§ 141.51. Maximum contaminant level goals for inorganic contaminants.

Code of Federal Regulations

Title 40. Protection of Environment

Chapter I. ENVIRONMENTAL PROTECTION AGENCY

Subchapter D. WATER PROGRAMS

Part 141. NATIONAL PRIMARY DRINKING WATER REGULATIONS

Subpart F. MAXIMUM CONTAMINANT LEVEL GOALS AND MAXIMUM RESIDUAL DISINFECTANT LEVEL GOALS

Current through July 3, 2019

§ 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 [MICRO]m).
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.

Cite as 40 C.F.R. § 141.51

History. 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