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Code of Federal Regulations Title 40. Protection of Environment 40 CFR Pt. 192, Subpt. A, Tbl. 1 Table 1 to Subpart A

Current as of January 02, 2025 | Updated by Findlaw Staff

Maximum Concentration of Constituents for Groundwater Protection

Constituent concentration1

Maximum

Arsenic

0.05

Barium

1.0

Cadmium

0.01

Chromium

0.05

Lead

0.05

Mercury

0.002

Selenium

0.01

Silver

0.05

Nitrate (as N)

10.

Molybdenum

0.1

Combined radium-226 and radium-228

5 pCi/liter

Combined uranium-234 and uranium-2382

30 pCi/liter

Gross alpha-particle activity (excluding radon and uranium)

15 pCi/liter

Endrin (1,2,3,4,10,10-hexachloro- 6,7-exposy-1,4,4a,5,6,7,8,8a- octahydro- 1,4-endo,endo-5,8- dimethanonaphthalene)

0.0002

Lindane (1,2,3,4,5,6-hexachlorocyclohexane, gamma insomer)

0.004

Methoxychlor (1,1,1-trichloro-2,2'- bis(p-methoxyphenylethane))

0.1

Toxaphene (C10H10Cl6, technical chlorinated camphene, 67–69 percent chlorine)

0.005

2,4-D (2,4-dichlorophenoxyacetic acid)

0.1

2,4,5-TP Silvex (2,4,5-trichlorophenoxypropionic acid)

0.01

1 Milligrams per liter, unless stated otherwise.

2 Where secular equilibrium obtains, this criterion will be satisfied by a concentration of 0.044 milligrams per liter (0.044 mg/l). For conditions of other than secular equilibrium, a corresponding value may be derived and applied, based on the measured site-specific ratio of the two isotopes of uranium.

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Cite this article: FindLaw.com - Code of Federal Regulations Title 40. Protection of Environment 40 CFR Pt. 192, Subpt. A, Tbl. 1 Table 1 to Subpart A - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-40-protection-of-environment/cfr-pt-40-192-subpt-a-tbl-1/

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