More than 5,000 Ottawa homeowners are grappling with basement flooding after at least 118 millimetres of rain hit the city on July 1. Many residents, including 71-year-old Margaret Cooper of Crystal Beach, have discovered that their “enhanced” insurance policies often exclude groundwater flooding, leaving them responsible for significant repair costs despite having what they believed to be comprehensive coverage.
Insurance Coverage Gaps and Exclusions
For many affected residents, the path to recovery is complicated by the specific language of their insurance policies. Anne Marie Thomas, director of consumer and industry relations with the Insurance Bureau of Canada, states that basic home insurance typically only covers water damage originating from internal sources, such as a burst pipe or a leaking appliance. Exterior sources, like heavy rainfall, generally require specific, additional coverage.

Even when homeowners purchase supplemental packages, coverage is often segmented. Overland flood insurance protects against water entering through doors or window wells, while sewer backup insurance handles overflows from municipal systems. However, “groundwater flooding”—where water penetrates a home through foundation cracks due to hydrostatic pressure—is frequently excluded from these policies. Margaret Cooper learned this firsthand when her insurer informed her that her claim was denied because the damage was attributed to groundwater, a finding she disputes after not receiving a formal inspection report.
Did You Know?
The province of Ontario is activating its Disaster Recovery Assistance for Ontarians (DRAO) program, which can provide eligible homeowners, small businesses, farms and non-profits with up to $250,000 to assist with recovery from significant overland flooding.
Financial and Legal Implications for Homeowners
The financial burden of these exclusions is substantial. Alex Berezowski of The Foundation Experts notes that basement repairs for groundwater issues often require exterior excavation to address the source at the foundation, with costs frequently exceeding $20,000. Berezowski reports that his firm has never seen an insurer approve a claim for groundwater flooding since the company began operations in 1995.
Legal experts suggest that the complexity of these policies may create grounds for dispute. Kevin Butler, a senior associate with Tierney Stauffer LLP, warns that when insurers deny claims based on exceptions “buried on the 45th page of the policy,” it may lead to legal liability if the coverage provided does not align with what the consumer reasonably expected to purchase. Ottawa Mayor Mark Sutcliffe has expressed concern regarding these denials and has encouraged local lawyers to assist affected residents.
Expert Insight:
The distinction between types of water damage is a frequent point of contention in insurance law. Because groundwater flooding is often tied to the physical integrity of a home’s foundation, insurers categorize it differently than sudden, accidental events like a sewer backup. This creates a high-stakes environment for homeowners in older neighborhoods, where drainage systems may not keep pace with the increasing frequency and severity of extreme weather events.
Frequently Asked Questions
Why was Margaret Cooper’s insurance claim denied?
Her insurer stated that the damage was caused by groundwater flooding, which is excluded from her policy, and noted that an inspection found water entered through foundation cracks due to hydrostatic pressure.

What is the difference between overland and groundwater flooding?
Overland flooding occurs when water pools on the surface and enters through doors or window wells, while groundwater flooding involves water seeping up through the foundation and floor from the soil below.
Is there government support available for the flood damage?
Yes, the province of Ontario has activated the Disaster Recovery Assistance for Ontarians (DRAO) program for areas that experienced significant overland flooding.
How do you assess the reliability of your current home insurance policy regarding extreme weather events?
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