NAC445A.5195. General requirements for monitoring quality of source water to determine bin classification.

     1. Each supplier of water shall monitor the quality of the source water of the public system to determine the bin classification, in accordance with 40 C.F.R. §§ 141.701 to 141.707, inclusive, as adopted by reference in NAC 445A.4525, in the following manner:

     (a) For a source which existed on or before July 1, 2008, the supplier shall monitor the quality of the source water pursuant to the parameters and schedule set forth in 40 C.F.R. § 141.701, as adopted by reference in NAC 445A.4525.

     (b) For a new source of water used after July 1, 2008, the supplier shall monitor the quality of the source water pursuant to the parameters prescribed in 40 C.F.R. § 141.701, as adopted by reference in NAC 445A.4525, according to a schedule which is approved by the Division. The supplier shall:

          (1) Submit the schedule at least 1 month before sampling; and

          (2) Provide in the schedule for at least 12 months of results from monitoring the quality of the source water before the approval of design and construction pursuant to NAC 445A.6669, unless the Division approves an alternate schedule.

     2. In accordance with 40 C.F.R. § 141.711(d), as adopted by reference in NAC 445A.4525, additional monitoring of the quality of the source water may be required if the quality of the source water changes in such a way as to indicate an increased risk of Cryptosporidium contamination. The determination to perform additional monitoring of the quality of the source water must be based on the results of:

     (a) For a filtered system, the performance of the sanitary survey of the watershed required by NAC 445A.5265 or 445A.539; or

     (b) For an unfiltered system, the watershed control program or monitoring required pursuant to NAC 445A.525.

     3. After monitoring the quality of the source water, the bin classification for public water systems must be calculated and reported to the Division pursuant to 40 C.F.R. § 141.710 or 141.712(a), as adopted by reference in NAC 445A.4525.

     4. A supplier of water who is required to meet the requirements for treatment pursuant to 40 C.F.R. § 141.711 or 141.712(b), as adopted by reference in NAC 445A.4525, shall:

     (a) Comply with the requirements for treatment on the schedule set forth in 40 C.F.R. § 141.713, as adopted by reference in NAC 445A.4525; and

     (b) Use the microbial toolbox options in accordance with 40 C.F.R. § 141.715, as adopted by reference in NAC 445A.4525.

     5. The Commission will not grant a variance from the provisions of this section.

     (Added to NAC by Environmental Comm’n by R194-08, eff. 10-27-2009)