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What is a Backflow Device?

A backflow prevention device is used to protect pottable water supplies from contamination or pollution due to backflow and back-siphonage.


A typical backflow assembly has test cocks and shut off valves, and must be tested when installed, if relocated or repaired, and also on a periodic basis.


How often should Backflow Prevention be inspected?

Reduced Pressure Zone (RPZ) assembly needs to be tested annually and rebuilt every 5 years. Double Check Valve (DCV) assembly needs to be tested every 3 years.

What causes Backflow in plumbing?

There are two main causes of backflow in plumbing – back pressure and back siphonage. Back pressure is when water is forced to flow in the opposite direction. Back siphonage occurs when the pressure in the water supply becomes smaller than the pressure in the plumbing system.

What is a Backflow report?

A backflow device is also known as an RPZ valve. RPZ stands for Reduced Pressure Zone. This device is installed onto your plumbing system to protect your drinking water and the city water supply from contaminants.

How is a Backflow test performed?

Our certified inspector is required to test backflow devices. The test kit uses the water left in the backflow. Once the test is complete, the kit is removed, and the water is turned back on slowly, which prevents pressure surges from occurring.

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