40 CFR 141.51 - Maximum contaminant level goals for inorganic contaminants.

Beta! The text on the eCFR tab represents the unofficial eCFR text at ecfr.gov.
§ 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]

This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.

This list is taken from the Parallel Table of Authorities and Rules provided by GPO [Government Printing Office].

It is not guaranteed to be accurate or up-to-date, though we do refresh the database weekly. More limitations on accuracy are described at the GPO site.


United States Code

Title 40 published on 2015-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 40 CFR Part 141 after this date.

  • 2016-07-19; vol. 81 # 138 - Tuesday, July 19, 2016
    1. 81 FR 46839 - Expedited Approval of Alternative Test Procedures for the Analysis of Contaminants Under the Safe Drinking Water Act; Analysis and Sampling Procedures
      GPO FDSys XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Final rule.
      This action is effective July 19, 2016.
      40 CFR Part 141