Regulations last checked for updates: Jan 30, 2025

Title 40 - Protection of Environment last revised: Nov 08, 2025
All TitlesTitle 40Chapter IPart 258Subpart GAppendix Appendix I - Appendix I to Part 258—Constituents for Detection Monitoring
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Appendix Appendix I - Appendix I to Part 258—Constituents for Detection Monitoring
Common name 1 CAS RN 2
Inorganic Constituents:
(1) Antimony(Total)
(2) Arsenic(Total)
(3) Barium(Total)
(4) Beryllium(Total)
(5) Cadmium(Total)
(6) Chromium(Total)
(7) Cobalt(Total)
(8) Copper(Total)
(9) Lead(Total)
(10) Nickel(Total)
(11) Selenium(Total)
(12) Silver(Total)
(13) Thallium(Total)
(14) Vanadium(Total)
(15) Zinc(Total)
Organic Constituents:
(16) Acetone67-64-1
(17) Acrylonitrile107-13-1
(18) Benzene71-43-2
(19) Bromochloromethane74-97-5
(20) Bromodichloromethane75-27-4
(21) Bromoform; Tribromomethane75-25-2
(22) Carbon disulfide75-15-0
(23) Carbon tetrachloride56-23-5
(24) Chlorobenzene108-90-7
(25) Chloroethane; Ethyl chloride75-00-3
(26) Chloroform; Trichloromethane67-66-3
(27) Dibromochloromethane; Chlorodibromomethane124-48-1
(28) 1,2-Dibromo-3-chloropropane; DBCP96-12-8
(29) 1,2-Dibromoethane; Ethylene dibromide; EDB106-93-4
(30) o-Dichlorobenzene; 1,2-Dichlorobenzene95-50-1
(31) p-Dichlorobenzene; 1,4-Dichlorobenzene106-46-7
(32) trans-1, 4-Dichloro-2-butene110-57-6
(33) 1,1-Dichlorethane; Ethylidene chloride75-34-3
(34) 1,2-Dichlorethane; Ethylene dichloride107-06-2
(35) 1,1-Dichloroethylene; 1,1-Dichloroethene; Vinylidene chloride75-35-4
(36) cis-1,2-Dichloroethylene; cis-1,2-Dichloroethene156-59-2
(37) trans-1, 2-Dichloroethylene; trans-1,2-Dichloroethene156-60-5
(38) 1,2-Dichloropropane; Propylene dichloride78-87-5
(39) cis-1,3-Dichloropropene10061-01-5
(40) trans-1,3-Dichloropropene10061-02-6
(41) Ethylbenzene100-41-4
(42) 2-Hexanone; Methyl butyl ketone591-78-6
(43) Methyl bromide; Bromomethane74-83-9
(44) Methyl chloride; Chloromethane74-87-3
(45) Methylene bromide; Dibromomethane74-95-3
(46) Methylene chloride; Dichloromethane75-09-2
(47) Methyl ethyl ketone; MEK; 2-Butanone78-93-3
(48) Methyl iodide; Idomethane74-88-4
(49) 4-Methyl-2-pentanone; Methyl isobutyl ketone108-10-1
(50) Styrene100-42-5
(51) 1,1,1,2-Tetrachloroethane630-20-6
(52) 1,1,2,2-Tetrachloroethane79-34-5
(53) Tetrachloroethylene; Tetrachloroethene; Perchloroethylene127-18-4
(54) Toluene108-88-3
(55) 1,1,1-Trichloroethane; Methylchloroform71-55-6
(56) 1,1,2-Trichloroethane79-00-5
(57) Trichloroethylene; Trichloroethene79-01-6
(58) Trichlorofluoromethane; CFC-1175-69-4
(59) 1,2,3-Trichloropropane96-18-4
(60) Vinyl acetate108-05-4
(61) Vinyl chloride75-01-4
(62) Xylenes1330-20-7

1 Common names are those widely used in government regulations, scientific publications, and commerce; synonyms exist for many chemicals.

2 Chemical Abstract Service registry number. Where “Total” is entered, all species in the ground water that contain this element are included.

[70 FR 34555, June 14, 2005; 70 FR 44150, Aug. 1, 2005]
authority: 33 U.S.C. 1345(d) and (e); 42 U.S.C. 6902(a), 6907, 6912(a), 6944, 6945(c) and 6949a(c), 6981(a)
source: 56 FR 51016, Oct. 9, 1991, unless otherwise noted.
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