Backflow Testing Calgary 2026: Annual Requirements, Cost and What to Expect

Every irrigation system connected to Calgary’s drinking water supply is required by the Calgary Waterworks Bylaw to have a backflow preventer — and that device must be tested annually by a City-certified cross-connection control technician. Results must be submitted to the City within 60 days. This is not optional. J.G. Irrigation performs City-certified annual backflow testing during every spring startup visit.

Book your annual backflow test with your spring startup. Call J.G. Irrigation at 587-433-4795.

What Is a Backflow Preventer on an Irrigation System?

A backflow preventer (double check valve, or DCV) is a plumbing device installed at the connection between the irrigation system and the municipal water supply. Its function: prevent water that has entered the irrigation system from flowing backward into the municipal drinking water supply. Without a backflow preventer, a drop in municipal water pressure could siphon irrigation water — which may contain fertilizer, pesticide, or soil bacteria — back into the drinking water supply.

Calgary Waterworks Bylaw 37M2006 requires a properly functioning, City-approved backflow preventer on every irrigation system connected to the Calgary municipal supply.

Calgary Backflow Testing Requirements

Three requirements apply to Calgary irrigation backflow preventers:

• Annual testing: Every backflow preventer must be tested once per calendar year by a technician certified by the City of Calgary’s Cross-Connection Control program.
• Reporting: Test results must be submitted to the City of Calgary Water Resources within 60 days of the test date, using the City’s approved reporting form.
• Approved tester: Testing must be performed by a technician holding current City of Calgary cross-connection control certification. J.G. Irrigation technicians are City-certified and submit results directly to the City on your behalf.

Non-compliance can result in the City of Calgary suspending water service to the property.

Calgary Backflow Testing Cost

What Happens During a Backflow Test?

A City-certified technician connects differential pressure gauges to the test ports on the backflow preventer. The test measures whether the check valves inside the device close and hold pressure correctly in both directions. Results are recorded on the City-approved test form. Pass/fail is determined by the pressure differential measurements against City standards. J.G. Irrigation submits the signed test report to the City within 24 hours of the test.

A failed test means the device needs repair or replacement before the irrigation system can be legally operated. J.G. Irrigation carries common backflow preventer repair parts on every vehicle for same-visit repairs on most Calgary systems.

When Is Calgary Backflow Testing Done?

Backflow testing is performed during spring startup — after the irrigation system is pressurized and before the first watering cycle. This is the most efficient and cost-effective time: the technician is already on-site, the system is pressurized, and the test takes 15-20 minutes on a functioning device.

Annual plan customers with J.G. Irrigation receive their backflow test automatically as part of every spring startup visit at no separate charge.

What Happens If You Skip Backflow Testing in Calgary?

The City of Calgary Water Resources tracks registered backflow preventers and testing compliance. Properties that miss annual testing receive City notices. Continued non-compliance can result in water service restriction or suspension. Beyond the regulatory issue, an untested backflow preventer may have failed check valves that provide no actual protection — defeating the purpose of the device entirely.

Backflow Testing FAQ Calgary

How much does backflow testing cost in Calgary?

Standalone annual backflow testing by a City-certified technician costs $95-$130 for a standard residential double check valve. J.G. Irrigation includes the annual backflow test in every spring startup plan — no separate charge for plan customers. Call 587-433-4795 to confirm current pricing for your property.

Who can perform backflow testing in Calgary?

Only a technician certified by the City of Calgary’s Cross-Connection Control program is authorized to perform backflow testing and submit results to the City. This is separate from a general plumbing license. J.G. Irrigation technicians hold current City of Calgary cross-connection control certification.

What happens if my backflow preventer fails the test?

A failed test means one or both check valves in the device are not closing properly. J.G. Irrigation technicians carry common repair parts for Hunter, Watts, Febco, and Wilkins backflow preventers on every vehicle. Many failed tests result in a same-visit repair ($120-$220) rather than a full replacement. If the device is severely damaged or too old to repair, replacement is quoted on the spot: $280-$450 installed.

Does J.G. Irrigation report the backflow test results to the City?

Yes. J.G. Irrigation submits signed test results to the City of Calgary Water Resources within 24 hours of every test on behalf of the property owner. You receive a copy of the test report for your records.

Book Your Calgary Backflow Test

Call J.G. Irrigation at 587-433-4795 to book your annual backflow test. Most customers book the test as part of the annual spring startup service — the test is performed on the same visit at no separate charge under J.G. Irrigation annual plans. Standalone testing available when required.