Flood Insurance: Congressional Action Could Help Increase Coverage for At-Risk Properties

What GAO Found Most U.S. property owners are unprotected from flood risk. As of April 2026, 86 percent of high-risk properties did not have National Flood Insurance Program (NFIP) coverage. The number of NFIP policies declined from 5.5 million in 2010 to 4.5 million in 2026. Growth in the private market offset this decline, and private policies accounted for 14 percent of all policies in 2025. Federal law requires property owners with federally backed mortgages to purchase flood insurance if their property is in a special flood hazard area (SFHA) designated by the Federal Emergency Management Agency (FEMA). This mandatory purchase requirement is the primary reason consumers purchase flood insurance: an estimated 43 percent of properties in SFHAs had flood insurance, compared with 2 percent outside those areas. However, the requirement does not effectively ensure coverage for many at-risk properties. In particular, the FEMA maps used to determine the requirement do not capture all flood risks, especially heavy rainfall. GAO’s analysis of First Street data indicates that about 13 million high-risk properties are outside FEMA SFHAs. The Mandatory Purchase Requirement Does Not Reach...