RPZ Valves

Type BA backflow protection devices are more commonly known as Reduced Pressure Zone valves or RPZ valves. It is a legal requirement to have these devices checked on a regular basis, at least yearly, to ensure they provide the backflow protection required.

All installations, commissioning and testing must be carried out in accordance with the Water Suppliers’ Approved Installation Method AIM-08-01. The commissioning and testing of these valves must only be carried out by an accredited tester approved by the local water supplier. 

What are my duties?

• Test the RPZ valve annually to ensure operational efficiency

• Engage a fully qualified RPZ valve tester

• Provide a copy of the annual testing report to the water utility company


  • Are fully trained and accredited to complete all RPZ works by WRAS

  • Provide installation, commissioning, testing and repair services

  • Can carry out any pipework alterations to comply with the Water Supply (Water Fittings) Regulations 1999

  • Provide annual test reminders for compliance

Legal duties

HASWA 1974, Water Supply (Water Fittings) Regulations 1999.