Backflow Preventer Test Calgary: City-Required Annual Testing for Irrigation Systems 2026

Backflow Preventer Testing in Calgary: What You Need to Know

Every Calgary irrigation system connected to the municipal water supply is required by the City of Calgary Utility Bylaw to have a backflow preventer installed and tested annually by a certified tester. The backflow preventer protects the city water supply from contamination by preventing irrigation water from flowing back into the drinking water system. Failure to complete the annual backflow test and submit the report to the City of Calgary can result in water service disconnection.

What Is a Backflow Preventer?

A backflow preventer is a mechanical device installed on the irrigation system water connection, typically in the utility room or mechanical room, that allows water to flow only in one direction — from the supply into the irrigation system. It prevents a back-pressure or back-siphonage event from drawing irrigation water (which may contain fertilizer, pesticides, soil bacteria, or other contaminants from the irrigation zone) back into the home water supply or the city water main.

Calgary irrigation systems use either a Pressure Vacuum Breaker (PVB) or a Double Check Valve assembly (DCV). The type installed depends on when the system was installed and the local authority having jurisdiction requirements at the time of installation.

City of Calgary Backflow Testing Requirements

• Annual testing required for all irrigation systems with a cross-connection to the municipal supply
• Testing must be performed by a City of Calgary certified cross-connection control technician
• Test results must be submitted to the City of Calgary Utilities within 30 days of testing
• Failed devices must be repaired or replaced and retested within the City deadline
• Non-compliance can result in water service being discontinued

J&G Irrigation Backflow Testing Service

J&G Irrigation is certified to perform City of Calgary backflow preventer testing and files test results directly with the City on behalf of the property owner. The annual backflow test is included as part of J&G Irrigation spring startup service visits, meaning plan customers receive the test automatically each season.

For properties needing a standalone backflow test outside of spring startup, J&G Irrigation provides testing-only service calls. Written test completion certificates are provided for property records. Call 587-433-4795 to schedule your Calgary backflow preventer test.