FAQ

Under the Residential Protective Plumbing program, eligible homes can receive up to $1,000 for an interior backwater valve, $2,500 for an exterior storm backwater valve, $1,500 for a sump pump with battery backup in an existing pit, or $3,000 for a sump pump with battery backup in a new pit, plus the eligible plumbing-work permit fee. Eligibility depends on the home and work, so check the City's current rules.

Check the City’s current eligibility rules and application process before authorizing work. Ask your contractor who will handle the permit, inspection, invoice and supporting documents.

In 2026 an interior backwater valve retrofit typically costs $1,800 to $4,500 before the rebate, depending on how deep the pipe is and what is in the way. Complex jobs can cost more.

Many Canadian insurers ask if a valve is installed before offering sewer backup coverage, or offer a better rate if you do. Ask your broker; ask the professional handling your request for an invoice and photos to send them.

Open the access cover two or three times a year, check that the flap moves freely and clear any debris. Don't run water while the valve is closed during a storm.

In older homes we recommend it. It confirms where the pipe runs, how deep it is, and whether it has roots or damage that should be fixed at the same time.