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Sump pumps & backwater valves

The two main ways to protect a basement in a heavy storm: pump groundwater out, and stop the sewer backing up in.

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Sump pumps & backwater valvesSigns you need it

Is this your problem?

They solve two different problems. A sump pump collects groundwater in a pit under the floor and pumps it outside. A backwater valve sits on your main sewer line and closes if the city sewer backs up, so sewage can’t flow back into your basement.

  • No sump pump, or one that’s old, noisy or runs nonstop
  • Your floor drain or toilet has backed up before
  • Water in the basement during heavy storms
  • No battery backup if the power goes out

Rebates may be available. Some GTA cities offer subsidies for sump pumps and backwater valves, such as the City of Toronto’s Basement Flooding Protection Subsidy Program. Check your city’s rules before work starts, because some programs need you to apply first.

How the job is done4 steps

  1. Assess the house

    Where the water comes in and how the sewer line runs decide what’s needed.

  2. Cut the floor

    The concrete is opened for the sump pit or at the main sewer line.

  3. Install

    The pit, liner and pump go in with a discharge line outside, or the valve is fitted with an access cover.

  4. Patch and test

    The floor is patched and everything is tested before the job is done.

Project photosSee the full gallery
Before: water across a utility room floor
Before: water across a utility room floor
Old main and backup pumps, both worn out
Old main and backup pumps, both worn out
After: new pump, check valve and battery backup
After: new pump, check valve and battery backup
Camera inspection of the sewer line
Camera inspection of the sewer line
New backwater valve on the main sewer line
New backwater valve on the main sewer line
Floor patched with an access cover
Floor patched with an access cover
QuestionsSump pumps & backwater valves
Do I need both?

It depends on the house. A sump pump handles groundwater. A backwater valve handles sewer backups. Many homes that have flooded in a storm benefit from both.

Should I get a battery backup?

Storms that flood basements often knock out power too. A battery backup keeps the pump running when that happens.

Does a backwater valve need a permit?

Often, yes. Plumbing permits are usually required for work on the sewer line. Check with your city.

Does a backwater valve need maintenance?

Yes. It should be checked and cleaned regularly through its access cover so it closes when it needs to.

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Get your sump pumps & backwater valves quote.

Send the form, or call or text a photo to 416-995-6504. We'll go over it with you and book a time for a waterproofing pro to take a look.

Calls answered 8 AM – 8 PM, Monday to Sunday. Forms sent after 8 PM get a call the next morning.

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