(a) [Reserved]
(b) MCLGs for the following contaminants are as indicated: ------------------------------------------------------------------------
Contaminant MCLG (mg/l)------------------------------------------------------------------------Antimony...................................... 0.006Arsenic....................................... zero \1\Asbestos...................................... 7 Million fibers/liter
(longer than 10
[micro]m).Barium........................................ 2Beryllium..................................... .004Cadmium....................................... 0.005Chromium...................................... 0.1Copper........................................ 1.3Cyanide (as free Cyanide)..................... .2Fluoride...................................... 4.0Lead.......................................... zeroMercury....................................... 0.002Nitrate....................................... 10 (as Nitrogen).Nitrite....................................... 1 (as Nitrogen).Total Nitrate+Nitrite......................... 10 (as Nitrogen).Selenium...................................... 0.05Thallium...................................... .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]