Currently, there are nearly 4.3 million residential properties around the country with a substantial risk of financial loss due to flooding. The report defines “substantial risk” as carrying a 1{de3fc13d4eb210e6ea91a63b91641ad51ecf4a1f1306988bf846a537e7024eeb} chance of flooding in any year.

Some, but not all, of those homeowners have insurance through the federal government’s National
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