Section 445A.6719 - Cross-connections and backflow: Assemblies for prevention of backflow1. Except as otherwise provided in section 4 of this regulation, each, each service connection must have an assembly for the prevention of backflow, of a type that is commensurate with the degree of hazard that exists on the property of the customer of a public water system. Except as otherwise provided in NAC 445A.67185 to 445A.67255, inclusive, and section 4 of this regulation, the assembly may consist of any one of the following, as listed in the order of least to most protection: (a) A double check valve assembly.(b) A reduced pressure principle assembly.2. A reduced pressure principle assembly may be substituted for a double check valve assembly, and an air gap may be substituted for a reduced pressure principle assembly.3. With the approval of the supplier of water: (a) A double check detector check assembly may be substituted for a double check valve assembly; and(b) A reduced pressure detector assembly may be substituted for a reduced pressure principle assembly.4. A double check valve assembly or double check detector check assembly may be used only for protection against pollution.5. A reduced pressure principle assembly or reduced pressure detector assembly may be used for protection against pollution or contamination, but a reduced pressure principle assembly must not be used for protection against sewage or reclaimed wastewater.6. An assembly for the prevention of backflow must not be composed solely of a single check valve.Nev. Admin. Code § 445A.6719
Added to NAC by Bd. of Health, eff. 2-20-97; A by R049-18A, eff. 8/21/2018