NAC445A.66825. Disinfection of water: General requirements.

     1. In addition to any disinfection required pursuant to NAC 445A.526, a supplier of water shall provide for the continuous disinfection, in accordance with NAC 445A.66825 to 445A.6685, inclusive, of any groundwater used by the public water system which:

     (a) Does not comply with primary standards;

     (b) Is obtained from a well that is located or constructed in a manner that varies from the requirements of NAC 445A.65505 to 445A.6731, inclusive; or

     (c) Is distributed through a distribution system that is constructed in a manner that varies from the requirements of NAC 445A.65505 to 445A.6731, inclusive.

     2. A supplier of water shall:

     (a) Locate any facilities for disinfection in such a manner that the facilities are accessible throughout the entire year.

     (b) Provide adequate housing for equipment used for disinfection and for the storage of disinfectants.

     3. If a supplier of water proposes to use any disinfectants other than chlorine, including iodine, ozone, chlorine dioxide, chloramines or ultraviolet light, the supplier of water shall, before preparing the final plans and specifications for the facility, submit the proposal to and obtain the approval of the Division or the appropriate district board of health. If the supplier of water uses chlorine dioxide, ultraviolet light or ozone to inactivate Giardia lamblia cysts, viruses or Cryptosporidium for a public water system using surface water or groundwater under the direct influence of surface water, the disinfection practice must comply with the standards for disinfection set forth in NAC 445A.526.

     4. Chloramines may be used as a secondary disinfectant to maintain an effective residual of disinfectant in a distribution system only if the Division or the appropriate district board of health, after conducting an evaluation of each proposal for such a use on a case-by-case basis, determines that chloramines are suitable for that use.

     (Added to NAC by Bd. of Health, eff. 2-20-97; A by Environmental Comm’n by R194-08, 10-27-2009; R061-10, 7-22-2010)