{"data":{"id":"us/40-cfr-appendix-ix-to-part-264","jurisdiction":"us","citation":"40 CFR Appendix IX to Part 264","heading":"Appendix IX to Part 264—Ground-Water Monitoring List","body":"Ground-Water Monitoring List\nCommon name 1 CAS RN 2 Chemical abstracts service index name 3\nAcenaphthene 83-32-9 Acenaphthylene, 1,2-dihydro-\nAcenaphthylene 208-96-8 Acenaphthylene\nAcetone 67-64-1 2-Propanone\nAcetophenone 98-86-2 Ethanone, 1-phenyl-\nAcetonitrile; Methyl cyanide 75-05-8 Acetonitrile\n2-Acetylaminofluorene; 2-AAF 53-96-3 Acetamide, N-9H-fluoren-2-yl-\nAcrolein 107-02-8 2-Propenal\nAcrylonitrile 107-13-1 2-Propenenitrile\nAldrin 309-00-2 1,4:5,8-Dimethanonaphthalene, 1,2,3,4,10,10-hexachloro-1,4,4a,5,8,8a-hexahydro-(1α,4α,4aβ,5α,8α,8aβ)-\nAllyl chloride 107-05-1 1-Propene, 3-chloro-\n4-Aminobiphenyl 92-67-1 [1,1′-Biphenyl]-4-amine\nAniline 62-53-3 Benzenamine\nAnthracene 120-12-7 Anthracene\nAntimony (Total) Antimony\nAramite 140-57-8 Sulfurous acid, 2-chloroethyl 2-[4-(1,1-dimethylethyl) phenoxy]-1-methylethyl ester\nArsenic (Total) Arsenic\nBarium (Total) Barium\nBenzene 71-43-2 Benzene\nBenzo[a]anthracene; Benzanthracene 56-55-3 Benz[a]anthracene\nBenzo[b]fluoranthene 205-99-2 Benz[e]acephenanthrylene\nBenzo[k]fluoranthene 207-08-9 Benzo[k]fluoranthene\nBenzo[ghi]perylene 191-24-2 Benzo[ghi]perylene\nBenzo[a]pyrene 50-32-8 Benzo[a]pyrene\nBenzyl alcohol 100-51-6 Benzenemethanol\nBeryllium (Total) Beryllium\nalpha-BHC 319-84-6 Cyclohexane, 1,2,3,4,5,6-hexachloro-,(1α,2α,3β,4β,5β,6β)-\nbeta-BHC 319-85-7 Cyclohexane, 1,2,3,4,5,6-hexachloro-,(1α,2β,3α,4β,5α,6β)-\ndelta-BHC 319-86-8 Cyclohexane, 1,2,3,4,5,6-hexachloro-,(1α,2α,3α,4β,5α,6β)-\ngamma-BHC; Lindane 58-89-9 Cyclohexane, 1,2,3,4,5,6-hexachloro-,(1α,2α,3β,4α,5α,6β)-\nBis(2-chloroethoxy)methane 111-91-1 Ethane, 1,1′-[methylenebis(oxy)]bis [2-chloro-\nBis(2-chloroethyl)ether 111-44-4 Ethane, 1,1′-oxybis[2-chloro-\nBis(2-chloro-1-methylethyl) ether; 2,2′-Dichlorodiisopropyl ether 108-60-1 Propane, 2,2′-oxybis[1-chloro-\nBis(2-ethylhexyl) phthalate 117-81-7 1,2-Benzenedicarboxylic acid, bis(2-ethylhexyl)ester\nBromodichloromethane 75-27-4 Methane, bromodichloro-\nBromoform; Tribromomethane 75-25-2 Methane, tribromo-\n4-Bromophenyl phenyl ether 101-55-3 Benzene, 1-bromo-4-phenoxy-\nButyl benzyl phthalate; Benzyl butyl phthalate 85-68-7 1,2-Benzenedicarboxylic acid, butyl phenylmethyl ester\nCadmium (Total) Cadmium\nCarbon disulfide 75-15-0 Carbon disulfide\nCarbon tetrachloride 56-23-5 Methane, tetrachloro-\nChlordane 57-74-9 4,7-Methano-1H-indene, 1,2,4,5,6,7,8,8-octachloro-2,3,3a,4,7,7a -hexahydro-\np-Chloroaniline 106-47-8 Benzenamine, 4-chloro-\nChlorobenzene 108-90-7 Benzene, chloro-\nChlorobenzilate 510-15-6 Benzeneacetic acid, 4-chloro-α-(4-chlorophenyl)-α-hydroxy-, ethyl ester\np-Chloro-m-cresol 59-50-7 Phenol, 4-chloro-3-methyl-\nChloroethane; Ethyl chloride 75-00-3 Ethane, chloro-\nChloroform 67-66-3 Methane, trichloro-\n2-Chloronaphthalene 91-58-7 Naphthalene, 2-chloro-\n2-Chlorophenol 95-57-8 Phenol, 2-chloro-\n4-Chlorophenyl phenyl ether 7005-72-3 Benzene, 1-chloro-4-phenoxy-\nChloroprene 126-99-8 1,3-Butadiene,2-chloro-\nChromium (Total) Chromium\nChrysene 218-01-9 Chrysene\nCobalt (Total) Cobalt\nCopper (Total) Copper\nm-Cresol 108-39-4 Phenol, 3-methyl-\no-Cresol 95-48-7 Phenol, 2-methyl-\np-Cresol 106-44-5 Phenol, 4-methyl-\nCyanide 57-12-5 Cyanide\n2,4-D; 2,4-Dichlorophenoxyacetic acid 94-75-7 Acetic acid, (2,4-dichlorophenoxy)-\n4,4′-DDD 72-54-8 Benzene 1,1′-(2,2-dichloroethylidene) bis[4-chloro-\n4,4′-DDE 72-55-9 Benzene, 1,1′-(dichloroethenylidene) bis[4-chloro-\n4,4′-DDT 50-29-3 Benzene, 1,1′-(2,2,2-trichloroethylidene) bis[4-chloro-\nDiallate 2303-16-4 Carbamothioic acid, bis(1-methylethyl)- , S- (2,3-dichloro-2-propenyl) ester\nDibenz[a,h]anthracene 53-70-3 Dibenz[a,h]anthracene\nDibenzofuran 132-64-9 Dibenzofuran\nDibromochloromethane; Chlorodibromomethane 124-48-1 Methane, dibromochloro-\n1,2-Dibromo-3-chloropropane; DBCP 96-12-8 Propane, 1,2-dibromo-3-chloro-\n1,2-Dibromoethane; Ethylene dibromide 106-93-4 Ethane, 1,2-dibromo-\nDi-n-butyl phthalate 84-74-2 1,2-Benzenedicarboxylic acid, dibutyl ester\no-Dichlorobenzene 95-50-1 Benzene, 1,2-dichloro-\nm-Dichlorobenzene 541-73-1 Benzene, 1,3-dichloro-\np-Dichlorobenzene 106-46-7 Benzene, 1,4-dichloro-\n3,3′-Dichlorobenzidine 91-94-1 [1,1′-Biphenyl]-4,4′-diamine, 3,3′-dichloro-\ntrans-1,4-Dichloro-2-butene 110-57-6 2-Butene, 1,4-dichloro-, (E)-\nDichlorodifluoromethane 75-71-8 Methane, dichlorodifluoro-\n1,1-Dichloroethane 75-34-3 Ethane, 1,1-dichloro-\n1,2-Dichloroethane; Ethylene dichloride 107-06-2 Ethane, 1,2-dichloro-\n1,1-Dichloroethylene; Vinylidene chloride 75-35-4 Ethene, 1,1-dichloro-\ntrans-1,2-Dichloroethylene 156-60-5 Ethene, 1,2-dichloro-, (E)-\n2,4-Dichlorophenol 120-83-2 Phenol, 2,4-dichloro-\n2,6-Dichlorophenol 87-65-0 Phenol, 2,6-dichloro-\n1,2-Dichloropropane 78-87-5 Propane, 1,2-dichloro-\ncis-1,3-Dichloropropene 10061-01-5 1-Propene, 1,3-dichloro-, (Z)-\ntrans-1,3-Dichloropropene 10061-02-6 1-Propene, 1,3-dichloro-, (E)-\nDieldrin 60-57-1 2,7:3,6-Dimethanonaphth [2,3-b]oxirene, 3,4,5,6,9,9-hexachloro-1a,2,2a,3,6,6a,7,7a-octahydro-, (1aα,2β,2aα,3β,6β;,6aα,7β,7aα)-\nDiethyl phthalate 84-66-2 1,2-Benzenedicarboxylic acid, diethyl ester\nO,O-Diethyl O-2-pyrazinyl phosphorothioate; Thionazin 297-97-2 Phosphorothioic acid, O,O-diethyl O-pyrazinyl ester\nDimethoate 60-51-5 Phosphorodithioic acid, O,O-dimethyl S-[2-(methylamino)-2-oxoethyl] ester\np-(Dimethylamino)azobenzene 60-11-7 Benzenamine, N,N-dimethyl-4-(phenylazo)-\n7,12-Dimethylbenz[a]anthracene 57-97-6 Benz[a]anthracene, 7,12-dimethyl-\n3,3′-Dimethylbenzidine 119-93-7 [1,1′-Biphenyl]-4,4′-diamine, 3,3′-dimethyl-\nalpha, alpha-Dimethylphenethylamine 122-09-8 Benzeneethanamine, α,α-dimethyl-\n2,4-Dimethylphenol 105-67-9 Phenol, 2,4-dimethyl-\nDimethyl phthalate 131-11-3 1,2-Benzenedicarboxylic acid, dimethyl ester\nm-Dinitrobenzene 99-65-0 Benzene, 1,3-dinitro-\n4,6-Dinitro-o-cresol 534-52-1 Phenol, 2-methyl-4,6-dinitro-\n2,4-Dinitrophenol 51-28-5 Phenol, 2,4-dinitro-\n2,4-Dinitrotoluene 121-14-2 Benzene, 1-methyl-2,4-dinitro-\n2,6-Dinitrotoluene 606-20-2 Benzene, 2-methyl-1,3-dinitro-\nDinoseb; DNBP; 2-sec-Butyl-4,6-dinitrophenol 88-85-7 Phenol, 2-(1-methylpropyl)-4,6-dinitro-\nDi-n-octyl phthalate 117-84-0 1,2-Benzenedicarboxylic acid, dioctyl ester\n1,4-Dioxane 123-91-1 1,4-Dioxane\nDiphenylamine 122-39-4 Benzenamine, N-phenyl-\nDisulfoton 298-04-4 Phosphorodithioic acid, O,O-diethyl S-[2-(ethylthio)ethyl]ester\nEndosulfan I 959-98-8 6,9-Methano-2,4,3- benzodioxathiepin, 6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-, 3-oxide,(3α,5aβ,6α,9α,9aβ)-\nEndosulfan II 33213-65-9 6,9-Methano-2,4,3- benzodioxathiepin, 6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-, 3-oxide, (3α,5aα,6β,9β,9aα)-\nEndosulfan sulfate 1031-07-8 6,9-Methano-2,4,3- benzodioxathiepin, 6,7,8,9,10,10-hexachloro-1,5,5a,6,9,9a-hexahydro-, 3,3-dioxide\nEndrin 72-20-8 2,7:3,6-Dimethanonaphth[2,3-b]oxirene, 3,4,5,6,9,9-hexachloro-,1a,2,2a,3,6,6a,7,7a-octahydro-, (1aα,2β,2aβ,3α,6α,6aβ,7β, 7aα)-\nEndrin aldehyde 7421-93-4 1,2,4- Methenocyclopenta[cd] pentalene-5-carboxaldehyde, 2,2a,3,3,4,7-hexachlorodecahydro-,(1α,2β,2aβ,4β,4aβ,5β,6aβ,6bβ,7R*)-\nEthylbenzene 100-41-4 Benzene, ethyl-\nEthyl methacrylate 97-63-2 2-Propenoic acid, 2-methyl-, ethyl ester\nEthyl methanesulfonate 62-50-0 Methanesulfonic acid, ethyl ester\nFamphur 52-85-7 Phosphorothioic acid, O-[4-[(dimethylamino)sulfonyl]phenyl]-O,O-dimethyl ester\nFluoranthene 206-44-0 Fluoranthene\nFluorene 86-73-7 9H-Fluorene\nHeptachlor 76-44-8 4,7-Methano-1H-indene, 1,4,5,6,7,8,8-heptachloro-3a,4,7,7a-tetrahydro-\nHeptachlor epoxide 1024-57-3 2,5-Methano-2H-indeno[1,2-b] oxirene, 2,3,4,5,6,7,7-heptachloro-1a,1b,5,5a,6,6a,-hexahydro-, (1aα,1bβ,2α,5α,5aβ,6β,6aα)\nHexachlorobenzene 118-74-1 Benzene, hexachloro-\nHexachlorobutadiene 87-68-3 1,3-Butadiene, 1,1,2,3,4,4-hexachloro-\nHexachlorocyclopentadiene 77-47-4 1,3-Cyclopentadiene, 1,2,3,4,5,5-hexachloro-\nHexachloroethane 67-72-1 Ethane, hexachloro-\nHexachlorophene 70-30-4 Phenol, 2,2′-methylenebis[3,4,6-trichloro-\nHexachloropropene 1888-71-7 1-Propene, 1,1,2,3,3,3-hexachloro-\n2-Hexanone 591-78-6 2-Hexanone\nIndeno(1,2,3-cd)pyrene 193-39-5 Indeno[1,2,3-cd]pyrene\nIsobutyl alcohol 78-83-1 1-Propanol, 2-methyl-\nIsodrin 465-73-6 1,4,5,8-Dimethanonaphthalene,1,2,3,4,1 0,10-hexachloro-1,4,4a,5,8,8a hexahydro-(1α, 4α, 4aβ, 5β, 8β, 8aβ)-\nIsophorone 78-59-1 2-Cyclohexen-1-one, 3,5,5-trimethyl-\nIsosafrole 120-58-1 1,3-Benzodioxole, 5-(1-propenyl)-\nKepone 143-50-0 1,3,4-Metheno-2H-cyclobuta-[cd]pentalen-2-one, 1,1a,3,3a,4,5,5,5a,5b,6-decachlorooctahydro-\nLead (Total) Lead\nMercury (Total) Mercury\nMethacrylonitrile 126-98-7 2-Propenenitrile, 2-methyl-\nMethapyrilene 91-80-5 1,2,Ethanediamine,N,N-dimethyl-N′-2-pyridinyl-N′-(2-thienylmethyl)-\nMethoxychlor 72-43-5 Benzene, 1,1′-(2,2,2,trichloroethylidene)bis [4-methoxy-\nMethyl bromide; Bromomethane 74-83-9 Methane, bromo-\nMethyl chloride; Chloromethane 74-87-3 Methane, chloro-\n3-Methylcholanthrene 56-49-5 Benz[j]aceanthrylene, 1,2-dihydro-3-methyl-\nMethylene bromide; Dibromomethane 74-95-3 Methane, dibromo-\nMethylene chloride; Dichloromethane 75-09-2 Methane, dichloro-\nMethyl ethyl ketone; MEK; 78-93-3 2-Butanone\nMethyl iodide; Iodomethane 74-88-4 Methane, iodo-\nMethyl methacrylate 80-62-6 2-Propenoic acid, 2-methyl-, methyl ester\nMethyl methanesulfonate 66-27-3 Methanesulfonic acid, methyl ester\n2-Methylnaphthalene 91-57-6 Naphthalene, 2-methyl-\nMethyl parathion; Parathion methyl 298-00-0 Phosphorothioic acid, O,O-dimethyl O-(4-nitrophenyl) ester\n4-Methyl-2-pentanone; Methyl isobutyl ketone 108-10-1 2-Pentanone, 4-methyl-\nNaphthalene 91-20-3 Naphthalene\n1,4-Naphthoquinone 130-15-4 1,4-Naphthalenedione\n1-Naphthylamine 134-32-7 1-Naphthalenamine\n2-Naphthylamine 91-59-8 2-Naphthalenamine\nNickel (Total) Nickel\no-Nitroaniline 88-74-4 Benzenamine, 2-nitro-\nm-Nitroaniline 99-09-2 Benzenamine, 3-nitro-\np-Nitroaniline 100-01-6 Benzenamine, 4-nitro-\nNitrobenzene 98-95-3 Benzene, nitro-\no-Nitrophenol 88-75-5 Phenol, 2-nitro-\np-Nitrophenol 100-02-7 Phenol, 4-nitro-\n4-Nitroquinoline 1-oxide 56-57-5 Quinoline, 4-nitro, 1-oxide\nN-Nitrosodi-n-butylamine 924-16-3 1-Butanamine, N-butyl-N-nitroso-\nN-Nitrosodiethylamine 55-18-5 Ethanamine, N-ethyl-N-nitroso-\nN-Nitrosodimethylamine 62-75-9 Methanamine, N-methyl-N-nitroso-\nN-Nitrosodiphenylamine 86-30-6 Benzenamine, N-nitroso-N-phenyl-\nN-Nitrosodipropylamine;Di-n-propylnitrosamine 621-64-7 1-Propanamine, N-nitroso-N-propyl-\nN-Nitrosomethylethalamine 10595-95-6 Ethanamine, N-methyl-N-nitroso-\nN-Nitrosomorpholine 59-89-2 Morpholine, 4-nitroso-\nN-Nitrosopiperidine 100-75-4 Piperidine, 1-nitroso-\nN-Nitrosopyrrolidine 930-55-2 Pyrrolidine, 1-nitroso-\n5-Nitro-o-toluidine 99-55-8 Benzenamine, 2-methyl-5-nitro-\nParathion 56-38-2 Phosphorothioic acid, O,O-diethyl-O-(4-nitrophenyl) ester\nPolychlorinated biphenyls; PCBs See footnote 4 1,1′-Biphenyl, chloro derivatives\nPolychlorinated dibenzo-p-dioxins; PCDDs See footnote 5 Dibenzo[b,e][1,4]dioxin, chloro derivatives\nPolychlorinated dibenzofurans; PCDFs See footnote 6 Dibenzofuran, chloro derivatives\nPentachlorobenzene 608-93-5 Benzene, pentachloro-\nPentachloroethane 76-01-7 Ethane, pentachloro-\nPentachloronitrobenzene 82-68-8 Benzene, pentachloronitro-\nPentachlorophenol 87-86-5 Phenol, pentachloro-\nPhenacetin 62-44-2 Acetamide, N-(4-ethoxyphenyl)\nPhenanthrene 85-01-8 Phenanthrene\nPhenol 108-95-2 Phenol\np-Phenylenediamine 106-50-3 1,4-Benzenediamine\nPhorate 298-02-2 Phosphorodithioic acid, O,O-diethyl S- [(ethylthio)methyl] ester\n2-Picoline 109-06-8 Pyridine, 2-methyl-\nPronamide 23950-58-5 Benzamide, 3,5-dichloro-N-(1,1-dimethyl-2-propynyl)-\nPropionitrile; Ethyl cyanide 107-12-0 Propanenitrile\nPyrene 129-00-0 Pyrene\nPyridine 110-86-1 Pyridine\nSafrole 94-59-7 1,3-Benzodioxole, 5-(2-propenyl)-\nSelenium (Total) Selenium\nSilver (Total) Silver\nSilvex; 2,4,5-TP 93-72-1 Propanoic acid, 2-(2,4,5- trichlorophenoxy)-\nStyrene 100-42-5 Benzene, ethenyl-\nSulfide 18496-25-8 Sulfide\n2,4,5-T; 2,4,5-Trichlorophenoxyacetic acid 93-76-5 Acetic acid, (2,4,5-trichlorophenoxy)-\n2,3,7,8-TCDD; 2,3,7,8-Tetrachlorodibenzo-p-dioxin 1746-01-6 Dibenzo[b,e][1,4]dioxin, 2,3,7,8-tetrachloro-\n1,2,4,5-Tetrachlorobenzene 95-94-3 Benzene, 1,2,4,5-tetrachloro-\n1,1,1,2-Tetrachloroethane 630-20-6 Ethane, 1,1,1,2-tetrachloro-\n1,1,2,2-Tetrachloroethane 79-34-5 Ethane, 1,1,2,2-tetrachloro-\nTetrachloroethylene; Perchloroethylene; Tetrachloroethene 127-18-4 Ethene, tetrachloro-\n2,3,4,6-Tetrachlorophenol 58-90-2 Phenol, 2,3,4,6-tetrachloro-\nTetraethyl dithiopyrophosphate; Sulfotepp 3689-24-5 Thiodiphosphoric acid ([(HO)2 P(S)]2 O), tetraethyl ester\nThallium (Total) Thallium\nTin (Total) Tin\nToluene 108-88-3 Benzene, methyl-\no-Toluidine 95-53-4 Benzenamine, 2-methyl-\nToxaphene 8001-35-2 Toxaphene\n1,2,4-Trichlorobenzene 120-82-1 Benzene, 1,2,4-trichloro-\n1,1,1-Trichloroethane; Methylchloroform 71-55-6 Ethane, 1,1,1-trichloro-\n1,1,2-Trichloroethane 79-00-5 Ethane, 1,1,2-trichloro-\nTrichloroethylene; Trichloroethene 79-01-6 Ethene, trichloro-\nTrichlorofluoromethane 75-69-4 Methane, trichlorofluoro-\n2,4,5-Trichlorophenol 95-95-4 Phenol, 2,4,5-trichloro-\n2,4,6-Trichlorophenol 88-06-2 Phenol, 2,4,6-trichloro-\n1,2,3-Trichloropropane 96-18-4 Propane, 1,2,3-trichloro-\nO,O,O-Triethyl phosphorothioate 126-68-1 Phosphorothioic acid, O,O,O-triethyl ester\nsym-Trinitrobenzene 99-35-4 Benzene, 1,3,5-trinitro-\nVanadium (Total) Vanadium\nVinyl acetate 108-05-4 Acetic acid, ethenyl ester\nVinyl chloride 75-01-4 Ethene, chloro-\nXylene (total) 1330-20-7 Benzene, dimethyl-\nZinc (Total) Zinc\n1 Common names are those widely used in government regulations, scientific publications, and commerce; synonyms exist for many chemicals.\n2 Chemical Abstracts Service registry number. Where “Total” is entered, all species in the ground water that contain this element are included.\n3 CAS index names are those used in the 9th Cumulative Index.\n4 Polychlorinated biphenyls (CAS RN 1336-36-3); this category contains congener chemicals, including constituents of Aroclor-1016 (CAS RN 12674-11-2), Aroclor-1221 (CAS RN 11104-28-2), Aroclor-1232 (CAS RN 11141-16-5), Aroclor-1242 (CAS RN 53469-21-9), Aroclor-1248 (CAS RN 12672-29-6), Aroclor-1254 (CAS RN 11097-69-1), and Aroclor-1260 (CAS RN 11096-82-5).\n5 This category contains congener chemicals, including tetrachlorodibenzo-p-dioxins (see also 2,3,7,8-TCDD), pentachlorodibenzo-p-dioxins, and hexachlorodibenzo-p-dioxins.\n6 This category contains congener chemicals, including tetrachlorodibenzofurans, pentachlorodibenzofurans, and hexachlorodibenzofurans.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER I—SOLID WASTES","PART 264—STANDARDS FOR OWNERS AND OPERATORS OF HAZARDOUS WASTE TREATMENT, STORAGE, AND DISPOSAL FACILITIES"],"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":"fef99b1c792cd8c9e22e99f68870860aa2e7badb88ae6b52500f6f1b5b1e0402","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-appendixes-vii-viii-to-part-264","next":"us/40-cfr-265.1"},"notice":"GroundRules: Original legal text. Not legal advice."}