Toronto nearly doubled its basement flooding subsidy — here's what it covers
As of May 1, 2026, the City pays up to $6,650 per home for backwater valves, sump pumps, and flood-proofing — and it's retroactive to November 2025. Here's how it works, and why the permit matters.
Two summers ago — July 16, 2024 — a storm dropped close to 100 mm of rain on parts of Toronto in a few hours. Basements flooded across the city, and insured losses from that July's flash floods came in around $991 million, one of the costliest weather events in Ontario's history.
The City's answer, as of May 1, 2026: a nearly doubled Basement Flooding Protection Subsidy, now worth up to $6,650 per property — up from about $3,400. If you own a house (or a duplex, triplex, or fourplex), mid-storm-season is exactly the right time to know what it covers.
What the City will pay for
The subsidy covers up to 80% of the invoiced cost for each item, capped per device:
- Backwater valve — up to $1,600 per device, for up to two valves (plus alarms). This is the big one: it closes your sewer line during heavy rain so the City's overloaded sewers can't back up into your basement.
- Sump pump — up to $2,250, plus up to $300 more for a battery backup (pumps fail exactly when the power does).
- Home plumbing assessment — up to $500 for a licensed plumber to identify what's putting your basement at risk. You don't have to act on the recommendations to claim it.
- Weeping tile severance and capping — up to $400 to disconnect your foundation drains from the City sewer.
Already did the work? The expanded amounts apply retroactively to eligible work completed on or after November 12, 2025, and you have two years from installation to apply.
The fine print that trips people up
- Your contractor (and any sub-contractors) must hold a valid City of Toronto business licence at the time of the work — no licence, no subsidy.
- Your downspouts must already be disconnected from the City sewer.
- Subsidies are first-come, first-served, subject to the year's Council-approved funding — another reason not to sit on an application.
- A backwater valve requires a building permit and a City inspection before the valve is covered over.
Why the permit is good news
That last requirement means every properly installed backwater valve leaves a public trail: a plumbing permit on the address's record. If you're buying a house, that's a signal worth looking for — it tells you a previous owner took flood risk seriously (and that the City inspected the work). No permit but a valve in the basement? Ask questions.
Pull any address's permit history to check, or start with the property snapshot for the full record in one view. If you already own, monitor your address and you'll see inspections and new permits as they land.
The bottom line
A backwater valve typically costs a couple thousand dollars installed. At 80% back, the City is offering most Toronto homeowners flood protection for a few hundred dollars out of pocket — against a risk that produced a near-billion-dollar storm two summers ago. Full program details and the application are on the City's subsidy page.