Backflow Prevention Valve

What is a backflow valve?

A backflow valve is a device installed in a property's sewer line. It allows wastewater to flow out toward the street while preventing it from coming back into the home in case of a sewer system overload.

This safety mechanism is especially useful for preventing sewer backups, particularly during heavy rainfall or exceptional conditions.

Installing a backflow valve can help protect your basement from water damage and save you from costly repairs.

Advice

• If you want it to work properly, occasionally check the valve to ensure it is not blocked.
• When it rains heavily or snow melts quickly, reduce your water consumption to prevent sewer water from entering the drainage system through the valve.

Do you have questions about installing your backflow prevention valve or aren’t sure where it’s located in your home? You should contact a plumber.
You can find a list of professionals on the Corporation des maîtres mécaniciens en tuyauterie du Québec (CMMTQ) website.