Natural Hazard Risk in California
The risk score (0–100) combines expected annual loss from 18 natural hazards with social vulnerability and community resilience. Higher = greater relative risk. Scores compare counties across the United States.
See what's happening right now on the live map →| County | Risk score | Rating | Expected annual loss | Population |
|---|---|---|---|---|
| Los Angeles | 100 | Very High | $7.6B | 10,005,712 |
| Riverside | 99.9 | Very High | $2.3B | 2,416,838 |
| San Bernardino | 99.8 | Very High | $2.1B | 2,179,979 |
| Orange | 99.8 | Very High | $1.9B | 3,183,647 |
| Alameda | 99.8 | Very High | $1.9B | 1,678,284 |
| Santa Clara | 99.7 | Very High | $2B | 1,934,625 |
| San Diego | 99.7 | Very High | $1.5B | 3,295,981 |
| San Francisco | 99.5 | Very High | $853.4M | 873,808 |
| Contra Costa | 99.5 | Very High | $970.5M | 1,165,466 |
| Ventura | 99.4 | Relatively High | $762.2M | 843,136 |
| Fresno | 99.3 | Relatively High | $557.3M | 1,007,944 |
| San Mateo | 99.2 | Relatively High | $740M | 763,661 |
| Sonoma | 99.1 | Relatively High | $604.7M | 488,330 |
| Santa Barbara | 99 | Relatively High | $477.3M | 447,998 |
| Kern | 98.9 | Relatively High | $417M | 908,530 |
| Monterey | 98.7 | Relatively High | $402.4M | 438,599 |
| San Joaquin | 98.6 | Relatively High | $421.9M | 778,512 |
| Sacramento | 98.1 | Relatively High | $352.4M | 1,584,652 |
| Santa Cruz | 97.8 | Relatively High | $335.4M | 270,408 |
| Tulare | 97 | Relatively High | $214.1M | 472,585 |
| Solano | 97 | Relatively High | $292.1M | 452,833 |
| Stanislaus | 96.9 | Relatively High | $264.9M | 552,683 |
| Merced | 96.9 | Relatively High | $204.8M | 281,054 |
| Humboldt | 96.8 | Relatively High | $188.6M | 135,972 |
| Imperial | 96.5 | Relatively High | $147.6M | 179,319 |
| Madera | 96.4 | Relatively High | $161.6M | 156,146 |
| Marin | 96.4 | Relatively High | $259.3M | 262,172 |
| San Luis Obispo | 95.9 | Relatively High | $213.9M | 280,370 |
| Napa | 95.3 | Relatively High | $186M | 137,956 |
| Del Norte | 94.4 | Relatively High | $142.4M | 27,709 |
| Mendocino | 94.3 | Relatively High | $116.7M | 91,247 |
| Butte | 93.9 | Relatively Moderate | $127.2M | 211,490 |
| Shasta | 93.4 | Relatively Moderate | $135.5M | 181,918 |
| Placer | 93.1 | Relatively Moderate | $162.6M | 404,590 |
| Lake | 93 | Relatively Moderate | $101M | 68,074 |
| Kings | 92.4 | Relatively Moderate | $96M | 152,259 |
| El Dorado | 91.4 | Relatively Moderate | $124.3M | 190,978 |
| Yolo | 91.4 | Relatively Moderate | $116.2M | 216,393 |
| Nevada | 89.9 | Relatively Moderate | $80.6M | 102,095 |
| Siskiyou | 89 | Relatively Moderate | $57M | 43,940 |
| Tehama | 88.9 | Relatively Moderate | $69M | 65,755 |
| Calaveras | 86.6 | Relatively Moderate | $53.4M | 45,237 |
| Mariposa | 86.4 | Relatively Moderate | $38.1M | 17,060 |
| Plumas | 86.4 | Relatively Moderate | $41.1M | 19,746 |
| San Benito | 85.2 | Relatively Moderate | $80M | 64,102 |
| Tuolumne | 85.2 | Relatively Moderate | $50.6M | 55,536 |
| Sutter | 83.7 | Relatively Moderate | $44.8M | 99,621 |
| Colusa | 81.1 | Relatively Moderate | $40.6M | 21,811 |
| Yuba | 80.9 | Relatively Low | $46.3M | 81,512 |
| Trinity | 79.5 | Relatively Low | $29.1M | 15,882 |
| Inyo | 79.3 | Relatively Low | $28.3M | 18,979 |
| Amador | 79.2 | Relatively Low | $38.8M | 40,427 |
| Glenn | 74.4 | Relatively Low | $40.9M | 28,889 |
| Lassen | 73.1 | Relatively Low | $25.4M | 32,683 |
| Mono | 46.5 | Relatively Low | $16.7M | 13,147 |
| Modoc | 39.7 | Very Low | $9.8M | 8,672 |
| Sierra | 31.5 | Very Low | $8.4M | 3,200 |
| Alpine | 10.6 | Very Low | $4.8M | 1,198 |
🏛️ Federal disaster declarations (last 2 years)
Chemical · Designated areas: Orange (County)
Fire · Designated areas: Riverside (County)
Fire · Designated areas: Ventura (County)
Fire · Designated areas: Calaveras (County)
Fire · Designated areas: Los Angeles (County)
Fire · Designated areas: Los Angeles (County)
Fire · Designated areas: Los Angeles (County)
Fire · Designated areas: Los Angeles (County)
Fire · Designated areas: Los Angeles (County)
Fire · Designated areas: Los Angeles (County)
Fire · Designated areas: Ventura (County)
Fire · Designated areas: Los Angeles (County), San Bernardino (County)
Fire · Designated areas: Riverside (County)
Fire · Designated areas: Lake (County)
Fire · Designated areas: San Bernardino (County)
Major disaster (DR) and emergency (EM) declarations unlock federal assistance for the designated areas. Source: FEMA / OpenFEMA.
Other states
Data: FEMA National Risk Index (updated ~annually). AlertAtlas is not an official warning service — always follow local authorities.