40 Protection of Environment 21 2004-07-01 2004-07-01 false Maximum contaminant level goals for inorganic contaminants. 141.51 Section 141.51 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) WATER PROGRAMS (CONTINUED) NATIONAL PRIMARY DRINKING WATER REGULATIONS Maximum Contaminant Level Goals and Maximum Residual Disinfectant Level Goals
§ 141.51 Maximum contaminant level goals for inorganic contaminants.

(a) [Reserved]

(b) MCLGs for the following contaminants are as indicated:

Contaminant MCLG (mg/l) Antimony 0.006 Arsenic zero 1 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 1 This 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]