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Back Water Valves

Backwater valves prevent city sewage and water from traveling back into your property if the sewer line becomes overloaded. A flap attached to a floatation mechanism locks the valve by floating up if the exiting flow reverses.


How can you maintain a back water valve?

All back water valves are not the same, however they should all be carefully inspected at least once a year to make sure they are working properly and keeping you safe from disastrous situations.

Things to check when inspecting backwater valves:

✔ Potential Debris Clogs

✔ Difficult Flap Movement

✔ O-Ring Condition

✔ Float Condition

✔ General Deterioration

Local Laws

According to the City of Toronto bylaws, all homes built within the city’s limits must have a backwater valve installed. However, older Toronto homes are not subject to these bylaws. Nonetheless, homeowners to which these laws don’t apply should still consider the installation of a backwater valve to prevent flooding from sewage backup, and may even be eligible for a credit from the city.


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Rob and his company have handled all of our plumbing - both residential and complex commercial for our growing restaurant business. He has also come out many times on a moments notice and saved the day. We HIGHLY recommend Galaxy Plumbing Inc. to everyone!
— Kristin from Toronto

Time to install a back water valve?

Ready to install a backwater valve or want to know more about how it can prevent sewer backups and flooding? Call us now at 416-464-1740 to schedule a service appointment or request a quote at the click of a button.