Section 327IAC8-2.6-7. General requirements; enhanced treatment for Cryptosporidium

   (a) The requirements of this section and sections 8 through 22 of this rule establish or extend treatment technique requirements in lieu of MCLs for Cryptosporidium. These requirements are in addition to requirements for filtration and disinfection under the following:

(1) 327 IAC 8-2-8.5.

(2) 327 IAC 8-2-8.6.

(3) 327 IAC 8-2-8.7.

(4) 327 IAC 8-2-8.8.

(5) 327 IAC 8-2-14.

(6) Sections 1 through 5 of this rule.

  (b) The requirements of this section and sections 8 through 22 of this rule apply to the following:

(1) Subpart H systems supplied by a surface water source.

(2) PWSs supplied by a surface water source.

(3) PWSs supplied by a ground water source under the direct influence of surface water.

(4) Wholesale systems, as defined under 327 IAC 8-2-1. These systems shall comply with the requirements of this section and sections 8 through 22 of this rule based on the population of the largest system in the combined distribution system.

(5) PWSs that are required to provide filtration treatment, whether or not the system is currently operating a filtration system.

  (c) A PWS subject to this rule shall comply with the following requirements:

(1) A PWS shall conduct an initial and a second round of source water monitoring for each water treatment plant that treats a surface water or ground water under the direct influence of surface water source. This monitoring may include sampling for:

(A) Cryptosporidium;

(B) E. coli; and

(C) turbidity;

as described under 40 CFR 141.701 through 40 CFR 141.706, as incorporated by reference in section 8(a) of this rule, to determine what level, if any, of additional Cryptosporidium treatment the PWS shall provide.

(2) A PWS that plans to make a significant change to its disinfection practice shall:

(A) develop disinfection profiles; and

(B) calculate disinfection benchmarks;

as described under sections 9 and 10 of this rule.

(3) A filtered system shall comply with the following:

(A) Determine its Cryptosporidium treatment bin classification as described under section 11 of this rule.

(B) Provide additional treatment for Cryptosporidium, if required, as described under section 12 of this rule.

(C) Implement Cryptosporidium treatment according to the applicable compliance date under section 13 of this rule.

(4) A PWS with uncovered finished water storage facilities shall comply with the requirements to:

(A) cover the facility; or

(B) treat the discharge from the facility;

as described under section 14 of this rule.

(5) A PWS that is required to provide additional treatment for Cryptosporidium shall implement microbial toolbox options that are designed and operated as described under sections 15 through 20 of this rule.

(6) A PWS shall comply with the applicable record keeping and reporting requirements described under sections 21 and 22 of this rule.

(Water Pollution Control Division; 327 IAC 8-2.6-7; filed May 7, 2010, 9:30 a.m.: 20100602-IR-327080198FRA)