Toronto · Ontario

City of Toronto basement flooding: the Basement Flooding Protection Subsidy Program, what it pays and what it asks for first

Toronto runs the only programme on this site that publishes an allowance for two backwater valves on one property, and the amounts changed recently enough that a lot of pages describing it are describing a programme that no longer exists.

It also has the oldest sewer problem. approximately 23 per cent of the City’s older areas are served by combined sewers — a single pipe carrying both sewage and stormwater, in places built as much as a century ago.

What is actually under the street

Toronto publishes the numbers.

The City maintains nearly 3,800 kilometres of sanitary sewers and more than 523,000 City-owned sewer service line connections. And approximately 23 per cent of its older areas are on combined sewers.

Why 23 per cent is the number that matters to you

In a combined system a heavy rainfall event and a sewage event are not two things that might happen on the same night. They are one thing. A basement in a combined-sewer neighbourhood has a different risk profile from a basement four kilometres away on separated pipes, and neither homeowner is usually told which they are in.

It also explains why the City’s subsidy programme is shaped the way it is: it pays for devices that keep the reversal out of your house, rather than for anything that would fix the pipe under the road. The City is doing that too, separately, and that programme is further down this page.

The two different things Toronto calls basement flooding

The City splits the causes, and the split matters because it decides whose problem it is before it decides whose policy it is.

Telling them apart at 2am is its own skill — the four kinds of basement flooding goes through how to do it in the dark.

Where the City stops and you start

That is the City’s own wording, and it is the sentence that decides whether a claim against the City is even arguable. A private blocked drainpipe, leaking foundation walls or poor lot drainage on your property are yours — repairs and the damage that followed.

Which is why the 311 call is not a formality

The City asks you to “report basement flooding to the City by contacting 311”. Reporting lets it investigate whether its own infrastructure is at fault, and — the part worth knowing on the night — it creates an inspection record that is used in processing claims.

That record cannot be created retroactively. If the municipal sewer turns out to have been blocked or surcharged, a dated report is the difference between an arguable position and a recollection. It costs nothing and it takes one call, and it is entirely separate from whatever you do with your own insurer — how a Canadian water claim runs covers that side, including the 30-day proof of loss deadline.

When the City of Toronto pays for basement flooding, and when it will not

Before the subsidy, the question most people bring to this page after a flood is whether the City is going to pay for it. The City answers that on its own flood claims page, and the answer is a single word: negligence.

Toronto is governed by its own statute rather than the Municipal Act, and the statute removes the other route. A claim in nuisance — the sewage came out of your pipe into my house, so you are liable — cannot be brought against the City for water or sewage escaping from its sewers.

The 311 call is evidence

That is the practical reason to call even when you are sure the problem is your own lateral: the investigation Toronto Water does is part of how any later claim is judged, and the record exists only if you made the call.

How claims usually end

The City describes its own outcomes plainly and publishes no count. Its advice on the same page is that repairs may be expedited by claiming through your own insurance company — which only helps if the policy carries the sewer backup endorsement.

Two clocks

How Toronto’s rules compare with Ottawa, Hamilton, London and three Prairie cities is on is the city responsible for a sewer backup?

The catch most applications trip on

Toronto’s conditions are among the strictest on this site, and the ones that actually cost people the money are done before the work rather than after.

Three things that have to be true before you start

Your downspouts must be disconnected from the sewer. Not planned to be — already done. In a combined-sewer city this is the whole logic of the programme: every downspout still discharging into the sewer is adding rainwater to the pipe that is about to back up into somebody’s basement.

Any paved front-yard area must comply with the City’s zoning requirements. The same logic. Impermeable front yards send water to the same place.

A building permit is required for a backwater valve. Not optional and not retroactive — you cannot obtain one for work already buried.

Two things checked after you finish

Your contractor must have held a valid City of Toronto business licence at the time of the work. Checked afterwards, against the date on the invoice. A contractor who lets a licence lapse mid-job is a problem discovered at the application stage.

You apply within two years of installation, and you cannot have outstanding taxes or debts to the City.

The order that actually works

1. Disconnect the downspouts and sort out the front yard.
2. Get the plumbing assessment — it is itself funded, and it tells you which devices you need rather than which ones a contractor sells.
3. Pull the building permit.
4. Have the work done by a licensed contractor, and keep the invoice with the date visible.
5. Apply, within two years.

Doing it in any other order is how the money gets left behind. Steps 1 and 3 are the ones with no retroactive remedy.

What the money actually buys

The programme is per device rather than a single pot, which is why the headline maximum is reachable only by doing several things.

The cap that is not in the table

Every line above is capped twice. The dollar figure is one ceiling; the other is that the City pays “up to 80 per cent of the invoiced cost”.

So a backwater valve allowance of $1,600 does not mean $1,600 arrives. It means 80 per cent of what you were invoiced, up to $1,600 — and an invoice below $2,000 therefore lands under the cap rather than at it. Any page that lists Toronto’s device maximums without this is overstating what a homeowner gets back, and an earlier version of this page did exactly that.

The sump pump line, worked through on real invoice amounts with the conditions that apply to it, is on sump pump installation in Toronto; the backwater valve line, with the only valve type the City permits, is on backwater valve installation in Toronto. What happens when the sewer backs up anyway — 311, the cleanout rule, claims — is on sewer backup in Toronto. Which parts of a waterproofing job these lines reach, and which they do not, is on basement waterproofing in Toronto.

The cap that attaches to the house rather than to you

Which matters when you have just bought. A previous owner’s claim can reduce or exhaust the allowance for that type of work, and the buyer inherits the position rather than a fresh one. The City will check a property’s subsidy history on request; the contact is on its own programme page, linked at the foot of this one.

And one thing Toronto will not pay for

This is the sharpest contrast in the whole four-city comparison, and it runs opposite to the headline amounts. Toronto makes downspout disconnection a condition of the subsidy and funds none of it through this programme — the only Toronto money for it is a separate reimbursement of up to $500 for eligible low-income seniors and people with disabilities, under the mandatory downspout disconnection program (see eavestroughs and downspouts). Hamilton pays $75 + HST per downspout towards the same work, and Mississauga pays $125 per downspout to a total of $500. The city with the second-largest cheque is the one that makes you pay for the entry ticket.

The plumbing assessment — the one to spend first

It is funded separately from the devices, and it is the only item on the list that tells you which of the others you need. Buying devices before the assessment is how a house ends up with a sump pump answering a problem that was a sewer reversal.

Backwater valve — and why the allowance covers two

A gate on the lateral that sits open in normal use and swings shut when flow reverses. The allowance covers two devices, which is not generosity: a house with separate storm and sanitary laterals may need one on each, and a single-valve assumption is how that gets under-scoped by $1,600.

Sump pump — a different problem entirely

A sump pump answers groundwater arriving through the weeping tile around the footings. It does nothing about a sewer running backwards up the lateral. These are separate failures with separate devices, and the assessment is what tells you which one you have.

Battery backup — the line item that gives the game away

A sump pump keeps a basement dry by running. The storm big enough to overwhelm a drainage system is frequently the storm that takes the power out, at which point a pump on mains power alone stops at precisely the wrong moment. Toronto funding the backup as its own item is that observation expressed as budget.

Pipe severance and capping

Permanently disconnecting a redundant connection to the sewer, commonly an old foundation drain. The smallest line on the list and the one most often left unclaimed, because it is usually done at the same time as something else and nobody itemises it.

What changed in 2026, and why so many pages are wrong

This programme was rewritten recently enough that a large share of what is written about it online describes something that no longer exists — and the City itself still publishes both sets of numbers, which is where the confusion comes from.

Two dates, and they are not the same date

The City expanded the programme with effect for work completed on or after 12 November 2025. But applications for the expanded amounts only opened on May 1, 2026.

That gap is the source of a specific frustration: homeowners who did qualifying work over the winter of 2025–26 and were told to wait. They were told correctly. The work was eligible; the application window had not opened.

Why the old figures still appear on the City’s own page

Because they are still live for work done under them. The City maintains a separate section headed “Eligible Work (If Completed Before November 12, 2025)” carrying the old backwater valve maximum of $1,250 (maximum one device) and the old sump pump maximum of $1,750 (maximum one device).

So both sets are correct, for different work. A page that copies one set without the completion date attached is not out of date so much as unusable — you cannot tell which of your projects it applies to. Every figure on this site carries the date it belongs to for this reason. How to tell whether a page you are reading is stale.

The headline change in one line

The maximum went from $3,400 to $6,650, which the City described as almost doubling the amount of basement flooding subsidies. The structural change is larger than the headline: the backwater valve allowance went from one device to two.

The other programme with almost the same name

Toronto runs two things called the Basement Flooding Protection something, and conflating them is easy. One pays you. The other is the City spending on its own pipes.

What the capital programme actually is

The Basement Flooding Protection Program is “a multi-year program helping to reduce the risk of flooding by making improvements to the sewer system and overland drainage routes”.

The work it covers is public-side and invisible from a driveway: new sewers, upsizing existing storm sewers, inlet control devices, catch basins in low areas, sealing maintenance hole covers, and underground storage facilities.

How widely distributed the problem is

The clearest available measure is the study count. From 2006 to 2024 the City ran Environmental Assessment studies in 67 different areas of Toronto to determine the cause of basement and road surface flooding.

Sixty-seven areas is not a handful of unlucky streets. It is a city-wide condition, and it is consistent with approximately 23 per cent of the older areas running on combined sewers.

Why the City pays you as well as itself

The prioritisation figure answers this. Capital projects are sequenced into a five-year list presented annually to Council in the budget process, and prioritised against a $68,000 cost-per-benefitting-property threshold.

Read that next to the subsidy. The public-side fix is budgeted in tens of thousands of dollars per benefiting property and arrives on a multi-year schedule; the private-side fix is budgeted at $6,650 and can be done this month. The subsidy is not generosity, it is sequencing — and it is why waiting for the City to reach your street is a strategy with a timeline nobody has given you.

The City’s own statement of the mechanism

Which is worth holding next to the insurance section below, because an overloaded sewer is precisely the event a standard Canadian policy does not answer for.

How Toronto compares with the other 4

Toronto publishes a maximum of $6,650 per property. Of the 3 cities with a page on this site that publish a per-property maximum, that puts it second. The highest of the others is Mississauga at $7,500; the lowest is Hamilton at $2,000.

What the headline hides is that Toronto is the only city here that will pay for two backwater valves on one property. On a house with separate storm and sanitary laterals that is a materially different programme from Mississauga’s larger-sounding one, which makes you choose between a sump pump route and a valve route. It is also one of two — with London — that funds a sump pump battery backup as its own line item.

The same diagram as a table

Municipal flood-protection figures, Ontario cities with a page on this site

City	Figure	What the figure is	Programme
Mississauga	$7,500	Maximum per property	Basement Flooding Prevention Rebate
London	$7,000	Largest single item; no per-property maximum published	Basement Flooding Grant Program
Toronto	$6,650	Maximum per property	Basement Flooding Protection Subsidy Program
Ottawa	$3,000	Largest single item; no per-property maximum published	Residential Protective Plumbing Program
Hamilton	$2,000	Maximum per property	Protective Plumbing Program

Read from each city on September 20, 2026.

What none of this does for you

Every dollar on this page buys a device that reduces the chance of water arriving. None of it pays for the damage if it arrives anyway, and in Canada that is a separate purchase that a standard policy does not include.

How Toronto compares with the rest of the province, including two municipalities without a page here: six Ontario programmes compared.

Which of the water perils you actually had decides whether any of the repair is claimable, and that is a separate question from the subsidy. Twelve situations, and what the policy calls each one.

So the complete answer for a Toronto homeowner is both: the device, part-funded by the City, and the sewer backup endorsement, bought from your insurer. Doing one and not the other is a half-measure in either direction.

And if water is in the building now, the clock is Health Canada’s rather than your insurer’s: mould begins to grow in an area with excessive moisture within 48 hours. Your policy separately “requires you to act to limit any further damage”. What that means in practice is on our duty to mitigate page.

Questions people actually ask

Will the City of Toronto pay for my basement flooding?

Only if you can establish that the damage was caused by the City's negligence, according to the City's flood claims page. The City of Toronto Act, 2006, s. 393 bars claims in nuisance for water or sewage escaping from sewage works. The City says the majority of property damage claims made against it are denied, and that court action must be issued within two years of the loss.

What is the 80 per cent rule on Toronto's subsidy?

Every line of the programme is capped twice: at the dollar maximum for that device and at 80 per cent of the invoiced cost. A $1,600 backwater valve allowance means 80 per cent of your invoice up to $1,600, not a flat $1,600.

Why can I not apply yet for work I already did?

Two different dates govern the expanded programme. Work qualifies if it was completed on or after 12 November 2025, but applications for the expanded amounts only opened on 1 May 2026. Work done over the winter of 2025-26 was eligible before the window to claim it opened.

Does Toronto pay to disconnect my downspouts?

No. The City states that disconnecting downspouts from the eavestrough system is not eligible for a subsidy, while also requiring downspouts to be disconnected from the sewer as a condition of the subsidy. Hamilton and Mississauga both do fund disconnection.

The previous owner claimed a subsidy. Can I still claim?

Possibly not in full. Properties have a lifetime maximum subsidy amount for each type of eligible work, so the cap runs with the house rather than the owner. The City will check a property's subsidy history on request.

How much is Toronto's basement flooding subsidy?

Up to $6,650 per property for work completed on or after 12 November 2025, made up of a home plumbing assessment to $500, backwater valves to $1,600 per device for up to two devices, a sump pump to $2,250, a sump pump battery backup to $300, and pipe severance and capping to $400.

Do I need a permit for a backwater valve in Toronto?

Yes. The City requires a building permit to install a backwater valve, and the subsidy conditions require it.

Why do my downspouts have to be disconnected first?

Because approximately 23 per cent of Toronto's older areas are on combined sewers, where one pipe carries both sewage and stormwater. A downspout discharging into that pipe adds rainwater to the system that is about to surcharge into somebody's basement. The City makes disconnection a condition of the subsidy.

How long do I have to apply after the work is done?

Within two years of installation. Your contractor must also have held a valid City of Toronto business licence at the time of the work, and you cannot have outstanding taxes or debts to the City.

Does the subsidy mean I do not need sewer backup insurance?

No. The devices reduce the chance of a backup; the endorsement pays when one happens anyway. The Insurance Bureau of Canada is clear that basement water damage from a sewer backup is only covered if you bought the optional coverage.

What is the difference between the Toronto subsidy and the Basement Flooding Protection Program?

The subsidy pays you to install devices on your own property. The Basement Flooding Protection Program is the City's capital works: a multi-year programme improving the sewer system and overland drainage routes, on the City's right-of-way and public property only. The City ran Environmental Assessment studies in 67 areas between 2006 and 2024.

Will the City fix the sewers on my street?

Possibly, on a five-year project list. Toronto prioritises basement flooding projects against a $68,000 cost-per-benefitting-property threshold: work under that figure advances to detailed design and construction, and work above it is deferred. A program-wide review of how projects are prioritised and sequenced is scheduled for 2026.

Should I report basement flooding to the City?

The City asks you to report it by contacting 311. Reporting lets the City investigate whether its infrastructure is at fault, and creates an inspection record used in processing claims that cannot be created after the fact.

When is basement flooding my responsibility rather than the City's?

The City's own wording is that if the flooding results from a private blocked drainpipe, leaking foundation walls or poor lot drainage on your property, you are responsible for repairs and any subsequent damage caused by flooding.

Where to read next

• What a sewer backup actually is
• The endorsement the devices do not replace
• What restoration work costs, and whose figures those are
• Mississauga’s programme
• Ottawa’s programme
• Hamilton’s programme
• London’s programme

Sources cited on this page

1. City of Toronto, Basement Flooding Protection Subsidy Program
2. Insurance Bureau of Canada, Flooding and Insurance
3. Insurance Bureau of Canada, Water Damage and Flood Protection
4. Insurance Bureau of Canada, How to file a home insurance claim
5. Health Canada, Guide to addressing moisture and mould indoors
6. IICRC, S500 standard page
7. City of Toronto, The Sewers on the Street
8. City of Toronto, Mandatory Downspout Disconnection Financial Assistance (form 15-0033)
9. City of Toronto, news release, April 28, 2026
10. City of Toronto, Basement Flooding Protection Program
11. City of Hamilton, Protective Plumbing Program, pre-qualified contractor fee table

Every figure above was read from the source it is attributed to on September 20, 2026. How we check this.