Section 327 IAC 8-2-7 - Microbiological contaminants; maximum contaminant levels for all PWSsAuthority: IC 13-13-5; IC 13-14-8-2; IC 13-14-8-7; IC 13-18-3-1; IC 13-18-3-2; IC 13-18-16-8; IC 13-18-16-9
Affected: IC 13-18-2; IC 13-18-16
Sec. 7.
(a) Until March 31, 2016, the total coliform MCL applies to all PWSs and is based on the presence or absence of total coliforms in a sample, rather than coliform density. The PWS is in compliance with the MCL for total coliforms if it meets the following:(1) Not more than five and zero-tenths percent (5.0%) of the samples collected during a month are total coliform-positive for a PWS that collects at least forty (40) samples per month.(2) Not more than one (1) sample collected during a month is total coliform-positive for a PWS that collects fewer than forty (40) samples per month.(b) Until March 31, 2016, any of the following constitutes a violation of the MCL for total coliforms: (1) A fecal coliform-positive repeat sample.(2) An E. coli-positive repeat sample.(3) A total coliform-positive repeat sample following a fecal coliform-positive or E. coli-positive routine sample. For purposes of the public notification requirements in 327 IAC 8-2.1-7 through 327 IAC 8-2.1-16, the violations described in subdivisions (1) through (3) may pose an acute risk to health.
(c) Beginning April 1, 2016, a PWS: (1) is in compliance with the MCL for E. coli for samples taken in accordance with 40 CFR 141, Subpart Y*, unless one (1) or more of the conditions identified in subdivision (2) occurs; and(2) shall follow the public notification requirements in 327 IAC 8-2.1-7 through 327 IAC 8-2.1-16 for violations of the MCL that may pose an acute risk to human health when a PWS: (A) has an E. coli-positive repeat sample following a total coliform-positive routine sample;(B) has a total coliform-positive repeat sample following an E. coli-positive routine sample;(C) fails to take all required repeat samples following an E. coli-positive routine sample; or(D) fails to test for E. coli when any repeat sample tests positive for total coliform.(d) A PWS shall determine compliance with the MCL for the following:(1) Total coliforms according to subsections (a) and (b) until March 31, 2016, for each month in which the PWS is required to monitor for total coliforms.(2) E. coli according to subsection (c) beginning April 1, 2016, for each month in which the PWS is required to monitor for total coliforms. (e) The following are BAT, treatment techniques, or other means available for achieving compliance with the MCL for total coliforms in subsections (a) and (b) and the MCL for E. coli in subsection (c)(2)(A): (1) Protection of wells from fecal contamination by appropriate placement and construction.(2) Maintenance of a disinfectant residual throughout the distribution system.(3) Proper maintenance of the distribution system, including the following:(A) Appropriate pipe replacement and repair procedures.(B) Main flushing programs.(C) Proper operation and maintenance of storage tanks and reservoirs.(D) Cross connection control.(E) Continual maintenance of positive water pressure in all parts of the distribution system.(4) Either or both of the following:(A) As described in sections 8.5 and 8.6 of this rule, either or both of the following:(i) Filtration of surface water. (ii) Disinfection of surface water.(B) Disinfection of ground water, as described in 40 CFR 141, Subpart Y*, using strong oxidants such as one (1) or more of the following:(5) For a PWS using ground water, compliance with the requirements of a U.S. EPA approved wellhead protection program developed and implemented under 327 IAC 8-4.1.(f) For a PWS serving ten thousand (10,000) or fewer people, the commissioner, according to Section 1412 of the Safe Drinking Water Act, shall identify the technology, treatment techniques, or other means available identified in subsection (e) as affordable technology, treatment techniques, or other means available for achieving compliance with the MCL for:(1) total conforms in subsections (a) and (b); and(2) E. coli in subsection (c). *This document is incorporated by reference. Copies may be obtained from the Government Publishing Of Fice, www.gpo.gov, or are available for review at the Indiana Department of Environmental Management, Office of Legal Counsel, Indiana Government Center North, 100 North Senate Avenue, Thirteenth Floor, Indianapolis, Indiana 46204.
Water Pollution Control Board; 327 IAC 8-2-7; filed Sep 24, 1987, 3:00 p.m.: 11 IR 707; filed Dec 28, 1990, 5:10 p.m.: 14 IR 1018; filed Apr 12, 1993, 11:00 a.m.: 16 IR 2154; filed Nov 20, 2001, 10:20 a.m.: 25 IR 1092Filed 1/18/2017, 1:01p.m.: 20170215-IR-327140059FRA