Flood Risk by County in California
California: 58 counties covered
Across 58 California counties with a FEMA flood score, the average national percentile is 85.8, but that average hides real spread between counties, which is why each one gets its own page rather than a single statewide number.
- Los Angeles County, 100th percentile, Very High
- San Diego County, 99.7th percentile, Very High
- Orange County, 99.8th percentile, Very High
- Riverside County, 99.9th percentile, Very High
- San Bernardino County, 99.8th percentile, Very High
- Santa Clara County, 99.8th percentile, Very High
- Alameda County, 99.7th percentile, Very High
- Sacramento County, 99th percentile, Relatively High
- Contra Costa County, 99.5th percentile, Very High
- Fresno County, 98.7th percentile, Relatively High
- Kern County, 98.5th percentile, Relatively High
- Ventura County, 99.3th percentile, Very High
- San Francisco County, 98.6th percentile, Relatively High
- San Joaquin County, 97.7th percentile, Relatively High
- San Mateo County, 98.4th percentile, Relatively High
- Stanislaus County, 96th percentile, Relatively High
- Sonoma County, 99.2th percentile, Relatively High
- Tulare County, 98.1th percentile, Relatively High
- Solano County, 97.4th percentile, Relatively High
- Santa Barbara County, 98.6th percentile, Relatively High
- Monterey County, 97.3th percentile, Relatively High
- Placer County, 95.8th percentile, Relatively High
- Merced County, 94.7th percentile, Relatively High
- San Luis Obispo County, 96.7th percentile, Relatively High
- Santa Cruz County, 96.2th percentile, Relatively High
- Marin County, 97.2th percentile, Very High
- Yolo County, 89.6th percentile, Relatively Moderate
- Butte County, 93.2th percentile, Relatively Moderate
- El Dorado County, 91.7th percentile, Relatively Moderate
- Imperial County, 94.1th percentile, Relatively High
- Shasta County, 94.8th percentile, Relatively High
- Madera County, 94th percentile, Relatively High
- Kings County, 87.7th percentile, Relatively Moderate
- Napa County, 95.8th percentile, Relatively High
- Humboldt County, 94.2th percentile, Relatively High
- Nevada County, 89.9th percentile, Relatively Moderate
- Sutter County, 71.4th percentile, Relatively Low
- Mendocino County, 95.1th percentile, Relatively High
- Yuba County, 83.8th percentile, Relatively Moderate
- San Benito County, 69.4th percentile, Relatively Low
- Lake County, 94.1th percentile, Relatively High
- Tehama County, 90th percentile, Relatively Moderate
- Tuolumne County, 81th percentile, Relatively Moderate
- Calaveras County, 77.6th percentile, Relatively Moderate
- Siskiyou County, 90.9th percentile, Relatively Moderate
- Amador County, 70th percentile, Relatively Low
- Lassen County, 74.4th percentile, Relatively Moderate
- Glenn County, 42.3th percentile, Relatively Low
- Del Norte County, 77.8th percentile, Relatively Moderate
- Colusa County, 37.9th percentile, Relatively Low
- Plumas County, 87.9th percentile, Relatively Moderate
- Inyo County, 61.6th percentile, Relatively Low
- Mariposa County, 70.8th percentile, Relatively Low
- Trinity County, 79th percentile, Relatively Moderate
- Mono County, 46.9th percentile, Relatively Low
- Modoc County, 44.8th percentile, Relatively Low
- Sierra County, 37.7th percentile, Relatively Low
- Alpine County, 11.2th percentile, Very Low