Backflow Prevention and Testing in Cheshire

Where backflow risk comes up

• Garden hose connections left submerged in a water butt or pond, which can draw contaminated water back into the mains under certain conditions
• Commercial premises with processes involving chemicals or non-potable water connected anywhere near the mains-fed system
• Irrigation systems, which often connect directly to the mains and need proper backflow protection
• Boiler and heating system connections, particularly where chemical inhibitors are added to a heating system that's connected to the mains water supply for filling

Installing backflow prevention

We fit appropriate backflow prevention devices based on the level of risk involved. Simple risks, like an outdoor tap, might only need a basic non-return valve. Higher risk situations, particularly in commercial settings, need more robust devices like double check valves or reduced pressure zone valves, and the right choice depends entirely on what's connected and the contamination risk it presents.

Testing existing backflow devices

Backflow prevention devices, particularly higher-risk types used in commercial settings, need periodic testing to confirm they're still working correctly. A backflow device that's failed silently provides no protection at all, which defeats the purpose of having it fitted in the first place. We carry out testing and provide documentation confirming the device's condition and performance.

Why this is taken seriously by water companies

Water companies have a genuine interest in preventing backflow contamination, since a single contaminated connection can theoretically affect the wider supply network depending on how the system is configured. This is why certain installations, particularly commercial ones, require documented backflow prevention as a condition of connection.