NAC445A.6723. Cross-connections and backflow: Installation of air gap.

Except as otherwise authorized by the Division or the appropriate district board of health, if an air gap is installed on a service connection:

     1. The air gap must be located as closely as practicable to the service connection, on the opposite side of the service connection from the public water system.

     2. All piping from the service connection to the receiving tank must be above grade and visible.

     3. There must be no type of outlet, tee, tap, take-off or connection to or from the service line between the service connection and the air gap.

     4. Expansion tanks or pressure relief valves must be provided as appropriate for the potential threat of water hammer and thermal expansion.

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