Backwater valve rebate

Normal conditions

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Under normal conditions, the backwater valve (flap) stays in open position. This position lets water flow out of the home and into the main sewer system.

During a sewer backup

The main sewer system can back up due to blockages from tree roots and grease, or an overloaded system caused by extreme rainfall.

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When there’s a sewer backup, sewer water starts flowing back towards the home.

The backwards flow of water from the sewer closes the flap on the valve. This flap works as a physical barrier, closing the home's main sewer line and blocking the back flow of sewer water to protect your home.

Once the water returns to flowing normally, the flap will fall open again. Newer models have the option of an alarm to tell property owners that the backwater valve has been triggered. This can help you monitor when wastewater is flowing properly again.

Using water or running the shower, washing machine, or dishwater when the backwater valve is closed (such as during a major rainfall event) may cause basement flooding, as this water will not be able to flow out of the home to the sewer.
 

Backwater valves can be an effective way to stop wastewater from backing up into your basement, but they’re not suitable for all homes.

Before you install, be sure that a backwater valve installation is the right decision for your property.

Considerations:

• A backwater valve must be installed by a licensed professional.
• Backwater valves do not prevent other forms of flooding such as overland rainfall entering windows, weeping tile, or foundation leaks.
• Some older homes may have foundation drain/weeping tile connection to the sanitary sewer. Be sure to hire a certified plumber to ensure that you invest in the right flood prevention methods for your home.
• In some circumstances a sanitary backwater valve is not enough to prevent basement flooding, and other flood prevention measures might also be necessary.
• Only sanitary backwater devices with “normally open” valves are acceptable, as this specific type of valve lets sewer gases exit the home.
• In keeping with the Ontario Building Code, a backwater valve can only be installed on the sanitary building drain that serves one dwelling unit. A basement apartment will require its own valve.
• There are different types of backwater sanitary valves, requiring different installations. A common variety type is called a full-port backwater valve. This type of valve has a clear surface that lets you see if the valve is working properly.

You’re eligible for the Sanitary Backwater Valve Rebate Program if you have been flooded. Proof of the flooding incident will be required.

If you have not been flooded or do not have proof of the incident, please contact us at 905-791-7800, extension 4409 to confirm your eligibility.

To receive the rebate, you must submit a complete Application Package that includes:

• Confirmation that all of your downspouts have been disconnected or a signed Acknowledgement and Release form.
• Confirmation that a building permit from the City of Brampton, the City of Mississauga, or the Town of Caledon has been acquired and passed inspection once the valve has been installed.

You will also need to provide original copies of invoices or receipts for the full cost of the backwater valve installation.

Invoices and receipts must show:

• The address where the backwater valve was installed. 
• An itemized cost breakdown of all charges (for example, the cost of the valve, installation, and taxes).
• The payment in full indicated by the licensed plumber.
• The total amount paid.

Print and complete application package

The following resources can help you make an informed decision about installing a sanitary backwater valve.

Websites:

• The Institute for Catastrophic Loss Reduction (ICLR) provides detailed information about protecting your home from basement flooding.
• Insurance Bureau of Canada’s Home Flooding Mitigation Techniques: Backwater Valves

Videos:

• Reducing your risk of basement flooding
• Narrated illustrations on basement flooding
• How to maintain a sanitary backwater valve
• How underground plumbing is set up

If you’ve done your research and feel that a backwater valve is right for your home, arrange an in-depth investigation of your plumbing by a licensed plumber.