What Is Backflow and Why Does It Matter?
Backflow happens when water flows in the opposite direction of its intended path, potentially pulling contaminants such as chemicals, fertilizers, or bacteria into your clean water lines.
In commercial settings, this can pose serious health risks to employees, customers, and even Calgary’s municipal water system.
To prevent contamination, the City of Calgary requires many commercial properties to install and maintain backflow prevention devices. These valves act as a barrier between potable and non-potable water—but they only work effectively if tested and maintained regularly.
Why Backflow Prevention Testing Is Critical for Calgary Businesses
1. Regulatory Compliance
The City of Calgary Water Utility Bylaw 40M2006 requires annual testing of all testable backflow prevention devices by certified City-approved testers. Non-compliance can result in:
- Fines or enforcement actions
- Temporary water shut-offs
- Liability if contamination occurs
You can learn more on the City’s official Cross-Connection Control Program page.
2. Protects Public Health and Safety
Backflow events can pull harmful contaminants into Calgary’s drinking water. Annual testing ensures your business is helping protect employees, customers, and the greater community from potential exposure.
3. Prevents Costly Downtime
A failed or untested device can cause emergency service interruptions or unplanned repairs. Routine testing helps prevent sudden shutdowns and keeps your plumbing system operating smoothly year-round.
4. Protects Your Reputation
Your clients and tenants expect clean, safe water. Maintaining compliance shows that your business values health, safety, and professionalism—important for any Calgary facility manager or property owner.
Which Calgary Businesses Need Backflow Testing?
Backflow prevention testing is required for a wide range of commercial and institutional properties, including:
- Restaurants and cafés
- Industrial facilities
- Medical and dental clinics
- Office buildings
- Multi-unit residential complexes
- Retail and mixed-use spaces
If your property has cross-connections between potable water and potential contaminants (such as irrigation, boilers, or chemical systems), you’re legally required to install and test backflow devices annually.
For details, see Calgary’s Cross-Connection Control Program requirements.
What to Expect During a Backflow Test
When you schedule your test, a City-approved backflow tester will:
- Inspect the device for proper installation and accessibility
- Measure pressure levels to confirm the valve is functioning correctly
- Check for leaks or wear and identify any failures
- Submit an official test report to the City of Calgary on your behalf
At Harris Control Service, we handle everything—including reminders for your next annual test—so your business remains fully compliant.
Stay Compliant and Protect Your Business
Backflow prevention testing isn’t just another task on your maintenance checklist—it’s a legal requirement and an essential part of protecting public health.
By staying on top of annual testing, Calgary businesses can:
- Avoid costly penalties and water interruptions
- Protect customers and staff
- Demonstrate professionalism and regulatory responsibility
Schedule Your Annual Backflow Test Today
Harris Control Service is a City-approved backflow testing provider serving Calgary, Airdrie, Okotoks, High River, Bragg Creek, and Strathmore. Our certified technicians ensure your system is safe, compliant, and documented correctly.
Contact our team today to book your annual backflow test and protect your business with confidence.
Helpful Resources
- City of Calgary – Cross-Connection Control Program
- Water Utility Bylaw 40M2006 (PDF)
- CSA B64.10/B64.10.1 – Selection, Installation, Maintenance, and Field Testing of Backflow Preventers
Suggested Internal Links
- “Air balancing” → your Air Balancing article
- “Preventative HVAC maintenance” → your Maintenance Program page