['Water Programs']
['Water Quality', 'Safe Drinking Water', 'Maximum Contaminant Levels']
05/03/2022
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(a) [Reserved]
(b) MCLGs for the following contaminants are as indicated:
| 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.
Effective date notes: 1. At 56 FR 30266, July 1, 1991, §141.51(b)(3) was revised effective January 1, 1993.
2. At 56 FR 26460, June 7, 1991; 56 FR 32112, July 15, 1991, §141.51 was amended effective December 7, 1992.
[66 FR 7063 Jan. 22, 2001; 66 FR 28342 May 22, 2001]
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