Reduced Pressure Zone (RPZ) Valves

The process you must follow for RPZ valves.

Reduced Pressure Zone (RPZ) Valves are devices that prevent backflow. They protect against backflow of fluids that can be a significant health risk. To follow the rules, you must install them correctly. They should undergo regular testing to demonstrate that they protect against backflow and do not waste water.

RPZ installation checklist

This Approved Installation Method (AIM) sets out requirements for the installation, commissioning, and periodic testing of RPZ valves.

RPZ approved installation method

Notification

You must notify us when you:

  • Install an RPZ valve
  • Relocate an RPZ valve
  • Extend or alter plumbing with an RPZ valve
  • Change the use of plumbing with an RPZ valve
  • Disconnect plumbing with an RPZ valve

You must send notifications to Bristol Water at least 10 working days before the work starts, using one of the following forms.

Intention to install, relocate or replace RPZ form Intention to remove RPZ form

Test Report

A test report is valid only if a competent PRZ valve tester conducts on-site testing of a RPZ valve. You can search for a local tester here: WaterSafe | Local Approved Plumbers

Acceptable test report forms can be found below.

RPZ valve commissioning report form RPZ valve compliance test report form

Submission of RPZ test report

Test report must be sent to the address below or emailed to waterregulations@bristolwater.co.uk within 10 working days of the set test interval or following repair, dismantling and relocation.

Test Failures

The RPZ AIM identifies the action which must be taken if test failures occur. Contact details for the Water Regulations team can be found below.

Contact Details