(A) A public water system which monitors with at least forty samples per month is in compliance with the maximum contaminant level for total coliforms when no more than 5.0 per cent of the total number of samples during a month are total coliform-positive.
(B) A public water system which monitors with fewer than forty samples per month is in compliance with the maximum contaminant level for total coliforms when no more than one sample during a month is total coliform-positive.
(C) A public water system is in violation of the maximum contaminant level for total coliforms, and may pose an acute risk to human health, if any repeat sample collected in accordance with rule 3745-81-21 of the Administrative Code is
(1) Fecal coliform-positive, or
(2) Escherichia coli-positive (E. coli-positive), or
(3) Total coliform-positive following a fecal coliform-positive routine sample, or
(4) Total coliform-positive following an E. coli-positive routine sample.
(D) A public water system shall determine compliance with the maximum contaminant level for total coliforms as set forth in paragraphs (A), (B), and (C) of this rule for each period in which the public water system is required to monitor for total coliforms.
(E) A public water system which exceeds any maximum contaminant level for total coliforms set forth in paragraph (A), (B), and (C) of this rule shall:
(1) Report the violation to the director no later than the end of the next business day after the public water system learns of the violation, and
(2) Notify the public in accordance with rule 3745-81-32 of the Administrative Code, and
(3) Determine the source of contamination, and
(4) Eliminate the source of contamination.
(F) The director may determine that a public water system shall apply best available technology in order to reduce the level of a contaminant to below its maximum contaminant level. The best available technology for achieving compliance with the maximum contaminant level for total coliforms as set forth in this rule shall be:
(1) Protection of wells from contamination by coliforms by appropriate placement and construction in accordance with Chapter 3745-9 of the Administrative Code; and
(2) Maintenance of a disinfectant residual throughout the distribution system in accordance with rule 3745-81-72 of the Administrative Code and paragraph (C) of rule 3745-83-01 of the Administrative Code; and
(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, continual maintenance of positive water pressure in all parts of the distribution system, and backflow prevention as described in Chapter 3745-95 of the Administrative Code; and
(4) Filtration and disinfection by public water systems using surface water, in whole or in part, as required by rules 3745-81-71 to 3745-81-75 of the Administrative Code, or disinfection of ground water using strong oxidants such as chlorine, chlorine dioxide, or ozone; and
(5) Where appropriate, the development and implementation of a source water assessment and protection program approved by the director.
119.032 review dates:
Promulgated Under: 119.03
Statutory Authority: 6109.04
Rule Amplifies: 6109.04
Prior Effective Dates: 12/27/78, 11/26/80, 3/1/88, 5/22/89, 12/31/90, 9/13/93, 4/1/99, 8/3/04