The backflow preventer is the most legally required component of a Calgary irrigation system — and the most vulnerable to freeze damage. Calgary Water Bylaw requires a CSA-approved backflow prevention device on all irrigation connections. This guide covers testing requirements, repair costs, and when to replace.
Backflow Preventer Types — Calgary Code Requirements
| Type | Code Required For | Annual Test Required | Cost New Installed |
|---|---|---|---|
| Double Check Valve (DCVA) | Residential irrigation | Yes (City of Calgary) | $180-$350 |
| Reduced Pressure Zone (RPZ) | Commercial, chemical injection | Yes — mandatory | $350-$650 |
| Pressure Vacuum Breaker (PVB) | Some residential setups | Yes | $150-$280 |
Calgary Water requires annual backflow preventer testing by a certified tester. J.G. Irrigation carries backflow testing certification and provides test reports required by the City. Call 587-433-4795 for backflow testing, repair, or replacement.
How much does backflow preventer repair cost in Calgary?
Minor repair (valve seat, test cock): $80-$180. Full replacement: $200-$450 installed. Freeze damage is the most common cause — a missed fall blowout allows water to remain in the backflow body, which cracks when temperatures drop. J.G. Irrigation: 587-433-4795.
Backflow Testing and Repair Calgary — 587-433-4795
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