Priority Pollutant List
Priority Pollutants are a set of chemical pollutants we regulate, and for which we have
developed analytical test methods. The current list of 126 Priority Pollutants, shown below, can also be found at 40 CFR Part 423, Appendix A.
These are not the only pollutants regulated in Clean Water Act programs. The list is an important starting point for EPA to consider, for example, in developing national discharge standards (such as Effluent Guidelines) or in national permitting programs (such as NPDES).
1. Acenaphthene 35. 2,4-dinitrotoluene 2. Acrolein 36. 2,6-dinitrotoluene 3. Acrylonitrile 37. 1,2-diphenylhydrazine 4. Benzene 38. Ethylbenzene 5. Benzidine 39. Fluoranthene 6. Carbon tetrachloride 40. 4-chlorophenyl phenyl ether 7. Chlorobenzene 41. 4-bromophenyl phenyl ether 8. 1,2,4-trichlorobenzene 42. Bis(2-chloroisopropyl) ether 9. Hexachlorobenzene 43. Bis(2-chloroethoxy) methane 10. 1,2-dichloroethane 44. Methylene chloride 11. 1,1,1-trichloreothane 45. Methyl chloride 12. Hexachloroethane 46. Methyl bromide 13. 1,1-dichloroethane 47. Bromoform 14. 1,1,2-trichloroethane 48. Dichlorobromomethane 15. 1,1,2,2-tetrachloroethane 49. (Removed) 16. Chloroethane 50. (Removed) 17. (Removed) 51. Chlorodibromomethane 18. Bis(2-chloroethyl) ether 52. Hexachlorobutadiene 19. 2-chloroethyl vinyl ethers 53. Hexachlorocyclopentadiene 20. 2-chloronaphthalene 54. Isophorone 21. 2,4,6-trichlorophenol 55. Naphthalene 22. Parachlorometa cresol 56. Nitrobenzene 23. Chloroform 57. 2-nitrophenol 24. 2-chlorophenol 58. 4-nitrophenol 25. 1,2-dichlorobenzene 59. 2,4-dinitrophenol 26. 1,3-dichlorobenzene 60. 4,6-dinitro-o-cresol 27. 1,4-dichlorobenzene 61. N-nitrosodimethylamine 28. 3,3-dichlorobenzidine 62. N-nitrosodiphenylamine 29. 1,1-dichloroethylene 63. N-nitrosodi-n-propylamine 30. 1,2-trans-dichloroethylene 64. Pentachlorophenol 31. 2,4-dichlorophenol 65. Phenol 32. 1,2-dichloropropane 66. Bis(2-ethylhexyl) phthalate 33. 1,3-dichloropropylene 67. Butyl benzyl phthalate 34. 2,4-dimethylphenol 68. Di-N-Butyl Phthalate
69. Di-n-octyl phthalate 70. Diethyl Phthalate 71. Dimethyl phthalate 72. Benzo(a) anthracene 73. Benzo(a) pyrene
74. Benzo(b) fluoranthene 75. Benzo(k) fluoranthene 76. Chrysene
77. Acenaphthylene 78. Anthracene
79. Benzo(ghi) perylene 80. Fluorene 81. Phenanthrene
82. Dibenzo(,h) anthracene 83. Indeno (1,2,3-cd) pyrene 84. Pyrene
85. Tetrachloroethylene 86. Toluene
87. Trichloroethylene 88. Vinyl chloride 89. Aldrin 90. Dieldrin 91. Chlordane 92. 4,4-DDT 93. 4,4-DDE 94. 4,4-DDD
95. Alpha-endosulfan 96. Beta-endosulfan 97. Endosulfan sulfate 98. Endrin
99. Endrin aldehyde
Additional Information
December 2014
100. Heptachlor
101. Heptachlor epoxide 102. Alpha-BHC 103. Beta-BHC 104. Gamma-BHC 105. Delta-BHC
106. PCB-1242 (Arochlor 1242) 107. PCB-1254 (Arochlor 1254) 108. PCB-1221 (Arochlor 1221) 109. PCB-1232 (Arochlor 1232) 110. PCB-1248 (Arochlor 1248) 111. PCB-1260 (Arochlor 1260) 112. PCB-1016 (Arochlor 1016) 113. Toxaphene 114. Antimony 115. Arsenic 116. Asbestos 117. Beryllium 118. Cadmium 119. Chromium 120. Copper
121. Cyanide, Total 122. Lead 123. Mercury 124. Nickel 125. Selenium 126. Silver 127. Thallium 128. Zinc
129. 2,3,7,8-TCDD
Toxic and Priority Pollutants Under the Clean Water Act
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