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Message last updated - Saturday 28th March 2026
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Message last updated - Saturday 28th March 2026
Message last updated - Saturday 28th March 2026
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If you're planning to install a Reduced Pressure Zone (RPZ Valve) then you'll need to get permission from us before you start.
The RPZ valve's are mechanical devices that provide backflow protection against fluid category 4 which represents significant health risks. Find out more information on our processes, installation, testing and reporting below.
Installation - ‘Approved Installation Method AIM Issue 3’ provided by Water Regs UK sets out the requirements for installation, on-site testing and maintenance. Submit your application to install online.
Annual Testing - We're required to monitor all RPZ valve installations in our water supply area. All valves must be tested on an annual basis. Approved Testers must submit test data via our online form.
Reporting an RPZ valve test failure - If the RPZ valve fails the compliance test but is repaired and satisfactorily retested immediately then the data should be submitted using our online form. In the event of a test failure where an RPZ Valve cannot be repaired and satisfactorily retested immediately the tester shall notify the water undertaker within 24 hours to agree a course of action, please see contact details below.
Frequently asked questions