PRIORITY TOXIC POLLUTANTS
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"The U.S. Environmental Protection Agency (EPA) identified Priority Pollutants in regulations that deal with municipal and
industrial wastewater (EPA, 1984) due to their toxicity to humans and the aquatic environment. These Priority Pollutants
are divided into four classes; (1) heavy metals (oftentimes referred to as trace elements or trace metals) and cyanide,
(2) volatile organic compounds, (3) semivolatile organic compounds, and (4) pesticides and polychlorinated biphenyls
(PCBs). In addition, nontoxic organic compounds in wastewater can be transformed into potential toxic chlorinated
compounds, such as trihalomethanes, when chlorine is used for disinfection purposes (National Research Council,
1980)." (National Research Council Study, Use of Reclaimed Water and Sludge in Food Crop Production. 1996)
§ 131.36 Toxics criteria for those states not complying with Clean Water Act section 303(c)(2)(B).
top
(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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A B Freshwater C Saltwater D Human Health (10-6 risk for
----------------------------------------------------------------------------------------------------------------------- carcinogens) For
consumption of:
Criterion Criterion ---------------------------------
Criterion Continuous Criterion Continuous Water &
(#) Compound CAS Number Maximum Conc. d Conc. d Maximum Conc. d Conc. d
Organisms Organisms Only
(µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L)
............... B1 B2 C1 C2 D1 D2
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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
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[prime]-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
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[prime]-DDT............... 50293 1.1 g 0.001 g 0.13 g 0.001 g 0.00059 ac
0.00059 ac
109 4,4[prime]-DDE............... 72559 ............... ............... ............... ............... 0.00059 ac 0.00059
ac
110 4,4[prime]-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 a
114 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 ............... ............... ............... ............... ............... 0.00017 q 0.00017
q
(PCBs)..........................
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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