | ||||
82. 2,4-Dinitrotoluene | 121142 | c s 0.11 | c t 9.1 | ||||
83. 2,6-Dinitrotoluene | 606202 | ||||||
84. Di-n-Octyl Phthalate | 117840 | ||||||
85. 1,2-Diphenylhydrazine | 122667 | a c s 0.040 | a c t 0.54 | ||||
86. Fluoranthene | 206440 | a 300 | a 370 | ||||
87. Fluorene | 86737 | a 1,300 | a 14,000 | ||||
88. Hexachlorobenzene | 118741 | a c 0.00075 | a c 0.00077 | ||||
89. Hexachlorobutadiene | 87683 | a c s 0.44 | a c t 50 | ||||
90. Hexachlorocyclopentadiene | 77474 | a s 240 | a j t 17,000 | ||||
91. Hexachloroethane | 67721 | a c s 1.9 | a c t 8.9 | ||||
92. Indeno(1,2,3-cd) Pyrene | 193395 | a c 0.0044 | a c 0.049 | ||||
93. Isophorone | 78591 | c s 8.4 | c t 600 | ||||
94. Naphthalene | 91203 | ||||||
95. Nitrobenzene | 98953 | a s 17 | a j t 1,900 | ||||
96. N-Nitrosodimethylamine | 62759 | a c s 0.00069 | a c t 8.1 | ||||
97. N-Nitrosodi-n-Propylamine | 621647 | a 0.005 | a 1.4 | ||||
98. N-Nitrosodiphenylamine | 86306 | a c s 5.0 | a c t 16 | ||||
99. Phenanthrene | 85018 | ||||||
100. Pyrene | 129000 | a 960 | a 11,000 | ||||
101. 1,2,4-Trichlorobenzene | 120821 | ||||||
102. Aldrin | 309002 | g[GREATER THAN] 3 | g[GREATER THAN] 1.3 | a c 0.00013 | a c 0.00014 | ||
103. alpha-BHC | 319846 | a c 0.0039 | a c 0.013 | ||||
104. beta-BHC | 319857 | a c 0.014 | a c 0.046 | ||||
105. gamma-BHC | 58899 | w[GREATER THAN] 0.95 | g[GREATER THAN] 0.16 | c[GREATER THAN] 0.019 | c[GREATER THAN] 0.063 | ||
106. delta-BHC | 319868 | ||||||
107. Chlordane | 57749 | g[GREATER THAN] 2.4 | g[GREATER THAN] 0.0043 | g[GREATER THAN] 0.09 | g[GREATER THAN] 0.004 | a c 0.00057 | a c 0.00059 |
108. 4,4'-DDT | 50293 | g[GREATER THAN] 1.1 | g[GREATER THAN] 0.001 | g[GREATER THAN] 0.13 | g[GREATER THAN] 0.001 | a c 0.00059 | a c 0.00059 |
109. 4,4'-DDE | 72559 | a c 0.00059 | a c 0.00059 | ||||
110. 4,4'-DDD | 72548 | a c 0.00083 | a c 0.00084 | ||||
111. Dieldrin | 60571 | w[GREATER THAN] 0.24 | w[GREATER THAN] 0.056 | g[GREATER THAN] 0.71 | g[GREATER THAN] 0.0019 | a c 0.00014 | a c 0.00014 |
112. alpha-Endosulfan | 959988 | g[GREATER THAN] 0.22 | g[GREATER THAN] 0.056 | g[GREATER THAN] 0.034 | g[GREATER THAN] 0.0087 | a 110 | a 240 |
113. beta-Endosulfan | 33213659 | g[GREATER THAN] 0.22 | g[GREATER THAN] 0.056 | g[GREATER THAN] 0.034 | g[GREATER THAN] 0.0087 | a 110 | a 240 |
114. Endosulfan Sulfate | 1031078 | a 110 | a 240 | ||||
115. Endrin | 72208 | w[GREATER THAN] 0.086 | w[GREATER THAN] 0.036 | g[GREATER THAN] 0.037 | g[GREATER THAN] 0.0023 | a 0.76 | a j 0.81 |
116. Endrin Aldehyde | 7421934 | a 0.76 | a j 0.81 | ||||
117. Heptachlor | 76448 | g[GREATER THAN] 0.52 | g[GREATER THAN] 0.0038 | g[GREATER THAN] 0.053 | g[GREATER THAN] 0.0036 | a c 0.00021 | a c 0.00021 |
118. Heptachlor Epoxide | 1024573 | g[GREATER THAN] 0.52 | g[GREATER THAN] 0.0038 | g[GREATER THAN] 0.053 | g[GREATER THAN] 0.0036 | a c 0.00010 | a c 0.00011 |
119-125. Polychlorinated biphenyls (PCBs) | ur[GREATER THAN] 0.014 | ur[GREATER THAN] 0.03 | c v 0.00017 | c v 0.00017 | |||
126. Toxaphene | 8001352 | 0.73 | 0.0002 | 0.21 | 0.0002 | a c 0.00073 | a c 0.00075 |
Total Number of Criteriahr[GREATER THAN] | 22 | 21 | 22 | 20 | 92 | 90 |
Footnotes to Table in Paragraph (b)(1):
a Criteria revised to reflect the Agency q1* or RfD, as contained in the Integrated Risk Information System (IRIS) as of October 1, 1996. The fish tissue bioconcentration factor (BCF) from the 1980 documents was retained in each case.
b Criteria apply to California waters except for those waters subject to objectives in Tables III-2A and III-2B of the San Francisco Regional Water Quality Control Board's (SFRWQCB) 1986 Basin Plan that were adopted by the SFRWQCB and the State Water Resources Control Board, approved by the EPA, and which continue to apply. For copper and nickel, criteria apply to California waters except for waters south of Dumbarton Bridge in San Francisco Bay that are subject to the objectives in the SFRWQCB's Basin Plan as amended by SFRWQCB Resolution R2-2002-0061, dated May 22, 2002, and approved by the State Water Resources Control Board. The EPA approved the aquatic life site-specific objectives on January 21, 2003. The copper and nickel aquatic life site-specific objectives contained in the amended Basin Plan apply instead.
c Criteria are based on carcinogenicity of 10 (-6) risk.
d Criteria Maximum Concentration (CMC) equals the highest concentration of a pollutant to which aquatic life can be exposed for a short period of time without deleterious effects. Criteria Continuous Concentration (CCC) equals the highest concentration of a pollutant to which aquatic life can be exposed for an extended period of time (4 days) without deleterious effects. [MICRO]g/L equals micrograms per liter.
e Freshwater aquatic life criteria for metals are expressed as a function of total hardness (mg/L) in the water body. The equations are provided in matrix at paragraph (b)(2) of this section. Values displayed above in the matrix correspond to a total hardness of 100 mg/l.
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)-4.869). CCC = exp(1.005(pH)-5.134).
g This criterion is based on Clean Water Act (CWA) 304(a) aquatic life criterion issued in 1980, and was issued in one of the following documents: Aldrin/Dieldrin (EPA 440/5-80-019), Chlordane (EPA 440/5-80-027), DDT (EPA 440/5-80-038), Endosulfan (EPA 440/5-80-046), Endrin (EPA 440/5-80-047), Heptachlor (440/5-80-052), Hexachlorocyclohexane (EPA 440/5-80-054), Silver (EPA 440/5-80-071). The Minimum Data Requirements and derivation procedures were different in the 1980 Guidelines than in the 1985 Guidelines. For example, a "CMC" derived using the 1980 Guidelines was derived to be used as an instantaneous maximum. If assessment is to be done using an averaging period, the values given should be divided by 2 to obtain a value that is more comparable to a CMC derived using the 1985 Guidelines.
h These totals simply sum the criteria in each column. For aquatic life, there are 23 priority toxic pollutants with some type of freshwater or saltwater, acute or chronic criteria. For human health, there are 92 priority toxic pollutants with either "water + organism" or "organism only" criteria. Note that these totals count chromium as one pollutant even though the EPA has developed criteria based on two valence states. In the matrix, the EPA has assigned numbers 5a and 5b to the criteria for chromium to reflect the fact that the list of 126 priority pollutants includes only a single listing for chromium.
i Criteria for these metals are expressed as a function of the water-effect ratio, WER, as defined in paragraph (c) of this section. CMC = column B1 or C1 value * WER; CCC = column B2 or C2 value * WER.
j No criterion 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 CWA 304(a) criterion for asbestos is the MCL.
l [Reserved].
m These freshwater and saltwater criteria for metals are expressed in terms of the dissolved fraction of the metal in the water column. Criterion values were calculated by using the EPA's Clean Water Act 304(a) guidance values (described in the total recoverable fraction) and then applying the conversion factors in § 131.36(b)(1) and (2) .
n The EPA is not promulgating human health criteria for these contaminants. However, permit authorities should address these contaminants in NPDES permit actions using the State's existing narrative criteria for toxics.
o These criteria were promulgated for specific waters in California in the National Toxics Rule ("NTR"), at § 131.36 . The specific waters to which the NTR criteria apply include: Waters of the State defined as bays or estuaries and waters of the State defined as inland, i.e., all surface waters of the State not ocean waters. These waters specifically include the San Francisco Bay upstream to and including Suisun Bay and the Sacramento-San Joaquin Delta. This section does not apply instead of the NTR for this criterion.
p A criterion of 20 [MICRO]g/l was promulgated for specific waters in California in the NTR and was promulgated in the total recoverable form. The specific waters to which the NTR criterion applies include: Waters of the San Francisco Bay upstream to and including Suisun Bay and the Sacramento-San Joaquin Delta; and waters of Salt Slough, Mud Slough (north) and the San Joaquin River, Sack Dam to the mouth of the Merced River. This section does not apply instead of the NTR for this criterion. The State of California adopted and the EPA approved a site specific criterion for the San Joaquin River, mouth of Merced to Vernalis; therefore, this section does not apply to these waters.
q This criterion is expressed in the total recoverable form. This criterion was promulgated for specific waters in California in the NTR and was promulgated in the total recoverable form. The specific waters to which the NTR criterion applies include: Waters of the San Francisco Bay upstream to and including Suisun Bay and the Sacramento-San Joaquin Delta; and waters of Salt Slough, Mud Slough (north) and the San Joaquin River, Sack Dam to Vernalis. This criterion does not apply instead of the NTR for these waters. This criterion applies to additional waters of the United States in the State of California pursuant to paragraph (c) of this section. The State of California adopted and the EPA approved a site-specific criterion for the Grassland Water District, San Luis National Wildlife Refuge, and the Los Banos State Wildlife Refuge; therefore, this criterion does not apply to these waters.
r These criteria were promulgated for specific waters in California in the NTR. The specific waters to which the NTR criteria apply include: Waters of the State defined as bays or estuaries including the Sacramento-San Joaquin Delta within California Regional Water Board 5, but excluding the San Francisco Bay. This section does not apply instead of the NTR for these criteria.
s These criteria were promulgated for specific waters in California in the NTR. The specific waters to which the NTR criteria apply include: 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. This section does not apply instead of the NTR for these criteria.
t These criteria were promulgated for specific waters in California in the NTR. The specific waters to which the NTR criteria apply include: Waters of the State defined as bays and estuaries including San Francisco Bay upstream to and including Suisun Bay and 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) without a MUN use designation. This section does not apply instead of the NTR for these criteria.
u PCBs are a class of chemicals which include aroclors 1242, 1254, 1221, 1232, 1248, 1260, and 1016, CAS numbers 53469219, 11097691, 11104282, 11141165, 12672296, 11096825, and 12674112, respectively. The aquatic life criteria apply to the sum of this set of seven aroclors.
v This criterion applies to total PCBs, e.g., the sum of all congener or isomer or homolog or aroclor analyses.
w This criterion has been recalculated pursuant to the 1995 Updates: Water Quality Criteria Documents for the Protection of Aquatic Life in Ambient Water, Office of Water, EPA-820-B-96-001, September 1996. See also Great Lakes Water Quality Initiative Criteria Documents for the Protection of Aquatic Life in Ambient Water, Office of Water, EPA-80-B-95-004, March 1995.
x The State of California has adopted and the EPA has approved site specific criteria for the Sacramento River (and tributaries) above Hamilton City; therefore, these criteria do not apply to these waters.
y The State of California adopted and the EPA approved a site-specific criterion for New Alamo Creek from Old Alamo Creek to Ulatis Creek and for Ulatis Creek from Alamo Creek to Cache Slough; therefore, this criterion does not apply to these waters.
z The State of California adopted and the EPA approved a site-specific criterion for the Los Angeles River and its tributaries; therefore, this criterion does not apply to these waters.
General Notes To Table In Paragraph (b)(1)
Metal | mA | bA | mC | bC |
Cadmium | 1.128 | -3.6867 | 0.7852 | -2.715 |
Copper | 0.9422 | -1.700 | 0.8545 | -1.702 |
Chromium (III) | 0.8190 | 3.688 | 0.8190 | 1.561 |
Lead | 1.273 | -1.460 | 1.273 | -4.705 |
Nickel | 0.8460 | 2.255 | 0.8460 | 0.0584 |
Silver | 1.72 | -6.52 | ||
Zinc | 0.8473 | 0.884 | 0.8473 | 0.884 |
Note to Table 1: The term "exp" represents the base e exponential function.
Metal | Conversion factor (CF) for freshwater acute criteria | CF for freshwater chronic criteria | CF for saltwater acute criteria | CFa for saltwater chronic criteria |
Antimony | (d) | (d) | (d) | (d) |
Arsenic | 1.000 | 1.000 | 1.000 | 1.000 |
Beryllium | (d) | (d) | (d) | (d) |
Cadmium | b 0.944 | b 0.909 | 0.994 | 0.994 |
Chromium (III) | 0.316 | 0.860 | (d) | (d) |
Chromium (VI) | 0.982 | 0.962 | 0.993 | 0.993 |
Copper | 0.960 | 0.960 | 0.83 | 0.83 |
Lead | b 0.791 | b 0.791 | 0.951 | 0.951 |
Mercury | ||||
Nickel | 0.998 | 0.997 | 0.990 | 0.990 |
Selenium | (c) | 0.998 | 0.998 | |
Silver | 0.85 | (d) | 0.85 | (d) |
Thallium | (d) | (d) | (d) | (d) |
Zinc | 0.978 | 0.986 | 0.946 | 0.946 |
FOOTNOTES TO TABLE 2 OF PARAGRAPH( b)(2):
a Conversion Factors for chronic marine criteria are not currently available. Conversion Factors for acute marine criteria have been used for both acute and chronic marine criteria.
b Conversion Factors for these pollutants in freshwater are hardness dependent. CFs are based on a hardness of 100 mg/l as calcium carbonate (CaCO3). Other hardness can be used; CFs should be recalculated using the equations in table 3 to paragraph (b)(2) of this section.
c Bioaccumulative compound and inappropriate to adjust to percent dissolved.
d EPA has not published an aquatic life criterion value.
Note to table 2 of paragraph (b)(2): The term "Conversion Factor" represents the recommended conversion factor for converting a metal criterion expressed as the total recoverable fraction in the water column to a criterion expressed as the dissolved fraction in the water column. See "Office of Water Policy and Technical Guidance on Interpretation and Implementation of Aquatic Life Metals Criteria", October 1, 1993, by Martha G. Prothro, Acting Assistant Administrator for Water available from Water Resource Center, USEPA, Mailcode RC4100, M Street SW, Washington, DC 20460 and the note to § 131.36(b)(1) .
Acute | Chronic | |
Cadmium | CF = 1.136672-[(ln {hardness}) (0.041838)] | CF = 1.101672-[(ln {hardness})(0.041838)] |
Lead | CF = 1.46203-[(ln {hardness})(0.145712)] | CF = 1.46203-[(ln {hardness})(0.145712)] |
Criteria | Design flow |
Aquatic Life Acute Criteria (CMC) | 1 Q 10 or 1 B 3 |
Aquatic Life Chronic Criteria (CCC) | 7 Q 10 or 4 B 3 |
Human Health Criteria | Harmonic Mean Flow |
Note to table 4 of paragraph (c)(2):
Water and use classification | Applicable criteria |
(i) All inland waters of the United States or enclosed bays and estuaries that are waters of the United States that include a MUN use designation | (A) Columns B1 and B2-all pollutants (B) Columns C1 and C2-all pollutants (C) Column D1-all pollutants |
(ii) All inland waters of the United States or enclosed bays and estuaries that are waters of the United States that do not include a MUN use designation | (A) Columns B1 and B2-all pollutants (B) Columns C1 and C2-all pollutants (C) Column D2-all pollutants |
40 C.F.R. §131.38