{"data":{"id":"us/40-cfr-appendix-a-to-part-423","jurisdiction":"us","citation":"40 CFR Appendix A to Part 423","heading":"Appendix A to Part 423—126 Priority Pollutants","body":"001 Acenaphthene\n002 Acrolein\n003 Acrylonitrile\n004 Benzene\n005 Benzidine\n006 Carbon tetrachloride (tetrachloromethane)\n007 Chlorobenzene\n008 1,2,4-trichlorobenzene\n009 Hexachlorobenzene\n010 1,2-dichloroethane\n011 1,1,1-trichloreothane\n012 Hexachloroethane\n013 1,1-dichloroethane\n014 1,1,2-trichloroethane\n015 1,1,2,2-tetrachloroethane\n016 Chloroethane\n018 Bis(2-chloroethyl) ether\n019 2-chloroethyl vinyl ether (mixed)\n020 2-chloronaphthalene\n021 2,4, 6-trichlorophenol\n022 Parachlorometa cresol\n023 Chloroform (trichloromethane)\n024 2-chlorophenol\n025 1,2-dichlorobenzene\n026 1,3-dichlorobenzene\n027 1,4-dichlorobenzene\n028 3,3-dichlorobenzidine\n029 1,1-dichloroethylene\n030 1,2-trans-dichloroethylene\n031 2,4-dichlorophenol\n032 1,2-dichloropropane\n033 1,2-dichloropropylene (1,3-dichloropropene)\n034 2,4-dimethylphenol\n035 2,4-dinitrotoluene\n036 2,6-dinitrotoluene\n037 1,2-diphenylhydrazine\n038 Ethylbenzene\n039 Fluoranthene\n040 4-chlorophenyl phenyl ether\n041 4-bromophenyl phenyl ether\n042 Bis(2-chloroisopropyl) ether\n043 Bis(2-chloroethoxy) methane\n044 Methylene chloride (dichloromethane)\n045 Methyl chloride (dichloromethane)\n046 Methyl bromide (bromomethane)\n047 Bromoform (tribromomethane)\n048 Dichlorobromomethane\n051 Chlorodibromomethane\n052 Hexachlorobutadiene\n053 Hexachloromyclopentadiene\n054 Isophorone\n055 Naphthalene\n056 Nitrobenzene\n057 2-nitrophenol\n058 4-nitrophenol\n059 2,4-dinitrophenol\n060 4,6-dinitro-o-cresol\n061 N-nitrosodimethylamine\n062 N-nitrosodiphenylamine\n063 N-nitrosodi-n-propylamin\n064 Pentachlorophenol\n065 Phenol\n066 Bis(2-ethylhexyl) phthalate\n067 Butyl benzyl phthalate\n068 Di-N-Butyl Phthalate\n069 Di-n-octyl phthalate\n070 Diethyl Phthalate\n071 Dimethyl phthalate\n072 1,2-benzanthracene (benzo(a) anthracene\n073 Benzo(a)pyrene (3,4-benzo-pyrene)\n074 3,4-Benzofluoranthene (benzo(b) fluoranthene)\n075 11,12-benzofluoranthene (benzo(b) fluoranthene)\n076 Chrysene\n077 Acenaphthylene\n078 Anthracene\n079 1,12-benzoperylene (benzo(ghi) perylene)\n080 Fluorene\n081 Phenanthrene\n082 1,2,5,6-dibenzanthracene (dibenzo(,h) anthracene)\n083 Indeno (,1,2,3-cd) pyrene (2,3-o-pheynylene pyrene)\n084 Pyrene\n085 Tetrachloroethylene\n086 Toluene\n087 Trichloroethylene\n088 Vinyl chloride (chloroethylene)\n089 Aldrin\n090 Dieldrin\n091 Chlordane (technical mixture and metabolites)\n092 4,4-DDT\n093 4,4-DDE (p,p-DDX)\n094 4,4-DDD (p,p-TDE)\n095 Alpha-endosulfan\n096 Beta-endosulfan\n097 Endosulfan sulfate\n098 Endrin\n099 Endrin aldehyde\n100 Heptachlor\n101 Heptachlor epoxide (BHC-hexachlorocyclohexane)\n102 Alpha-BHC\n103 Beta-BHC\n104 Gamma-BHC (lindane)\n105 Delta-BHC (PCB-polychlorinated biphenyls)\n106 PCB-1242 (Arochlor 1242)\n107 PCB-1254 (Arochlor 1254)\n108 PCB-1221 (Arochlor 1221)\n109 PCB-1232 (Arochlor 1232)\n110 PCB-1248 (Arochlor 1248)\n111 PCB-1260 (Arochlor 1260)\n112 PCB-1016 (Arochlor 1016)\n113 Toxaphene\n114 Antimony\n115 Arsenic\n116 Asbestos\n117 Beryllium\n118 Cadmium\n119 Chromium\n120 Copper\n121 Cyanide, Total\n122 Lead\n123 Mercury\n124 Nickel\n125 Selenium\n126 Silver\n127 Thallium\n126 Silver\n128 Zinc\n129 2,3,7,8-tetrachloro-dibenzo-p-dioxin (TCDD)","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 423—STEAM ELECTRIC POWER GENERATING POINT SOURCE CATEGORY"],"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":"b2ed0c5640026f299ef9df9fd44ec799bd4039db5835177a2db3b3a0e0970f53","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-423.19","next":"us/40-cfr-424.10"},"notice":"GroundRules: Original legal text. Not legal advice."}