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]