Protect Your Home from Sewer Backup
Sewer backup is one of the most devastating and costly forms of basement flooding. When the municipal sewer system becomes overwhelmed during heavy rain, raw sewage can flow backwards through your drain connections and up into your basement. A backwater valve automatically closes when flow reverses — stopping sewage from ever entering your home.
How a Backwater Valve Works
The valve is installed inline on your sewer drain pipe in the basement floor. Under normal conditions, wastewater flows freely out of your home. If sewage begins flowing backwards, a float or flap inside the valve automatically seals shut — blocking the reverse flow completely. Once flow normalizes, the valve reopens on its own.
💡 Check for Municipal Rebates
Many Ontario municipalities — including Hamilton, Kitchener, Waterloo, and others — offer homeowner rebate programs of $1,000–$4,000 for backwater valve installation. We can help you navigate the application process.
Signs You Need a Backwater Valve
- You've experienced basement flooding during heavy rainstorms
- You live in an area with known sewer backup history
- Your home is in a low-lying area or near a flood plain
- Your home does not currently have a backwater valve installed
- You're finishing your basement and want to protect the investment
Our Installation Process
- Locate the main sewer drain line in the basement floor
- Cut and excavate the concrete to expose the pipe
- Install the appropriate size CSA-approved backwater valve
- Ensure proper access panel for inspection and maintenance
- Restore the concrete floor around the valve
- Provide documentation for municipal rebate applications
Maintenance
Backwater valves require occasional cleaning and inspection to ensure the flap mechanism is free of debris and functioning properly. We recommend annual inspection, particularly before heavy rain season.