Statewide Flood Management Planning Program

Every California Community is at Risk for Flooding

In just the last 20 years, all 58 counties have experienced at least one flood event, resulting in loss of life and billions of dollars in damage.

Flooding can affect California at different times and in different ways based on the complexities and diversity of the land, hydrology and climate - from stormwater flooding in urban areas to alluvial fan flooding at the base of hillside; from fast moving flash floods in Southern California to slow rise deep floods in the Central Valley.

Map of Flood Zones

The impacts of a major flood would be devastating to California and to the nation. In addition to tragic loss of life, flooding can have a serious impact on the economy and environmental resources.

When California floods...

  • Vital services and critical infrastructure becomes isolated or closed, including transportation and energy facilities, public buildings, hospitals, police and fire stations, and schools.
  • Jobs are lost or put at risk when businesses are disrupted or closed.
  • Vast areas of agricultural lands become unproductive, impacting national and international food supplies.
  • Water supplies and water quality are impacted, including a portion of the water supply for 60 percent of Californians.
  • Sensitive species and ecosystems are impacted. At least 100 sensitive species are exposed to flood hazards within each California hydrologic region.