40 CFR 143.3 - Secondary maximum contaminant levels.

The secondary maximum contaminant levels for public water systems are as follows:

Contaminant Level
Aluminum 0.05 to 0.2 mg/l.
Chloride 250 mg/l.
Color 15 color units.
Copper 1.0 mg/l.
Corrosivity Non-corrosive.
Fluoride 2.0 mg/l.
Foaming agents 0.5 mg/l.
Iron 0.3 mg/l.
Manganese 0.05 mg/l.
Odor 3 threshold odor number.
pH 6.5-8.5.
Silver 0.1 mg/l.
Sulfate 250 mg/l.
Total dissolved solids (TDS) 500 mg/l.
Zinc 5 mg/l.
These levels represent reasonable goals for drinking water quality. The States may establish higher or lower levels which may be appropriate dependent upon local conditions such as unavailability of alternate source waters or other compelling factors, provided that public health and welfare are not adversely affected.
[ 44 FR 42198, July 19, 1979, as amended at 51 FR 11412, Apr. 2, 1986; 56 FR 3597, Jan. 30, 1991]

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 10-May-2017 04:28

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 40 CFR Part 143 after this date.

  • 2017-04-11; vol. 82 # 68 - Tuesday, April 11, 2017
    1. 82 FR 17406 - Use of Lead Free Pipes, Fittings, Fixtures, Solder and Flux for Drinking Water; Extension of Comment Period
      GPO FDSys XML | Text
      Proposed rule; extension of comment period.
      Comments must be received on or before May 17, 2017.
      40 CFR Parts 141 and 143
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