Source:  The Wall Street Journal

Date Published: 10.22.2025

Link: It’s Getting Harder to Figure Out Whether You Live in a Flood Zone or Not

Federal flood maps, long used by banks, builders, and homeowners to gauge flood risk, are failing to capture millions of vulnerable properties across the United States. Many inland and urban neighborhoods, where rainfall now causes the most frequent and damaging floods, remain outside FEMA’s designated zones. While FEMA’s maps rely on historical data, private firm First Street uses forward-looking projections, identifying about 13 million additional properties with the same level of annual flood risk as those officially mapped. Cities like Chicago, Houston, and Philadelphia illustrate the gap: residents face repeated basement flooding and sewage backups despite being listed in “no-flood” areas. Updating FEMA maps can take up to six years due to limited funding, political resistance, and bureaucratic delays, leaving the National Flood Insurance Program dependent on outdated information. The result is costly for both homeowners and taxpayers, as FEMA spends billions each year on disaster aid for areas not recognized as high risk. As climate change intensifies rainfall and inland flooding, the mismatch between official maps and actual exposure underscores the urgent need for modern, data-driven mapping to guide resilience planning and equitable insurance coverage.