Cross Connection FAQ

Frequently Asked Questions

What is a cross connection?
A cross connection is any actual or potential connection between a potable (drinking) water system and a source of pollution or contamination.

What is backflow?
Backflow occurs when water flows in reverse of the normal direction. Rather than flowing into a premise, the water flows back into the water supply putting our drinking water at risk and creating serious health hazards.

What causes backflow?
There are two reasons backflow can happen: back siphonage and backpressure. Back siphonage is caused by negative pressure when regular water flow stops (ex. water main break, high water velocity, line repairs, etc.) Backpressure occurs when water of a different pressure is introduced to the system (ex. temperature increases, booster pumps, elevation etc.)

What is a backflow prevention device?
It’s a mechanism that prevents water from flowing backward into the potable water supply. They require annual testing to make sure they’re working as required.

Why do backflow prevention devices need to be tested?
Devices have internal seals, springs and moving parts that can wear over time. Regular testing by a qualified professional ensures they are functioning properly.

How do I test my device?
Your device must be tested by a qualified professional. The City of Leduc maintains a listing of certified cross connection control testers.

Who do I contact if I would like more information?
If you have questions or concerns, please contact or 780-980-7177.