What Is a Backwater Valve?
A backwater valve is installed in your main sewer line. It allows sewage to flow out normally but automatically closes if sewage tries to flow back in during heavy rainfall. Without one, sewage can back up into your basement through floor drains, toilets, and sinks.
City of Toronto Basement Flooding Subsidy
The City of Toronto's Basement Flooding Protection Subsidy Program covers up to $3,400:
- Backwater valve: up to $1,750
- Sump pump: up to $1,750
- Combined maximum: $3,400 (or 80% of eligible costs)
📋 Dr. Plumbing handles the entire application process — install, document, submit. Call (416) 417-3007 to get started.
Backwater Valve vs Sump Pump
A backwater valve prevents sewage entering from the city sewer. A sump pump removes groundwater entering through the foundation. They protect against different flooding sources — the City rebate covers both, so we recommend installing both if your basement is at risk.
Frequently Asked Questions
Before rebate: $1,500–$2,500. With the City subsidy covering up to $1,750, your out-of-pocket cost can be $0–$750 in many cases.
Typically 4–6 hours. We cut into the basement floor to access the main sewer pipe and restore the floor after installation.
Yes — annual cleaning and inspection to ensure the flap moves freely. We offer annual maintenance visits.
Yes, though it requires cutting through the finished floor. We minimize disruption and restore the area completely.