Actual Mechanical Ltd

Backflow Prevention

Preventing Backflow

To comply with the Canadian Standards Association (CSA B64.10), the National Plumbing Code of Canada, and City of Edmonton Bylaw #17698 property owners must do the following to prevent backflow:

  • Remove any unnecessary cross connections and isolate your water system from the public’s.
  • Protect cross connections that can’t be eliminated with an approved backflow prevention device or assembly.
  • Ensure that all testable backflow preventers are tested annually by a certified tester, and all non testable devices are visually inspected.

Backflow Prevention Assemblies

The type of device required for premises isolation of a commercial, industrial, or multi-residential property is based on how hazardous it could be to the public drinking water:

Severe degree of hazard

Examples of facilities in this category

  • Automotive repair shops
  • Hospitals
  • Dry cleaning plants
  • Car washes
  • Laboratories
  • Mortuaries
Required assembly
Reduced Pressure principle backflow preventer (RP)

Moderate degree of hazard

Examples of facilities in this category

  • Restaurants
  • Schools
  • Hotels
  • Commercial office spaces
  • Shopping malls
  • Apartment buildings
Required assembly
Double Check Valve Assembly (DCVA)

If you have any questions, we recommend you contact us and we will connect you with a certified backflow tester.