Maximum contaminant level goals for inorganic contaminants.

  1. Law
  2. CFR 40
  3. Protection of Environment
  4. Environmental Protection Agency
  5. Water Programs
  6. National Primary Drinking Water Regulations
  7. Maximum Contaminant Level Goals and Maximum Residual Disinfectant Level Goals
  8. Maximum contaminant level goals for inorganic contaminants.

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§ 141.51 Maximum contaminant level goals for inorganic contaminants.

(a) [Reserved]

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

Expand Table
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

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]


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