A regional Cross Connection Control Program designed to safeguard Greater Victoria’s Drinking Water System from contaminated water flowing backwards into the public water system has been in operation since 2008.

A backflow prevention assembly is used to protect potable water supplies from contamination or pollution due to backflow.

In water supply systems, water is normally maintained at a significant pressure to enable water to flow from the tap, shower etc. When pressure fails or is reduced, as may happen if a water main bursts, pipes freeze or there is unexpectedly high demand on the water system, then such reduced pressure in the pipe may allow contaminated water from the ground, from storage or from other sources to be drawn up into the system.

As with everything that is manufactured, Backflow Prevention Assemblies and Devices break or wear out. By having your Backflow Prevention Assembly tested annually, you will help to ensure that the potable water supply remains safe.

We are Certified Backflow Assembly Testers

Certified Backflow Assembly Testers in BC attend a rigorous training course, and are certified by the American Waterworks Association, British Columbia Section. Many of the Backflow Prevention Assemblies have been tested and approved by the University of Southern California , Foundation for Cross Connection Control and Hydraulic Research. Certified Testers can test all Backflow Prevention Assemblies.

Backflow Valve

Click here to learn more about Backflow testing.
Why Choose Us
  • John Mason is BCWWA Certified
  • Experienced
  • Honest
  • Reliable
  • Available 24/7
  • Competitive Rates
  • Servicing Southern Vancouver Island
  • Commercial & Residential



Island Backflow Testing 
John Mason 
Email: backflowguy@shaw.ca