Flood disasters in the United States

How common are Flood disasters in the U.S.?

Declarations cluster heavily in a small set of states. The three states with the most flood declarations on record are TX (44 declarations), CA (41 declarations), WA (35 declarations), a reflection of underlying hazard climatology, dense exposed population, and decades of development in vulnerable zones. States with the fewest declarations, including FM (1), MH (1), MP (1), though even a low count there can mean a single catastrophic event crossed the federal threshold.

The declaration timeline is dominated by a handful of catastrophic years. The peak year on record was 1972, with 37 flood declarations issued that single year, a clustering driven by major multi-state events and the federal government's declaration cadence. The most recent year on record is 2026, with 10 declarations. Trends over the 73+ year history reflect multi-decadal hazard cycles, warming-related shifts in event severity, and an expanding, more disaster-prone built environment.

FEMA has issued 922 federal disaster declarations classified as flood between 1953 and 2026, affecting 55 states and territories. Each declaration represents a formal federal recognition that an event exceeded state and local response capacity, unlocking Public Assistance, Individual Assistance, or Hazard Mitigation Grant Program funding depending on the declaration class (DR, EM, or FM). Raw declaration counts therefore measure the federal response footprint, which is a lagging and thresholded indicator: smaller events handled entirely at the state level never appear, and declaration thresholds have been recalibrated over the dataset's multi-decade history.