NAC445A.525. Filtration: Avoidance of requirements.

     1. A supplier of water may apply to the Division to operate without installing a system for filtration. The Division may grant the request if the supplier of water, not later than December 30, 1991, or 18 months after notification by the Division or the appropriate district board of health that a groundwater system is under the direct influence of surface water, whichever is later, meets the requirements set forth in 40 C.F.R. §§ 141.71, 141.171, 141.520, 141.521 and 141.522, as adopted by reference in NAC 445A.4525. For the Division to determine the adequacy of a watershed control program for a system located at Lake Tahoe, the supplier of water must demonstrate that a level of protection which minimizes the potential for contamination by Giardia lamblia cysts, viruses and Cryptosporidium is provided by the location of the intake structure and a watershed control program.

     2. A supplier of water shall obtain raw samples of the source water to test for Giardia lamblia cysts, viruses and Cryptosporidium before conducting any treatment on a schedule prescribed by the Division.

     3. To avoid the requirements for filtration, a supplier of water must comply with the provisions set forth in 40 C.F.R. §§ 141.74(b), 141.75(a) and 141.712, as adopted by reference in NAC 445A.4525. Additional information on obtaining approval to operate without filtration is outlined in the Guidance Manual for Compliance with the Filtration and Disinfection Requirements for Public Water Systems Using Surface Water Sources, 1991 edition, product code PB93-222933. This document is available at a cost of $124 from the National Technical Information Service, 5285 Port Royal Road, Springfield, Virginia 22161, or at the Internet address http://www.ntis.gov.

     (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)