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
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
Double Check Valve Assembly (DCVA)