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Priority Pollutants

Background on this 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 in Appendix A to 40 CFR Part 423.

  1. Acenaphthene
  2. Acrolein
  3. Acrylonitrile
  4. Benzene
  5. Benzidine
  6. Carbon tetrachloride
  7. Chlorobenzene
  8. 1,2,4-trichlorobenzene
  9. Hexachlorobenzene
  10. 1,2-dichloroethane
  11. 1,1,1-trichloreothane
  12. Hexachloroethane
  13. 1,1-dichloroethane
  14. 1,1,2-trichloroethane
  15. 1,1,2,2-tetrachloroethane
  16. Chloroethane
  17. REMOVED
  18. Bis(2-chloroethyl) ether
  19. 2-chloroethyl vinyl ethers
  20. 2-chloronaphthalene
  21. 2,4,6-trichlorophenol
  22. Parachlorometa cresol
  23. Chloroform
  24. 2-chlorophenol
  25. 1,2-dichlorobenzene
  26. 1,3-dichlorobenzene
  27. 1,4-dichlorobenzene
  28. 3,3-dichlorobenzidine
  29. 1,1-dichloroethylene
  30. 1,2-trans-dichloroethylene
  31. 2,4-dichlorophenol
  32. 1,2-dichloropropane
  33. 1,2-dichloropropylene
  34. 2,4-dimethylphenol
  35. 2,4-dinitrotoluene
  36. 2,6-dinitrotoluene
  37. 1,2-diphenylhydrazine
  38. Ethylbenzene
  39. Fluoranthene
  40. 4-chlorophenyl phenyl ether
  41. 4-bromophenyl phenyl ether
  42. Bis(2-chloroisopropyl) ether
  43. Bis(2-chloroethoxy) methane
  44. Methylene chloride
  45. Methyl chloride
  46. Methyl bromide
  47. Bromoform
  48. Dichlorobromomethane
  49. REMOVED
  50. REMOVED
  51. Chlorodibromomethane
  52. Hexachlorobutadiene
  53. Hexachlorocyclopentadiene
  54. Isophorone
  55. Naphthalene
  56. Nitrobenzene
  57. 2-nitrophenol
  58. 4-nitrophenol
  59. 2,4-dinitrophenol
  60. 4,6-dinitro-o-cresol
  61. N-nitrosodimethylamine
  62. N-nitrosodiphenylamine
  63. N-nitrosodi-n-propylamine
  64. Pentachlorophenol
  65. Phenol
  66. Bis(2-ethylhexyl) phthalate
  67. Butyl benzyl phthalate
  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(b) 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
  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

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