Trinity County
California — Natural Disaster Risk Assessment
LowComposite Risk Score
National percentile: 79th
Trinity County faces low composite natural disaster risk (NRI Risk Index score 79.5, 79th national percentile), driven primarily by landslide and wildfire exposure. Expected annual loss across all 18 hazard types is $29M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Landslide | High | 18.46 / yr | $730K |
| Wildfire | High | 0.03 / yr | $13M |
| Earthquake | Low | 0.03 / yr | $2M |
| Riverine Flood | Medium | 0.21 / yr | $13M |
| Volcanic Activity | Very Low | 0.00 / yr | $14 |
| Avalanche | Very Low | 0.01 / yr | $630 |
| Heat Wave | Low | 4.85 / yr | $161K |
| Lightning | Very Low | 9.65 / yr | $27K |
| Winter Weather | Very Low | 24.15 / yr | $4K |
| Hail | Very Low | 0.09 / yr | $9K |
| Tornado | Very Low | 0.03 / yr | $11K |
| Strong Wind | Very Low | 0.01 / yr | $4K |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Cold Wave | Very Low | 0.00 / yr | $0 |
| Drought | Very Low | 58.49 / yr | $0 |
| Hurricane | Very Low | 0.00 / yr | $0 |
| Ice Storm | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
Frequently Asked Questions
What is the overall natural disaster risk for Trinity County?
Trinity County has a composite FEMA National Risk Index score of 79.5 out of 100, placing it in the Low category and the 79th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Trinity County?
The three highest-rated hazards are Landslide (High, $730K EAL), Wildfire (High, $13M EAL), Earthquake (Low, $2M EAL). These account for most of the county's expected annual losses.
How does Trinity County compare to other California counties?
Trinity County ranks #50 of 58 California counties for overall natural disaster risk, with a low rating.
What does Expected Annual Loss (EAL) mean?
EAL is FEMA's estimate of average annual dollar losses from natural hazards, calculated from historical event data and exposure models. Trinity County's $29M EAL is a statistical average, not a guarantee for any specific year or address.