Water Supply Industry Interpretations and Advice

  • Area of Interest : Backflow prevention
  • Topic : Whole site and zone backflow prevention
  • Title : Verifiable check valves installed below ground
  • Clause Reference : Schedule 2 paragraph 15(4) & G15.24
  • Reference Number : B32
  • Decision Date : September 2004

Where whole site and zone backflow protection is required a water supplier may accept, subject to a risk assessment and providing that it is located in a chamber of adequate size to allow for maintenance, the installation of a verifiable check valve below ground.