Installation Permit Guide

Backflow Prevention Assembly Installation Guide

  • The backflow prevention assembly should be as close to the water meter or service
  • connection as possible. In all cases it shall be before the first branch in the water service.
  • Call for more information about isolation backflow assemblies.
  • The double check valve and reduced pressure assemblies shall be installed at least 12
  • inches above the finished grade, flood level, or floor.
  • The maximum installation height of a backflow prevention assembly is sixty inches.
  • An enclosure shall be provided that protects the assembly from theft, vandalism,
  • tampering, weather, and freezing.
  • In the floor, underground, and vault installations are prohibited.
  • There shall be 12 inches clearance on all sides of the assembly.
  • Electrical equipment, outlets and breaker boxes shall not be located beneath the assembly.
  • Only in-line testable assemblies approved by the USC Foundation for Cross Connection
  • Control or ASSE shall be accepted.
  • The type of assembly shall be appropriate for the hazard as identified by the Community
  • Compliance Office
  • Prior to installing assemblies it is recommended that the Community Compliance Office
  • be contacted to verify that the type of assembly being used is appropriate for the hazards.
  • Installation, relocation, replacement, and removal of backflow prevention assemblies
  • require a CFPUA permit and inspection and a separate New Hanover County plumbing
  • permit and inspection. Water meters will not be set until the CFPUA has inspected and
  • approved the backflow prevention assembly and its installation.
  • It is the responsibility of the installer to ensure that backflow prevention assemblies
  • function properly and are tested by a certified tester within 15 days of the installation.