Tuolumne County
California — Natural Disaster Risk Assessment
MediumComposite Risk Score
National percentile: 85th
Tuolumne County faces medium composite natural disaster risk (NRI Risk Index score 85.2, 85th national percentile), driven primarily by wildfire and landslide exposure. Expected annual loss across all 18 hazard types is $51M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Wildfire | High | 0.01 / yr | $27M |
| Landslide | Medium | 4.42 / yr | $59K |
| Heat Wave | Medium | 3.35 / yr | $3M |
| Riverine Flood | Medium | 0.96 / yr | $19M |
| Drought | Medium | 90.68 / yr | $595K |
| Lightning | Medium | 20.27 / yr | $501K |
| Earthquake | Low | 0.02 / yr | $769K |
| Winter Weather | Medium | 33.02 / yr | $95K |
| Volcanic Activity | Very Low | 0.00 / yr | $39 |
| Avalanche | Very Low | 0.03 / yr | $1K |
| Strong Wind | Very Low | 0.05 / yr | $104K |
| Hail | Very Low | 0.11 / yr | $29K |
| Tornado | Very Low | 0.13 / yr | $38K |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Cold Wave | Very Low | 0.00 / 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 Tuolumne County?
Tuolumne County has a composite FEMA National Risk Index score of 85.2 out of 100, placing it in the Medium category and the 85th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Tuolumne County?
The three highest-rated hazards are Wildfire (High, $27M EAL), Landslide (Medium, $59K EAL), Heat Wave (Medium, $3M EAL). These account for most of the county's expected annual losses.
How does Tuolumne County compare to other California counties?
Tuolumne County ranks #46 of 58 California counties for overall natural disaster risk, with a medium 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. Tuolumne County's $51M EAL is a statistical average, not a guarantee for any specific year or address.