HazardFacts

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Natural hazard risk by county in California

24 county pages so far. Overall ratings from the FEMA National Risk Index v1.20 (December 2025), which compares each county with all US counties.

Open a county for its FEMA ratings for each hazard, flood insurance and claims records, disaster declarations and tornado history.

CountyFEMA overall risk rating
Butte CountyRelatively Moderate
Calaveras CountyRelatively Moderate
Contra Costa CountyVery High
El Dorado CountyRelatively Moderate
Fresno CountyRelatively High
Humboldt CountyRelatively High
Imperial CountyRelatively High
Kern CountyRelatively High
Los Angeles CountyVery High
Marin CountyRelatively High
Mendocino CountyRelatively High
Monterey CountyRelatively High
Napa CountyRelatively High
Orange CountyVery High
Riverside CountyVery High
Sacramento CountyRelatively High
San Bernardino CountyVery High
San Diego CountyVery High
San Mateo CountyRelatively High
Santa Barbara CountyRelatively High
Shasta CountyRelatively Moderate
Sonoma CountyRelatively High
Tuolumne CountyRelatively Moderate
Ventura CountyRelatively High

This product uses the Federal Emergency Management Agency's National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s). This product uses the FEMA OpenFEMA API, but is not endorsed by FEMA.