Part 611: PRIMARY DRINKING WATER STANDARDS

Section 611.957 Reporting and Recordkeeping Requirements a) Reporting. This Subpart X requires a supplier to report several items to the Agency. Subsections (a)(1) through (a)(4) describe the items that must be reported and the frequency of reporting. (The supplier is required to…

Section 611.970 General Requirements a) General. The requirements of this Subpart Y constitute NPDWRs. The regulations in this Subpart Y establish monitoring and other requirements for achieving compliance with MCLs based on LRAAs for TTHM and HAA5, and for achieving compliance w…

Section 611.971 Routine Monitoring a) Monitoring 1) If a supplier submitted an IDSE report, it must begin monitoring at the locations and during the months that the supplier has recommended in its IDSE report submitted under Section 611.925, following the schedule in Section 611.…

Section 611.972 Subpart Y Monitoring Plan a) Development of a Monitoring Plan 1) A supplier must develop and implement a monitoring plan that it must keep on file for Agency and public review. The monitoring plan must contain the following elements, and it must be complete no lat…

Section 611.973 Reduced Monitoring a) A supplier may reduce monitoring to the level specified in the applicable of subsections (a)(1) through (a)(13), subject to the limitation of subsection (a)(14), any time the LRAA is 0.040 mg/ℓ or less for TTHM and 0.030 mg/ℓ or less for HAA5…

Section 611.974 Additional Requirements for Consecutive Systems If a supplier has a consecutive system that does not add a disinfectant but which delivers water that has been treated with a primary or residual disinfectant other than ultraviolet light, it must comply with the ana…

Section 611.975 Conditions Requiring Increased Monitoring a) If a supplier is required to monitor at a particular location annually or less frequently than annually pursuant to Section 611.971 or Section 611.973, it must increase monitoring to dual sample sets once per quarter (t…

Section 611.976 Operational Evaluation Levels a) A supplier has exceeded the operational evaluation level at any monitoring location where the sum of the two previous quarters' TTHM results plus twice the current quarter's TTHM result, divided by four to determine an average, exc…

Section 611.977 Requirements for Remaining on Reduced TTHM and HAA5 Monitoring Based on Subpart I Results A supplier may remain on reduced monitoring after the applicable dates identified in Section 611.970(c) for compliance with this Subpart Y only if the supplier fulfills each …

Section 611.978 Requirements for Remaining on Increased TTHM and HAA5 Monitoring Based on Subpart I Results If a supplier was on increased monitoring pursuant to Section 611.382(b)(1), it must remain on increased monitoring until it qualifies for a return to routine monitoring pu…

Section 611.979 Reporting and Recordkeeping Requirements a) Reporting 1) A supplier must report the following information to the Agency within ten days after the end of any quarter in which monitoring is required for each monitoring location: A) The number of samples taken during…

Section 611.APPENDIX A Regulated Contaminants Microbiological Contaminants Contaminant (units): Total Coliform Bacteria Traditional MCL in mg/ℓ: TT To convert for CCR, multiply by: MCL in CCR units: TT MCLG: N/A Major sources in drinking water: Naturally present in the environmen…

Section 611.TABLE Z Federal Effective Dates The following are the effective dates of the various federal NPDWRs: Fluoride (40 CFR 141.62(b)(1)) (corresponding with Section 611.301(b)) October 2, 1987 Phase I VOCs (40 CFR 141.61(a)(1) through (a)(8)) (corresponding with Section 61…