San Juan County
Washington — Natural Disaster Risk Assessment
Very LowComposite Risk Score
National percentile: 35th
San Juan County faces very low composite natural disaster risk (NRI Risk Index score 35.4, 35th national percentile), driven primarily by earthquake and landslide exposure. Expected annual loss across all 18 hazard types is $10M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Earthquake | Low | 0.02 / yr | $4M |
| Landslide | Very Low | 0.33 / yr | $3K |
| Winter Weather | Low | 4.79 / yr | $79K |
| Coastal Flood | Low | 3.63 / yr | $354K |
| Riverine Flood | Low | 0.04 / yr | $5M |
| Wildfire | Very Low | 0.00 / yr | $25K |
| Volcanic Activity | Very Low | 0.00 / yr | $4 |
| Cold Wave | Low | 0.52 / yr | $398K |
| Ice Storm | Very Low | 0.04 / yr | $13K |
| Heat Wave | Very Low | 0.47 / yr | $28K |
| Tsunami | Very Low | 0.06 / yr | $31K |
| Lightning | Very Low | 4.28 / yr | $15K |
| Tornado | Very Low | 0.01 / yr | $13K |
| Hail | Very Low | 0.01 / yr | $808 |
| Strong Wind | Very Low | 0.00 / yr | $1K |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Drought | Very Low | 0.00 / yr | $0 |
| Hurricane | Very Low | 0.00 / yr | $0 |
Frequently Asked Questions
What is the overall natural disaster risk for San Juan County?
San Juan County has a composite FEMA National Risk Index score of 35.4 out of 100, placing it in the Very Low category and the 35th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in San Juan County?
The three highest-rated hazards are Earthquake (Low, $4M EAL), Landslide (Very Low, $3K EAL), Winter Weather (Low, $79K EAL). These account for most of the county's expected annual losses.
How does San Juan County compare to other Washington counties?
San Juan County ranks #33 of 39 Washington counties for overall natural disaster risk, with a very 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. San Juan County's $10M EAL is a statistical average, not a guarantee for any specific year or address.