40 CFR 141.63 - Maximum contaminant levels (MCLs) for microbiological contaminants.

§ 141.63 Maximum contaminant levels (MCLs) for microbiological contaminants.
(a) The MCL is based on the presence or absence of total coliforms in a sample, rather than coliform density.
(1) For a system which collects at least 40 samples per month, if no more than 5.0 percent of the samples collected during a month are total coliform-positive, the system is in compliance with the MCL for total coliforms.
(2) For a system which collects fewer than 40 samples/month, if no more than one sample collected during a month is total coliform-positive, the system is in compliance with the MCL for total coliforms.
(b) Any fecal coliform-positive repeat sample or E. coli-positive repeat sample, or any total coliform-positive repeat sample following a fecal coliform-positive or E. coli-positive routine sample constitutes a violation of the MCL for total coliforms. For purposes of the public notification requirements in subpart Q, this is a violation that may pose an acute risk to health.
(c) A public water system must determine compliance with the MCL for total coliforms in paragraphs (a) and (b) of this section for each month in which it is required to monitor for total coliforms.
(d) The Administrator, pursuant to section 1412 of the Act, hereby identifies the following as the best technology, treatment techniques, or other means available for achieving compliance with the maximum contaminant level for total coliforms in paragraphs (a) and (b) of this section:
(1) Protection of wells from contamination by coliforms by appropriate placement and construction;
(2) Maintenance of a disinfectant residual throughout the distribution system;
(3) Proper maintenance of the distribution system including appropriate pipe replacement and repair procedures, main flushing programs, proper operation and maintenance of storage tanks and reservoirs, and continual maintenance of positive water pressure in all parts of the distribution system;
(4) Filtration and/or disinfection of surface water, as described in subpart H, or disinfection of ground water using strong oxidants such as chlorine, chlorine dioxide, or ozone; and
(5) For systems using ground water, compliance with the requirements of an EPA-approved State Wellhead Protection Program developed and implemented under section 1428 of the SDWA.
[54 FR 27566, June 29, 1989; 55 FR 25064, June 19, 1990, as amended at 65 FR 26022, May 4, 2000]

Title 40 published on 2014-07-01.

No entries appear in the Federal Register after this date, for 40 CFR Part 141.

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United States Code

Title 40 published on 2014-07-01

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

  • 2015-03-31; vol. 80 # 61 - Tuesday, March 31, 2015
    1. 80 FR 17020 - Notice of a Public Meeting: Regulations Implementing Section 1417 of the Safe Drinking Water Act: Prohibition on Use of Lead Pipes, Solder and Flux
      GPO FDSys XML | Text
      Notice of a public meeting.
      The public meeting will be held on April 14, 2015 (1 p.m. to 4:30 p.m., eastern time). This meeting will also be simultaneously broadcast as a webinar, available on the Internet. Persons wishing to participate in the meeting or webinar must pre-register by April 7, 2015, as described in the SUPPLEMENTARY INFORMATION section.
      40 CFR Part 141