Counties with the Highest Natural Hazard Risk in California
The top 25 of 58 California counties on GIS Map, ranked by FEMA National Risk Index score (0-100, national percentile).
| # | County | Risk Index score |
|---|---|---|
| 1 | Los Angeles County | 100.0 |
| 2 | Riverside County | 99.9 |
| 3 | Alameda County | 99.8 |
| 4 | Orange County | 99.8 |
| 5 | San Bernardino County | 99.8 |
| 6 | San Diego County | 99.7 |
| 7 | Santa Clara County | 99.7 |
| 8 | Contra Costa County | 99.5 |
| 9 | San Francisco County | 99.5 |
| 10 | Ventura County | 99.4 |
| 11 | Fresno County | 99.3 |
| 12 | San Mateo County | 99.2 |
| 13 | Sonoma County | 99.1 |
| 14 | Santa Barbara County | 99.0 |
| 15 | Kern County | 98.9 |
| 16 | Monterey County | 98.7 |
| 17 | San Joaquin County | 98.6 |
| 18 | Sacramento County | 98.1 |
| 19 | Santa Cruz County | 97.8 |
| 20 | Solano County | 97.0 |
| 21 | Tulare County | 97.0 |
| 22 | Merced County | 96.9 |
| 23 | Stanislaus County | 96.9 |
| 24 | Humboldt County | 96.8 |
| 25 | Imperial County | 96.5 |
Source: FEMA National Risk Index (December 2025). All counties with data are ranked. Estimates carry margins of error.
Citing this page: GIS Map, “Counties with the Highest Natural Hazard Risk in California”, https://gismap.land/rankings/california/highest-risk-counties. Figures from FEMA National Risk Index (December 2025).
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