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Flood protection

Sump Pump or Backwater Valve, Which Does Your Home Need?

A backwater valve stops sewer backups and a sump pump removes groundwater. Learn which one your home needs, when you need both and what rebates apply.

Updated 5 minute readBy the Water Wise Solutions team

Illustrative photo of a basement sump pit with a pump, discharge pipe and battery backup unit

Are you trying to decide between a sump pump and a backwater valve? It is one of the most common questions we hear. The short answer is that they solve different problems, and many homes benefit from both.

We install backwater valves and sump pumps across Toronto, Peel and Halton. Here is how to tell which one your home needs.

Two different sources of water

Basement flooding usually comes from one of two places.

Sewer water backs up through the floor drain when the municipal sewer overloads in a heavy storm. This is what a backwater valve stops.

Groundwater builds up in the soil around your foundation after rain or snowmelt and seeps through the floor or walls. This is what a sump pump handles, by collecting water from the weeping tiles and pumping it away.

When you need a backwater valve

If your basement has flooded through the floor drain, or your neighbourhood has a history of sewer backups, a backwater valve is the key protection. It is also a smart step before finishing a basement.

When you need a sump pump

If water comes in at the joint between the wall and floor or seeps up through the slab, a sump pump is usually the answer. It is also needed when weeping tiles are disconnected from the sewer.

When you need both

In many older GTA homes, the weeping tiles drain into the sewer line. If a backwater valve is installed downstream of that connection, foundation water can build up while the valve is closed. Disconnecting the weeping tiles and sending them to a sump pump solves this, and it is why the two are so often installed together.

Rebates for each

In Toronto, the City pays 80% of eligible costs up to $1,600 per backwater valve and $2,250 for a sump pump. In Halton, weeping tile disconnection with a sump pump is covered at 100% up to $6,500, and backwater valves at 50% up to $1,600. Peel Region pays 60% of a backwater valve up to $1,500.

Start with an assessment

An assessment shows where water enters your home and how your drains are connected. Reach out to our team, and we will recommend the protection that fits your home and budget.

FAQ

Common questions

Straight answers to the questions homeowners ask us most. If yours is not here, give us a call.

Can a backwater valve cause flooding?

If your weeping tiles drain into the sewer line downstream of the valve, foundation water can back up while the valve is closed. A sump pump gives that water somewhere to go, which is why the two are often installed together.

Do I need a sump pump if my basement has never flooded?

Not every home needs one. It depends on how your weeping tiles drain and on groundwater around your home. An assessment will tell you.

Are both covered by rebates?

In Toronto, both are subsidized at 80% up to set limits. In Halton, the sump pump is subsidized as part of weeping tile disconnection. Peel Region's rebate covers the backwater valve only.

Get a clear, written quote before any work starts

Tell us what is going on and we will book a visit, inspect the problem and give you an itemized estimate with the rebates that apply.