NR 809.60(7)(c)(c) A public water system is in violation of the monitoring requirements for each quarter that a LRAA is calculated using a quarter in which the water supplier failed to monitor.

NR 809.61(1)(a)(a) A water supplier that submitted an IDSE report to EPA under Subpart U of 40 CFR part 141 shall begin monitoring at the locations and months recommended in the IDSE report submitted to EPA under Subpart U of 40 CFR part 141.605 following the schedule in s. NR 809.60 (3), unless the department requires other locations or additional locations after its review.

NR 809.61(1)(b)(b) A water supplier that submitted a 40/30 certification from EPA under Subpart U of 40 CFR part 141.603 or the department under s. NR 809.974 or for a public water system that qualified for a very small system waiver from EPA under Subpart U of 40 CFR 141.604 or the department under s. NR 809.975 or for a public water system that is a nontransient noncommunity water system serving <10,000, shall monitor at the location or locations and dates identified in the public water system’s monitoring plan in s. NR 809.565 (6), updated as required by s. NR 809.62.

NR 809.61(1)(c)(c) Monitoring shall be conducted at no fewer than the number of locations identified in Table Y.

NR 809.61(1)(d)(d) All public water systems shall be monitored during the month of highest DBP concentrations.

NR 809.61(1)(e)(e) Water suppliers for public water systems on quarterly monitoring shall take dual sample sets every 90 days at each monitoring location, except for water supplier for surface water systems or groundwater under the direct influence of surface water systems serving 500–3,300. Water suppliers for groundwater systems serving 500–9,999 on annual monitoring shall take dual sample sets at each monitoring location. All other public water systems on annual monitoring and surface water systems or groundwater under the direct influence of surface water systems serving 500–3,300 shall take individual TTHM and HAA5 samples, instead of a dual sample set, at the locations with the highest TTHM and HAA5 concentrations, respectively. For public water systems serving fewer than 500 people, only one location with a dual sample set per monitoring period is required if the highest TTHM and HAA5 concentrations occur at the same location and month.

NR 809.61(1)(f)(f) Water suppliers for undisinfected systems that begin using a disinfectant other than UV light after the dates for complying with the Initial Distribution System Evaluation requirements shall consult with the department to identify compliance monitoring locations for s. NR 809.60 and develop a monitoring plan under s. NR 809.62 that includes those monitoring locations.

NR 809.61(2)(a)(a) Samples shall be analyzed using an approved method listed in s. NR 809.563 (3) Table S for TTHM and HAA5.

NR 809.61(2)(b)(b) The analysis under par. (a) shall be conducted by laboratories that are certified by EPA or the department under ch. NR 149.

NR 809.62(1)(1) General monitoring plan requirements. Monitoring plans shall be developed, implemented and kept up to date by water suppliers for all public water systems that are required to be monitored for TTHMs and HAA5s and shall be kept on file for department and public review.

NR 809.62(1)(a)(a) Monitoring plans under this section shall be completed no later than the date the public water system is required to begin initial compliance monitoring under s. NR 809.60 (3).

NR 809.62(1)(b)(b) The monitoring plan shall contain the all of the following elements:

NR 809.62(1)(c)(c) If a public water system was not required to submit an IDSE report to the EPA under Subpart U of 40 CFR 141.601 or 141.602 and does not have sufficient monitoring locations to identify the required number of locations indicated in Subpart U of 40 CFR 141.605(b) or under s. NR 809.61; the water supplier shall do all of the following:

NR 809.62(1)(c)1.1. Identify additional locations by alternating selection of locations representing high TTHM levels and high HAA5 levels until the required number of compliance monitoring locations have been identified.

NR 809.62(1)(c)2.2. Provide the rationale for identifying the locations as having high levels of TTHM or HAA5. Water suppliers should compare the number of monitoring locations required under s. NR 809.565 with the number of monitoring locations under s. NR 809.61 Table Y. If the public water system was required to have more monitoring locations under s. NR 809.565 than under s. NR 809.62 compliance monitoring, the water supplier shall identify which locations will be used by alternating selection of locations representing high TTHM levels and high HAA5 levels until the required number of compliance monitoring locations under s. NR 809.61 Table Y have been identified.

NR 809.62(2)(2) Submittal of monitoring plans. If a public water system serves > 3,300 people, the water supplier shall submit a copy of a monitoring plan to the department prior to the date the water supplier for the public water system is required to conduct initial monitoring under s. NR 809.60 (3), unless the IDSE report submitted under Subpart U of 40 CFR part 141 of the Federal Regulation contains all the information required by this subsection.