Ten Prairie Storms Caused $1.8 Billion in Insured Damage, With Basement Flooding Leading Claims

What the devices cost, and what they do

For sewer backup, the main protection is a backwater valve. The Government of Canada describes it as a one-way valve on the pipe that carries wastewater from your home to the city sewer. It closes when sewage starts to flow backward. It should be installed by a licensed plumber with the permits your municipality requires, and it should be cleaned at least twice a year. The same guidance puts the average cost of repairing a flooded basement at over $40,000.

A sump pump deals with groundwater. It collects water from the weeping tile around the foundation and pumps it away from the house. A pump without backup power fails in exactly the kind of storm that also knocks out the electricity. The Intact Centre on Climate Adaptation's cost guide gave these ranges in 2019. Treat them as a starting point, since labour and material costs have gone up since then:

• Backwater valve, installed: $1,500 to $5,000
• Sump pump: $350 to $700, with a two- to seven-year life expectancy
• Back-up sump pump and power source: $600 to $2,000

What Prairie cities offer

Subsidies are uneven across the Prairies. Among the big cities, only Edmonton has one on its official flood pages. The EPCOR Backwater Valve Subsidy pays up to $800 toward a professionally installed valve. It targets homes built before 1989, homes that have had sanitary sewer backups, and neighbourhoods that have flooded before. EPCOR has suspended the pre-approval inspection for now. You still need the City's permit sticker and a paid invoice, and money is handed out first-come, first-served with no guarantee. EPCOR's separate RainWise rebate pays up to $2,000 for single-family lot projects, such as disconnecting downspouts, rain gardens and soakaway pits, and the valve subsidy doesn't count toward that cap.

In Saskatoon, knowing when the house was built can point to a hidden risk. The City of Saskatoon says homes built from 1966 to 2004 had weeping tile connected directly to the sanitary sewer. In a heavy storm, that can add to the backup instead of preventing it. Saskatoon owners can ask for a Property Information Disclosure search to see what plumbing was permitted and inspected at their address.

Provincial maps show rivers, not overwhelmed sewers

Each Prairie province publishes flood maps, but the maps answer a different question from the one Edmonton faced this summer. Alberta's Flood Hazard Identification Program sends residents to the online Flood Awareness Map Application at floods.alberta.ca. It shows final and draft flood hazard and inundation maps, which mostly cover floods from high river flows. The province notes that maps are not available for every community and that flood risk exists where no map has been drawn.

Saskatchewan's Water Security Agency maps flooding from rivers and high lake levels to a 1:200-year standard, meaning a flood with a 0.5 per cent chance of happening in any year. It focuses on larger communities and others it considers at higher risk.

Manitoba's viewer states the limitation most plainly. The Manitoba Flood Risk Web Application says it is meant to identify potential river flooding and "may not identify ... flooding due to localized drainage problems, ponding, or inundation from major rain events."

This is the main gap for Prairie homeowners. River maps are useful, and exposure is real. Statistics Canada found that 39.5 per cent of residential properties in the Manitoba urban areas it studied were in high flood hazard areas, based on a model that leaves out dikes and other defences. But no provincial map shows whether your street's sewers overflowed in June. For that, your own basement's history and your neighbours' are the best guide you have.

The Flood Risk Finder is built, but not switched on for the Prairies

A national tool was supposed to close this gap. Public Safety Canada announced on April 27 that technical work on Canada's Flood Risk Finder was complete. It offers an address search that rates flood risk from low to extreme, including rainfall flooding. However, results appear only in provinces and territories that choose to opt in.

A week after launch, no province had publicly opted in, The Canadian Press reported. Manitoba said it would not take part "at this time." Alberta and Saskatchewan did not respond. This research found no later report of a Prairie province opting in. IBC's release today asks governments to give homeowners "clear, accessible information" about their risk, though it doesn't name the Finder. For now, Prairie owners have river maps and their own records.

The losses are pooled nationally

Insurers price risk locally, but they absorb losses nationally. IBC says insured losses from extreme weather in Canada averaged $3.7 billion a year over the past decade. That is up from $1.4 billion a year in the decade before and $883 million a year in the decade before that, about a 320 per cent increase after inflation. 2024 was the costliest year on record, at more than $9.4 billion. A Prairie season of this size adds to the loss record that every Canadian insurer uses to set prices.

Reinsurance, the insurance that insurers buy for themselves, is part of this story, but it is more complicated than "costs go up." According to Guy Carpenter's 2026 outlook for Canada, reported by Insurance Business Canada, the catastrophe reinsurance market got more expensive every year from 2021 through 2025 and is expected to ease in 2026. That relief takes time to reach homeowners, though. The same report estimates Canadian home premiums rose about 7 to 12 per cent on average in 2026, and 15 per cent or more in some high-risk postal codes. It also notes that many moderate events spread across the country keep renewal pressure on, even for owners far from the flooding.

What owners can and can't control

Nobody can tell you what your renewal will cost. Some things are clear, though. Edmonton alone expects about $42 million in uninsurable public-sector losses from this summer's storms, and city staff told councillors they expect the City's own insurance premiums to go up, CBC News reported. There is also no public fallback for households that can't buy coverage. The federal government committed $450 million toward a national flood insurance program with an April 2026 target, but IBC said in July that there is no confirmed timeline.

That leaves the three checks as the part owners can control. Know which water endorsements you carry and what their limits are. Install or maintain the device that matches your home's risk, and use a subsidy if your city offers one. Document the basement so a claim can be proven. None of these steps guarantees a lower premium. They do make it much less likely that a sewer backup turns into an uncovered loss.

For the national trend behind these numbers, see Canada's Decade of Climate Catastrophe: Insured Losses Nearly Tripled to $37 Billion, Reshaping Home Insurance for Every Homeowner.