NAC445A.527. Requirements for monitoring.

     1. Except as otherwise provided in this section, each supplier of water shall, on or after June 29, 1993, or on the date the system for filtration is installed, whichever is later, meet the requirements set forth in 40 C.F.R. §§ 141.74, 141.174 and 141.560 to 141.564, inclusive, and the applicable components of the requirements for monitoring within the microbial toolbox set forth in 40 C.F.R. §§ 141.716 to 141.720, inclusive, as adopted by reference in NAC 445A.4525.

     2. A supplier of water shall measure and record the parameters that are needed to determine compliance with the requirements for concentration times time, including, but not limited to:

     (a) The temperature of the disinfected water;

     (b) The pH of the disinfected water, if chlorine is used as a disinfectant;

     (c) The disinfectant contact time; and

     (d) The concentration of the residual disinfectant before or at the point the water reaches the first customer.

     3. A supplier of water shall measure the concentration of residual disinfectant or heterotrophic plate count within the distribution system at the same frequency and at the same time and location as total coliforms are measured. A supplier of water that uses both a source of surface water or groundwater under the direct influence of surface water, and a source of groundwater that is not under the direct influence of surface water, may petition the Division or the appropriate district board of health for alternate sampling locations if the supplier of water demonstrates that these sampling points are more representative of the disinfected surface water or groundwater under the direct influence of surface water in the distribution system.

     (Added to NAC by Bd. of Health, eff. 11-29-90; A by R088-00, 8-3-2001; A by Environmental Comm’n by R126-05, 10-31-2005; R194-08, 10-27-2009)