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A growing mismatch between flood risk and insurance coverage could leave American homeowners facing hundreds of billions of dollars in uninsured losses during severe flood events, according to a new analysis from Moody’s.
The report estimates that residential properties across the United States could suffer between $375 billion and more than $1 trillion in uninsured flood-related losses, depending on the scale of the event. Researchers warn that the financial burden created by this protection gap extends beyond homeowners, potentially affecting local governments, public finances, lenders, and broader economic stability.
Moody’s examined flood exposure at the county level under multiple scenarios, ranging from a 1-in-100-year flood event to a far more severe 1-in-500-year occurrence. Under the moderate scenario, potential uninsured residential losses reach approximately $375 billion nationwide despite an estimated protection rate of about 65%. In a more extreme event, uninsured losses could exceed $1 trillion, even with insurance coverage levels rising above 70%.
The analysis highlights a striking geographic concentration of risk. Counties in Florida, Louisiana, South Carolina, and Texas account for a significant share of projected uninsured losses under the 1-in-100-year scenario. However, the report emphasizes that flood exposure is not confined to coastal regions. As flood severity increases, large uninsured losses extend further inland, affecting a wider range of states and communities.
A key concern identified by Moody’s is the limited penetration of flood insurance across much of the country. While the National Flood Insurance Program remains the primary source of coverage for residential properties, enrollment rates remain relatively low, including in many areas considered highly vulnerable to flooding. Private flood insurance has expanded in recent years but still represents a comparatively small portion of the overall market.
The report also challenges the widespread assumption that flood risk is limited to federally designated flood zones. Advanced modeling suggests substantial exposure exists beyond traditional floodplain boundaries, indicating that many properties may face meaningful flood risk despite not being subject to mandatory insurance requirements.
Looking ahead, Moody’s projects that climate-related changes could further increase financial exposure. Under an intermediate-emissions scenario, average uninsured flood losses associated with a 1-in-100-year event could rise by roughly 25% by 2050, reaching about $472 billion. The number of counties facing elevated loss levels is also expected to expand.
The report points to recent disasters as evidence of how rapidly flood risks can evolve. Hurricane Helene’s impact on Asheville, North Carolina, demonstrated how intense rainfall events can generate severe flooding in areas not traditionally associated with catastrophic flood losses.
According to Moody’s, uninsured flood exposure represents an increasingly important credit risk. Communities with large protection gaps may face greater economic disruption following major disasters, placing added pressure on households, local governments, and recovery resources long after floodwaters recede.
Source: Moody’s Corporation.
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