40 CFR § 141.51
Maximum contaminant level goals for inorganic contaminants
June 9, 2020
(a) [Reserved]
(b) MCLGs for the following contaminants are as indicated:
Open Table
| Contaminant | MCLG (mg/l) |
|---|---|
| Antimony | 0.006 |
| Arsenic | zero1 |
| Asbestos | 7 Million fibers/liter (longer than 10 µm). |
| Barium | 2 |
| Beryllium | .004 |
| Cadmium | 0.005 |
| Chromium | 0.1 |
| Copper | 1.3 |
| Cyanide (as free Cyanide) | .2 |
| Fluoride | 4.0 |
| Lead | zero |
| Mercury | 0.002 |
| Nitrate | 10 (as Nitrogen). |
| Nitrite | 1 (as Nitrogen). |
| Total Nitrate + Nitrite | 10 (as Nitrogen). |
| Selenium | 0.05 |
| Thallium | .0005 |
1This value for arsenic is effective January 23, 2006. Until then, there is no MCLG.
[50 FR 47155, Nov. 14, 1985, as amended at 52 FR 20674, June 2, 1987; 56 FR 3593, Jan. 30, 1991; 56 FR 26548, June 7, 1991; 56 FR 30280, July 1, 1991; 57 FR 31846, July 17, 1992; 60 FR 33932, June 29, 1995; 66 FR 7063, Jan. 22, 2001]
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