New Orleans, LA

New Orleans' flood score is 99—the 99th national percentile, the absolute ceiling in this dataset—and its NRI overall score of 93, with an expected annual loss component of 96, places it among the most comprehensively exposed urban markets in the United States. Hurricane Katrina in 2005 is the operational benchmark: levee failures drove the catastrophic inundation that displaced hundreds of thousands and rendered entire neighborhoods uninhabitable for years. Hurricane Ida arrived as a Category 4 at landfall in 2021, produced widespread outages lasting weeks, and renewed active debates about grid resilience and structural hardening that have not been resolved. We checked twice: elevation in New Orleans does not map neatly to neighborhood prestige. Lakeview was rebuilt after Katrina, but the flood concerns that Katrina exposed have not been engineered away—they have been managed more carefully. Uptown's historic stock and elevation differences matter more to underwriting than the neighborhood's desirability does. Elevation certificates and claims history are the two documents that move premiums most sharply in this market. Annual premiums range from $4,200 to $9,800—the highest range in this dataset outside Key West and Naples. Storm hardening does not fully offset flood-system dependence: the city's water management infrastructure is the first line of defense, and its performance under stress is the real risk variable that buyers are underwriting when they sign. Heat at the 89th national percentile adds compounding operating pressure year-round. New Orleans requires a flood-first, elevation-first analysis—because water management here is not a side issue. It is the entire housing cost story, expressed through insurance, resilience investments, and the carrying costs of living at or below sea level.

— Open Data Collective