Indiana Administrative Code
Title 327 - WATER POLLUTION CONTROL DIVISION
Article 8 - PUBLIC WATER SUPPLY
Rule 2.5 - Disinfectants and Disinfection
Section 2.5-20 - Reporting and record keeping requirements; stage 2 disinfection byproducts requirements

Universal Citation: 327 IN Admin Code 2.5-20

Current through December 25, 2024

Authority: IC 13-13-5; IC 13-14-8-7; IC 13-14-9; IC 13-18-3-2; IC 13-18-16

Affected: IC 13-18-3-11

Sec. 20.

(a) The following are the reporting requirements for the TTHM and HAA5 monitoring under this rule:

(1) A PWS shall report the following information for each monitoring location to the commissioner within ten (10) days after the end of any quarter in which monitoring is required:
(A) The number of samples taken during the last quarter.

(B) The date and results of each sample taken during the last quarter.

(C) LRAA calculations including the following information:
(i) The arithmetic average of quarterly results for the last four (4) quarters for each monitoring location, beginning at the end of the fourth calendar quarter that follows the compliance date and at the end of each subsequent quarter.

(ii) If the LRAA, calculated based on fewer than four (4) quarters of data, would cause the MCL to be exceeded regardless of the monitoring results of subsequent quarters, the PWS shall report this information to the commissioner as part of the first report due following the compliance date or anytime thereafter that this determination is made.

(iii) If a PWS is required to conduct monitoring at a frequency that is less than quarterly, the PWS shall make compliance calculations beginning with the first compliance sample taken after the compliance date, unless the PWS is required to conduct increased monitoring under section 16 of this rule.

(D) Whether, based on sections 2(b)(1) and 11 through 19 of this rule and this section, the MCL was violated at any monitoring location.

(E) Any operational evaluation levels that were exceeded during the quarter, including the following information:
(i) The location.

(ii) The date.

(iii) The calculated TTHM and HAA5 levels.

(2) If a Subpart H system is seeking to qualify for or remain on reduced TTHM and HAA5 monitoring, the Subpart H PWS shall report the following source water TOC information for each treatment plant that treats surface water or ground water under the direct influence of surface water to the commissioner within ten (10) days after the end of any quarter in which monitoring is required:
(A) The number of source water TOC samples taken each month during the last quarter.

(B) The date and result of each sample taken during the last quarter.

(C) The quarterly average of monthly samples taken during the last quarter or the result of the quarterly sample.

(D) The running annual average (RAA) of quarterly averages from the past four (4) quarters.

(E) Whether the RAA exceeded four and zero-tenths (4.0) milligrams per liter.

The commissioner may choose to perform calculations and determine whether the MCL was exceeded or the system is eligible for reduced monitoring in lieu of having the system report that information.

(b) Each PWS subject to sections 11 through 19 of this rule and this section shall retain monitoring plans and monitoring results as required by this section.

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