Ensuring Safety and Compliance in Water Systems
When it comes to protecting potable water supplies from contamination, few components are as critical as the Reduced Pressure Zone (RPZ) valve. At Plumbing & Gas Solutions, we understand the importance of safeguarding your commercial or industrial water system, and RPZ valve testing plays a vital role in achieving this. In this article, we provide a detailed overview of what RPZ valves are, how they work, who is authorised to test them, and why regular testing is not only necessary, but legally required.
What Is an RPZ Valve?
An RPZ valve, or Reduced Pressure Zone valve, is a backflow prevention device designed to protect mains water from contamination due to back siphonage or back pressure. These issues can arise when there’s a sudden drop in water pressure or when non-potable water is forced back into the clean supply line, posing serious health risks.
RPZ valves are typically installed in commercial premises where there is a higher risk of contaminants such as industrial chemicals, cleaning agents, or waste fluids entering the drinking water supply. Sectors such as food production, medical facilities, manufacturing, and even large office buildings often require RPZ installations to ensure water safety and compliance with water regulations.
What Does an RPZ Valve Do?
The RPZ valve consists of two independent check valves separated by a pressure-monitored zone. If either check valve fails, the reduced pressure in the zone allows water to discharge safely rather than backflowing into the potable supply. This means the RPZ valve acts as a critical barrier, ensuring any contaminants cannot reach the drinking water system.
Why RPZ Valve Testing Matters
Backflow incidents can have serious consequences. Contaminants such as fertilisers, pathogens, chemicals, or wastewater can be drawn into the drinking water supply, posing significant risks to health and safety.
In the UK, this risk is taken seriously. Under the Water Supply (Water Fittings) Regulations 1999, RPZ valves are classified as Type BA devices and are subject to strict testing, maintenance, and registration requirements. Failure to comply can lead to enforcement action, including supply disconnection or prosecution.
Who Is Qualified to Carry Out RPZ Valve Testing?
Testing and maintenance of RPZ valves must be conducted by a WRAS approved RPZ valve tester. This is a legal requirement in the UK, and only individuals certified under the Water Regulations Advisory Scheme (WRAS) are qualified to carry out this task.
At Plumbing & Gas Solutions, our engineers are not only WRAS-certified but also highly experienced in RPZ valve testing and compliance. Our team ensures every test meets the standards required by local water authorities and relevant legislation.
What Does RPZ Valve Testing Involve?
RPZ valve testing is a structured and regulated procedure, typically including:
- Visual Inspection – Assessing the physical condition of the valve and ensuring it is correctly installed and accessible.
- Functional Checks – Testing the operation of the check valves and relief valve using specialist equipment.
- Pressure Monitoring – Measuring the pressure within the reduced pressure zone to verify it remains within acceptable limits.
- Leak Detection – Identifying any leaks or signs of failure.
- Certification – Issuing a test report and certificate to confirm compliance, which is also shared with your local water authority if required.
If any faults or failures are found during the test, our engineers can advise on immediate remedial action, including repair or full replacement where necessary.
Common Applications of RPZ Valves
RPZ valves are typically required in environments where the risk of contamination is higher than average. These include:
- Hospitals, clinics, and dental surgeries
- Manufacturing and chemical processing facilities
- Commercial laundries and dry cleaners
- Car washes and vehicle valeting stations
- Commercial kitchens and food processors
- Agricultural and horticultural sites
- Schools, universities, and leisure centres
If you’re unsure whether your site needs an RPZ valve or whether it’s due for testing, we can help assess your system and advise accordingly.
Call us on 01908 569031 or email info@pgsolutions.co.uk to book an assessment visit.
When Is RPZ Valve Testing Required and How Often?
RPZ valve testing is not optional; it is a legal requirement under UK water regulations.
Testing must be carried out at least once every 12 months by a certified RPZ tester. This ensures the device is functioning correctly and continues to prevent contaminated water from entering the clean supply.
In addition to annual testing, you are also required to retest the RPZ valve:
- Immediately after installation
- After any maintenance or part replacement
- If the valve is moved or relocated
- If requested by your local water authority
- Following a suspected backflow incident
Water companies may conduct audits or request evidence of recent test certificates. Failure to comply can lead to fines or even temporary disconnection of your water supply.
Stay Compliant with Scheduled Testing
At Plumbing & Gas Solutions, we offer scheduled annual testing services with automatic reminders—so you’ll never miss a compliance deadline. Our streamlined approach ensures:
- Full regulatory compliance
- Transparent certification process
- Professional advice on upgrades or replacements if needed
- Liaison with water authorities on your behalf
Why Choose Plumbing & Gas Solutions?
With over 15 years of experience in commercial water services, Plumbing & Gas Solutions is trusted across the area for our technical expertise and dependable service. We provide full RPZ valve installation, testing, and certification services to ensure your business remains compliant and protected.
RPZ valve testing is not just a regulatory requirement—it’s a critical safeguard for public health and water safety. By ensuring your valves are professionally tested and maintained, you’re doing your part to protect your property, your staff, and your community.
Protect Your Water Supply with Certified RPZ Testing
If you need expert RPZ valve testing or are unsure about your compliance requirements, contact Plumbing & Gas Solutions.
Call us today on 01908 569031 email info@pgsolutions.co.uk or fill out our online contact form.
Our team is ready to assist with professional advice and efficient service!