Risks of a Cross Connection

A cross connection is any actual or potential connection between a drinking water system and any source of contaminated water. Backflow assemblies reduce the risk of contamination, but if a device fails your clean water can become contaminated, putting everyone’s health at risk if not immediately resolved.

We must all do our part to keep our drinking water safe from the hazards within residential buildings as well as industrial, commercial, institutional and agricultural facilities. Taking steps to avoid cross connections will ensure that our water remains safe and clean.

Why is Testing Required?

Backflow assemblies are mechanical devices that assist to prevent backflow in cross connections. These devices are subject to failure from wear and tear, corrosion, freezing, water conditions and misuse. Typically, each assembly is designed to be used for a specific process hazard level application:

  • Low (minor)
  • Medium (moderate)
  • High (severe)

Annual testing ensures that assemblies are operating as designed to prevent backflow of contaminated water into the drinking water system.

Local Testing Companies

The following local companies employ certified backflow prevention assembly testers. This information is provided only as a service to assist the public and does not represent any endorsement or implied approval by the CRD. Companies other than those listed may be used to perform testing if they employ certified testers.

The property owner or contact person should ensure that anyone contracted to perform testing has current certification and that their test gauge is currently calibrated to meet the requirements of the CRD and Bylaw No. 3516.

Bylaw No. 3516

Know your responsibilities as a water supplier or municipality. Read the Cross Connection Control Bylaw No. 3516 found in Water Bylaws.


Cross connection control workshops and community seminars are arranged periodically by CRD staff. Read more >>

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