Current through September 18, 2024
Authority: 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:
(i)
Chlorine.
(ii) Chlorine
dioxide.
(iii) Ozone.
(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.
