Is a backwater valve required in London, Ontario?

New homes and major renovations in London are generally required to include backwater valves. Older homes are not retroactively required to install one, but they are strongly recommended, especially for homes in flood-prone areas or on combined sewer systems.

How do I know if my home already has a backwater valve?

Look for a rectangular lid flush in your basement floor, typically located near the front of the house or near the floor drain. If unsure, a licensed plumber can confirm this during an inspection.

Can I install a backwater valve myself?

No. Backwater valve installation requires cutting into your main sewer line and must comply with Ontario Building Code requirements. It must be performed by a licensed plumber or drainage contractor. DIY installation may disqualify you from the City of London grant program.

Does a backwater valve require maintenance?

Yes. Debris, grease, or mineral buildup can affect performance. Annual inspection by a licensed professional is recommended, and many manufacturers suggest checking the valve every six months.

Will homeowner's insurance cover sewer backup damage?

Standard homeowner's insurance policies in Ontario typically do not cover sewer backup unless you add a sewer backup endorsement. Installing a backwater valve may help you qualify for coverage and reduce premiums.

What if I'm not sure whether I qualify for the City grant?

Contact the City of London's Sewer Engineering team at sewers@london.ca or 519-661-2489 ext. 5489 to confirm your eligibility before starting any work.

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