Montreal Flood Lawsuits Target City Inaction as 300 Homes Hit and Overland Coverage Gap Widens

The event itself was severe. Environment Canada described June 20 as a series of near-stationary thunderstorms that dropped between 100 and 170 millimetres of rain on southern Quebec, flooding more than 300 homes across Pierrefonds-Roxboro and Dollard-des-Ormeaux, according to Insurance Business. Jeff Orenstein of Consumer Law Group, which filed the actions, argued the municipalities failed to install systems that absorb, detain, and slowly release rainwater — including so-called "sponge parks" designed to blunt exactly this kind of downpour.

For residents, the damage is not abstract. One Dollard-des-Ormeaux homeowner said his house had flooded for the second time since 2024, with the latest repair bill near $100,000, and that he did not know whether his insurer would cover him again or whether he would need to find a new policy altogether. That uncertainty — not just the water — is what turns a weather event into a financial one.

It is also not a one-off. Quebec's 2024 floods, driven by the remnants of tropical storm Debby, were ranked the costliest severe-weather event in the province's history, with insured damage later estimated near $2.5 billion. The West Island flooding sits inside a pattern, not outside it.

Here is the distinction that catches people off guard. A standard home policy is built around sudden, internal water problems — a burst pipe, an overflowing appliance. It is generally not built for water that arrives from outside the home. The Insurance Bureau of Canada is explicit that damage from sewers and drains backing up is typically not covered by a standard policy, and that overland flooding — water pooling on the ground and seeping in — is typically excluded as well. Both are sold as optional endorsements, and both have to be requested.

The two perils are easy to confuse, so it helps to separate them:

The stakes are not small. Public Safety Canada notes that floods are the most common and costly natural hazard in the country, account for roughly half of all home insurance claims, and that the average cost to repair a flooded basement runs over $40,000. A single "moderate" storm can produce a bill most households cannot absorb out of pocket.

For a fuller walkthrough of how these endorsements fit together, see our explainer on what home insurance actually covers for flooding.

Having an endorsement is not the same as being protected. Even when overland coverage exists, a limit set years ago may no longer match today's repair costs. And in high-risk areas with a flood history, the coverage may be capped, saddled with steep deductibles, or declined outright.

That is not an insurer being difficult — it is how risk-based pricing works. The Financial Consumer Agency of Canada confirms that policies usually exclude water damage from a source outside the home, and that insurers set flood premiums by local risk, so in very high-risk areas coverage may be unavailable, more expensive, or subject to higher deductibles and lower limits. It is the reason two neighbours can get very different answers from the same insurer.

At the national scale, the gap is large. The Insurance Bureau of Canada estimates that roughly 1.5 million high-risk Canadian households cannot obtain affordable flood insurance — and the pressure is building. Insured catastrophe losses averaged $37 billion a year over 2016 to 2025, nearly triple the prior decade's $14 billion, with 2024 the first year national losses topped $8 billion.

Part of why the risk still sits squarely on individual owners is that the promised public fix remains unbuilt. Budget 2024 committed the federal government to stand up a low-cost flood insurance program for high-risk properties, including a CMHC subsidiary to deliver flood reinsurance, according to the federal budget. The 2024 Fall Economic Statement reaffirmed the plan — reinsurance plus a separate affordability subsidy — but pushed further detail into the next budget cycle.

For homeowners, the takeaway is simple: until that program is funded and running, the flood-coverage decision is a private-market one. The safety net people assume exists is still, for now, a policy intention rather than a live program. Our coverage of why Ottawa has not committed to launching the program traces where the file has stalled.

None of this is legal advice or a verdict on the lawsuits, and it is not a directive to buy any particular product. It is a prompt to replace assumptions with answers. The most useful thing a homeowner can do this week is make one phone call and ask precise questions rather than the vague "am I covered for floods?"

Worth confirming: whether you carry overland flood coverage and sewer-backup coverage specifically, since one does not imply the other; what the dollar limit and deductible are on each, and whether that limit reflects what it would actually cost to rebuild today; whether your payout is based on replacement value or actual cash value; and whether your address sits in a zone where availability or price could change at renewal. Public Safety Canada notes that "flood insurance" can span several distinct endorsements — overland, sewer backup, sump-pump failure, sometimes storm surge — so the goal is to learn which water pathway is actually insured, not just whether a policy exists.

The litigation will decide who was responsible for the West Island flood. Your coverage decides who pays for the next one at your address. Those are different questions, and only one of them is within your control today.