My Backflow Preventer Is Leaking — What Should I Do?

Don't Panic, But Don't Ignore It

A leaking backflow preventer is a common issue with a known cause in most cases. How you should respond depends on the type and location of the leak.

Leak from the Relief Valve (RPZ Devices)

If you see water dripping or flowing continuously from the middle port (the relief valve) of an RPZ assembly, it means one of two things: one of the internal check valves has failed and the device is doing its job by discharging rather than allowing contamination, or debris has become lodged in a check valve seat, causing it to leak.

Either way, continuous relief valve discharge requires prompt attention. Schedule a repair service call. Do not ignore ongoing discharge — in addition to wasting water, it indicates the device is in a compromised state.

Leak from a Fitting, Test Cock, or Shutoff Valve

Minor leaks at threaded fittings or test cocks are typically caused by failing seals or loose connections. These are straightforward repairs. Contact us to schedule service.

Should I Shut Off the Water?

If the leak is causing flooding, damage to adjacent equipment, or flowing continuously at high volume, close the upstream shutoff valve on the backflow preventer to stop water flow. This will interrupt your water service to the protected area, but it is better than allowing ongoing water damage.

Do not attempt to open the relief valve manually or disassemble the device. Contact us to schedule service. 

Can a Leaking Device Still Protect Against Backflow?

A leaking RPZ with active relief valve discharge may still be providing some level of protection, but the device is out of proper operating condition and must be repaired. The annual test will confirm whether the device's internal components are functioning within acceptable tolerances.