A cross connection is a piping arrangement that allows a potable water system to be connected to a source of potential pollution or contamination. It's very important to protect cross connections in order to prevent backflow into potable water. Ultimately, backflow can cause the contamination of the entire public water supply, posing a risk for anyone using water for drinking, cooking, bathing or any other purposes.
If there's an incident resulting in contamination of public drinking water (due to improper or unprotected plumbing connections), the owner responsible or occupant of the property can be held liable for damages.
In order to comply with the Canadian Standards Association (CSA B64.10), the National Plumbing Code of Canada, and City of Edmonton Bylaw #15816 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 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: