Toronto’s Basement Flooding Subsidy in 2026: What the City Pays, What It Doesn’t, and How to Get It

It’s 2 a.m. It’s been pouring for three hours. And the floor drain in your basement is doing the one thing it’s never supposed to do.

It’s coming up.

That’s a sewer backup. When heavy rain overloads the City’s sewers, the water has to go somewhere. In a lot of older Toronto homes, “somewhere” is the lowest drain in the house.

Here’s the good news: the City of Toronto will now pay up to $6,650 to help you stop that from happening again.

Here’s the problem: most plumbing websites still quote the old numbers. The cap used to be $3,400. Homeowners plan around the wrong figures, skip steps that matter, and leave money on the table.

This guide uses the City’s current rules, checked against toronto.ca in November 2026. It covers what’s paid, the math, the steps in the right order, and the mistakes that get claims denied.

The short answer

What does the Toronto subsidy pay in 2026?

Every amount is 80% of your invoice, up to a cap. It’s not a flat cheque. That detail matters, so we’ll do the math in a second.

These amounts apply to work completed on or after November 12, 2025. The City started taking applications at the new amounts on May 1, 2026. Labour, materials and taxes all count toward the invoice.

Two more things to know before you book anything:

• Each property has a lifetime maximum for each type of work. If a previous owner already claimed a valve, you may not get that money again. Check your property’s history by emailing BasementFlooding@toronto.ca or calling 416-338-7668.
• Older work got smaller amounts: $1,250 for one valve and $1,750 for a sump pump if it was done before November 12, 2025. That work also had to be claimed within one year, and that window has now closed.

The 80% math in plain numbers

Think of the cap as a finish line. The City pays 80 cents of every dollar until it hits the cap. After that, every extra dollar is yours.

Take a backwater valve. The City’s $1,600 maxes out on a $2,000 invoice.

• Invoice under $2,000? The City pays 80%, and you pay 20%.
• Invoice over $2,000? The City’s share stops at $1,600, and you pay everything above that.

So the real question isn’t “how big is the subsidy?” It’s “what will my invoice be?”

That depends on your house: how deep the main drain sits, what’s covering the floor, whether there’s already a cleanout, and what shape the old pipe is in. A valve under a finished basement with an old clay drain is a very different job from one in a bare concrete floor.

That’s why we give you a flat-rate price before we start. Plug it into the math above and you’ll know exactly what you’ll pay. Here’s how our backwater valve installation works.

Is a backwater valve the right fix for your basement?

Before you spend anything, figure out where the water came in. The right fix depends on it.

• Did water come up through a floor drain, toilet or shower during heavy rain? That’s sewage backing up from the City’s sewer. A backwater valve is built for exactly this.
• Did water seep through a wall, a crack, or the joint where the wall meets the floor? That’s groundwater, and a backwater valve won’t stop it. It’s a waterproofing or weeping tile job, and it’s priced differently. Here’s what leaky basement repair costs in Toronto.
• Does your toilet gurgle or bubble when it rains hard? That’s often an early warning that the sewer line is struggling. Here’s what a bubbling toilet usually means.

How does a backwater valve work?

A backwater valve sits on the main sewer line under your basement floor. Inside is a flap.

On a normal day, the flap hangs open and wastewater flows out to the street. When the City’s sewer backs up, the pressure pushes the flap shut, so the sewage can’t get into your house.

There’s one catch. While the flap is closed, your own water can’t get out either. Don’t run toilets, sinks, the dishwasher or the washing machine until it opens again.

An alarm tells you when the valve has closed. The subsidy covers the alarm too.

Three things that can change the plan

1. Weeping tiles connected to the sewer. If your foundation drains (weeping tiles) join the sewer line, they have to connect on the street side of the valve. If they don’t, the groundwater from around your foundation is trapped on the house side when the flap closes, and it comes up the floor drain anyway. The other option is to cut them off from the sewer and send that water to a sump pump. The subsidy pays toward both: $400 for the disconnection and up to $2,250 for the pump.
2. A second valve. Some houses need two. The program covers up to two, and the City’s assessment form has a line for exactly that question.
3. Ejector pumps. Some basements use a sewage ejector pump instead of a valve. Ejector pumps aren’t covered by this program.

How to get the subsidy, step by step

Order matters here. Some of these steps can’t be fixed after the fact.

1. Check that you qualify. You must be the registered owner of a single-family home, duplex, triplex or fourplex in the City of Toronto. Your downspouts must be disconnected from the sewer, or you need an exemption from the City. Any front-yard parking pad must meet zoning. And you can’t owe the City taxes or other debts.
2. Start with the home plumbing assessment. It’s optional, but the City pays up to $500 of it, and it tells you what your house actually needs. On the City’s form, the plumber checks:
   • whether you have a backwater valve, and how it’s working
   • your sump pump, battery backup and flood alarms
   • your private sewer line, with a camera, for cracks and blockages
   • whether your weeping tiles and downspouts are connected to the sewer
   • floor drains and other places water could get in
   You don’t have to act on the recommendations to get the assessment subsidy.
3. Check the City licence before any work starts. Your contractor, and any sub-contractor who does part of the job, needs a valid City of Toronto business licence. Look them up with the City’s Business Licence Lookup or call 416-392-6700. No licence, no subsidy. Plumbing contractors (T94), plumbing and heating contractors (T92) and drain contractors (T87) can do all four kinds of work. Building renovators (T85) can only do sump pumps and pipe disconnection.
4. Get a building permit for the backwater valve. Ask your contractor up front who is pulling it.
5. Install it, then get the City inspection before the floor is closed. Don’t cover or enclose the valve until the inspection is done. The City may also take photos and video of the valve.
6. For a sump pump, take photos. Photograph the pump and the discharge pipe where it comes out outside. If you’re adding a battery backup, the pump and the battery have to be priced on separate lines of the invoice.
7. Get an invoice the City will accept. It needs:
   • the name and address of every licensed contractor and sub-contractor
   • the property address
   • the date the work was finished
   • an itemized cost for each device or service
   • the total, clearly marked “paid in full”
8. Apply online within two years of the work. Use the City’s online application and attach the original electronic invoices. Payment can take up to 10 weeks. Subsidies are first come, first served, and depend on the City’s yearly funding, so don’t sit on it.

Why subsidy claims get denied

Most of these are paperwork, not plumbing. Check this list before you pay the final invoice.

• The valve was covered before the inspection.
• A sub-contractor didn’t have a City licence.
• The sump pump and battery backup were on one invoice line.
• The invoice wasn’t itemized, or it doesn’t say “paid in full”.
• The downspouts are still connected, or the parking pad doesn’t meet zoning.
• A previous owner already used the lifetime maximum for that type of work.
• More than two years passed between the work and the application.
• An old form was used. Out-of-date PDF application forms still show up in search results. Apply through the online application on toronto.ca.

What the subsidy doesn’t pay for

• Disconnecting your downspouts. It’s required to qualify, but it isn’t subsidized.
• Sewage ejector pumps.
• A third valve or a second sump pump.
• Waterproofing your foundation walls. It isn’t on the City’s list of eligible work. If water is getting in through the walls, that’s a separate job with its own costs.

After the install: keep it working

A backwater valve only protects you if the flap can actually close.

• Clean the backwater valve once a year through its clean-out ports. That’s the City’s own advice. Grease and debris in the valve can stop the flap from sealing.
• Test your alarms, so you know the valve has closed before you run the dishwasher.
• Point the sump pump discharge onto grass, garden or gravel, at least 2 metres from the foundation. Otherwise the water you pump out just soaks back toward the house.
• Check the battery backup as the manufacturer recommends. Storms knock out power exactly when the pump is needed most.

Common questions

Can I apply if I rent?

No. Only the registered owner can apply. If you rent, show this page to your landlord.

Do I have to do what the plumber recommends to get the $500 assessment subsidy?

No. The City pays its share of the assessment either way.

Can I install a backwater valve myself and still get the subsidy?

The rules require the work to be done by a contractor with a valid City of Toronto business licence. The valve also needs a permit and an inspection.

How long does the money take?

Up to 10 weeks, and only if the application is complete. Missing documents mean it won’t be processed.

I put in a valve in 2024. Can I still claim?

Not anymore. Work done before November 12, 2025 had a one-year window, and it has passed.

Does this work in Mississauga or Brampton?

No. This program is only for properties inside the City of Toronto.

Get a price you can plug into the math

Subsidy amounts and rules are from the City of Toronto’s Basement Flooding Protection Subsidy Program page, checked November 2026. The City sets funding every year, so confirm on toronto.ca before you book.