Section 327IAC8-2.6-1. General requirements; enhanced filtration and disinfection

   (a) Upon the effective date of this rule, unless otherwise specified in this section, all Subpart H systems serving a population of at least ten thousand (10,000) individuals and, beginning January 1, 2005, systems serving a population of fewer than ten thousand (10,000) individuals shall establish treatment technique requirements instead of MCLs for the following contaminants:

(1) Giardia lamblia.

(2) Viruses.

(3) Heterotrophic plate count bacteria.

(4) Legionella.

(5) Cryptosporidium.

(6) Turbidity.

The systems shall also provide treatment of their source water that complies with these treatment technique requirements in addition to those identified in 327 IAC 8-2-8.5.

  (b) The treatment technique requirements consist of installing and properly operating water treatment processes that reliably achieve the following:

(1) At least ninety-nine percent (99%) (2-log) removal of Cryptosporidium between a point where the raw water is not subject to recontamination by surface water run-off and a point downstream before or at the first customer for filtered systems or Cryptosporidium control under the water shed control plan for unfiltered systems.

(2) Compliance with the profiling and benchmark requirements under section 2 of this rule for systems serving a population of at least ten thousand (10,000) individuals and, beginning January 1, 2005, section 2.1 of this rule for systems serving a population of fewer than ten thousand (10,000) individuals.

  (c) A public water system subject to this section is considered to be in compliance with subsections (a) and (b) if it meets the:

(1) disinfection requirements in 327 IAC 8-2-8.6 and section 2 of this rule; or

(2) applicable filtration requirements in either 327 IAC 8-2-8.5 or section 3 of this rule and the disinfection requirements in 327 IAC 8-2-8.6 and section 2 of this rule;

for systems serving a population of at least ten thousand (10,000) individuals and, beginning January 1, 2005, section 2.1 of this rule for systems serving a population of fewer than ten thousand (10,000) individuals.

  (d) Subpart H systems are not permitted to begin construction of uncovered finished water storage facilities after the effective date of this rule.

  (e) Subpart H systems that did not conduct optional monitoring under section 2 of this rule when such monitoring was required because they served fewer than ten thousand (10,000) individuals but served more than ten thousand (10,000) individuals prior to January 1, 2005, must comply with this section and sections 3 through 5 of this rule. These systems must also consult with the commissioner to establish a disinfection benchmark. A system that decides to make a significant change to its disinfection practice, as described in section 2(c)(1)(A) through 2(c)(1)(D) of this rule must consult with the commissioner before making such change. (Water Pollution Control Division; 327 IAC 8-2.6-1; filed May 1, 2003, 12:00 p.m.: 26 IR 2854; filed Jun 13, 2005, 2:30 p.m.: 28 IR 3247; errata filed Aug 22, 2005, 2:55 p.m.: 29 IR 30)