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.
The City of Toronto Basement Flooding Subsidy
The City of Toronto's Basement Flooding Protection Subsidy Program covers up to $3,400 for the installation of backwater valves and sump pumps.
- 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 rebate application. We install, provide documentation, and submit the paperwork on your behalf. Call (416) 880-1374 to get started.
Backwater Valve vs Sump Pump
A backwater valve prevents sewage from entering from the city sewer line. A sump pump removes groundwater that enters through the foundation. They protect against different sources of flooding — the City rebate covers both, so we recommend installing both if your basement is at risk.
Frequently Asked Questions
Before the City rebate, installation typically costs $1,500–$2,500. With the subsidy covering up to $1,750, your out-of-pocket cost can be $0–$750 in many cases.
The installation typically takes 4–6 hours. We need to cut into the basement floor to access the main sewer pipe.
Yes — we recommend cleaning and inspecting the valve once a year to ensure the flap moves freely and isn't blocked by debris.
Yes, though it requires cutting through the finished floor. We work carefully to minimize disruption and restore the area after installation.