40 CFR Table 1 to Subpart A of Part 192
Maximum Concentration of Constituents for Groundwater Protection
June 9, 2020
Open Table
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 (C10 H10 Cl6, 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 |
1Milligrams per liter, unless stated otherwise.
2Where 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.
[60 FR 2866, Jan. 11, 1995]