Reviewed May 24, 2026. Independent local guidance; final grant decisions are made by the City.
What This Grant Path Covers
A backwater valve, often searched as a sewer check valve, is installed on the sanitary sewer line to reduce sewage backup risk. London homeowners may be able to use the Basement Flooding Grant for eligible installation costs if they apply before work starts.
Important cap: Use the backwater valve cost guide to compare quote amounts against the reimbursement cap and likely out-of-pocket cost.
Quote Checklist
Ask for materials and labour to be separated, make sure permit responsibilities are clear, and keep backwater valve work separate from sump pump, weeping tile, or cosmetic restoration items.
Related Pages
Compare the backwater valve vs sump pump guide, review the rules that can void applications, and check eligibility.
Public sources: By-law A.-7562-160 and City sewers and wastewater information.
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Get the guide and optional contractor-match help.
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