Backflow Systems - Testing, Installation & Repair

Why Must The Backflow System Be Inspected & Tested

Because backflow assembly parts can break down and wear out, municipalities in the lower mainland have created by-laws to help ensure the safety of our drinking water. By having the backflow tested annually, you will help to ensure the drinking water supplied to your home remains safe.


  • Backflow happens when there is an undesirable reversal of flow in a potable (drinking) water distribution system; this occurs because of back-siphonage or backpressure.
  • Backpressure occurs due to a condition that creates pressure in the non-potable piping system greater than the pressure in the potable water system. Example: gravity can cause backpressure, due to the elevation differences.
  • Back-siphonage is a form of backflow due to a negative or sub-atmospheric pressure within a potable water system.

Browse Images Of Underground Backflow Valve Inspection