APPENDIX P 

List of 126 

CWA Section 307(a) 

Priority Toxic Pollutants 

WATER QUALITY STANDARDS HANDBOOK 

SECOND EDITION 
126 Priority Pollutants 

A. Chlorinated Benzenes 

Chlorobenzene 

1,2-dichlorobenzene 

1,3-dichlorobenzene 

1,4-dichlorobenzene 

1,2,4-trichlorobenzene 

Hexachlorobenzene 

B. Chlorinated Ethanes 

Chloroethane 

l,l-dichloroethane 

1,2-dichloroethane 

l,l,l-trichloroethane 

1,1,2-trichloroethane 

1,1,2,2-tetrachloroethane 

Hexachloroethane 

C. Chlorinated Phenols 

2-chlorophenol 

2,4-dichlorophenol 

2,4,6-trichlorophenol 

Parametachlorocresol (4-chloro-3-methyl phenol) 

D. Other Chlorinated Organics 

Chloroform (trichloromethane) 

Carbon tetrachloride (tetrachloromethane) 

Bis(2-chloroethoxy)methane 

Bis(2-chloroethyl)ether 

2-chloroethyl vinyl ether (mixed) 

2-chloronaphthalene 

3,3-dichlorobenzidine 

l,l-dichloroethylene 

1,2-trans-dichloroethylene 

1,2-dichloropropane 

1,2-dichloropropylene (1,3-dichloropropene) 

Tetrachloroethylene 

Trichloroethylene 

Vinyl chloride (chloroethylene) 

Hexachlorobutadiene 

Hexachlorocyclopentadiene 

2,3,7,8-tetrachloro-dibenzo-p-dioxin (TCDD) 

E. Haloethers 

4-chlorophenyl phenyl ether 

2-bromophenyl phenyl ether 

Bis(2-chloroisopropyl) ether 

F. Halomethanes 

Methylene chloride (dichloromethane) 

Methyl chloride (chloromethane) 

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Methyl Bromide (bromomethane) 

Bromoform (tribromomethane) 

Dichlorobromomethane 

Chlorodibromomethane 

G. Nitrosamines 

N-nitrosodimethylamine 

N-nitrosodiphenylamine 

N-nitrosodi-n-propylamine 

H. Phenols (other than chlorinated) 

2-nitrophenol 

4-nitrophenol 

2,4-dinitrophenol 

4.6-dinitro-o-cresol (4.6-dinitro-2-methylphenol) 

Pentachlorophenol 

Phenol 

2,4-dimethylphenol 

I. Phthalate Esters 

Bis(2-ethylhexyl)phthalate 

Butyl benzyl phthalate 

Di-N-butyl phthalate 

Di-n-octyl phthalate 

Diethyl phthalate 

Dimethyl phthalate 

J. Polnuclear Aromatic Hydrocarbons (PAHs) 

Acenaphthene 

1,2-benzanthracene (benzo(a) anthracene) 

Benzo(a)pyrene (3,4-benzo-pyrene) 

3,4-benzofluoranthene (benzo(b) fluoranthene) 

11.12-benzofluoranthene (benzo(k) fluoranthene) 

Chrysene 

Acenaphthalene 

Anthracene 

1,12-benzoperylene (bonze(ghi) perylene) 

Fluorene 

Fluoranthene 

Phenanthrene 

1,2,5,6-bibenzanthracene (dibenzo(ah) anthracene) 

Indeno (1,2,3-cd) pyrene (2,3-o-phenylene pyrene) 

Pyrene 

K. Pesticides and Metabolites 

Aldrin 

Dieldrin 

Chlordane (technical mixture and metobolites) 

Alpha-endosulfan 

Beta-endosulfan 

Endosulfan sulfate 

Endrin 

Endrin aldehyde 

Heptachlor 

Heptachlor epoxide (BHC-hexachlorocyclohexane) 

2 
Alpha-BHC 

Beta-BHC 

Gamma-BHC (Lindane) 

Delta-BHC 

Toxaphene 

L. DDT and Metabolites 

4,4-DDT 

4.4-DDE (p.p-DDX) 

4,4-DDD (p,p-TDE) 

M. Polychlorinated Biphenyls (PCBs) 

PCB-1242 (Arochlor 1242) 

PCB-1254 (Arochlor 1254) 

PCB-1221 (Arochlor 1221) 

PCB-1232 (Arochlor 1232) 

PCB-1248 (Arochlor 1248) 

PCB-1260 (Arochlor 1260) 

PCB-1016 (Arochlor 1016) 

N. Other Organics 

Acrolein 

Acrylonitrile 

Benzene 

Benzidine 

2,4-dinitrotoluene 

2,6-dinitrotoluene 

1,2-diphenylhydrazine 

Ethylbenzene 

Isophorone 

Naphthalene 

Nitrobenzene 

Toluene 

0. Inorganics 

Antimony 

Arsenic 

Asbestos 

Beryllium 

Cadmium 

Chromium 

Copper 

Cyanide, total 

Lead 

Mercury 

Nickel 

Selenium 

Silver 

Thallium 

Zinc 

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