Natural Disaster Risk in Mercer Island
Washington
Risk Summary for Mercer Island
Mercer Island scores 7.2/10 (High risk), above the U.S. average of 4.5. The leading hazard is Avalanche.
Top Hazards
All 18 Hazard Scores
How it compares
Live Conditions
🏠 What this means for insurance
Above-average risk — check your policy limits
Standard homeowners insurance may not fully cover all hazards rated highly in this area. Verify that your policy includes adequate coverage for the top local hazards, and ask your insurer about specific endorsements or separate policies (e.g., flood, earthquake).
This is general information only. Consult a licensed insurance professional for advice specific to your property.
Natural Hazard Profile: Mercer Island, Washington
Located in the Pacific Northwest in King County, Mercer Island is a city of approximately 25,307 residents. The oceanic climate that characterizes this part of Washington — marked by mild, rainy winters west of the Cascades and semi-arid conditions to the east — directly influences the types and severity of natural hazards present, making Mercer Island a community where hazard awareness has real practical value.
FEMA rates Mercer Island's composite natural disaster risk at 7.2 out of 10 — high risk. Avalanche risk is the dominant natural hazard, with steep mountain terrain and heavy seasonal snowpack creating conditions for dangerous snow slides in and around the area. Residents should also account for earthquake and volcano risk in their preparedness planning.
Relative to other U.S. communities, Mercer Island's natural disaster risk is well above the U.S. national average of 4.5/10, slightly above the 5.8/10 state average. The hazard distribution here is led by avalanche and earthquake, as measured by FEMA across King County. While city-specific sub-county variation exists, these scores represent the best available federal risk estimate.
Mercer Island's high risk designation reflects meaningful exposure to natural hazards. Residents should verify that their insurance covers the area's primary risks, prepare a family emergency plan, and stay informed about seasonal hazard peaks through local weather and emergency management services.
What this means for Mercer Island: Avalanche preparedness
- Be aware of slope angles and recent snow loading, which drive avalanche risk.
- Properties in runout zones may require specialized hazard assessment and insurance.
- Check avalanche forecasts before backcountry travel and carry a beacon, probe, and shovel.
Local Factors for Mercer Island
These city-level factors differentiate Mercer Island from other communities in King County and provide geographic context for its hazard exposure.
Population
25,307
SuburbanGeographic Zone
Pacific Coast
Tsunami, coastal flood & wildfire risk
Climate Band
Northern Continental
Latitude 47.6°
Flood Terrain
Minimal — county topography limits flood risk
Flood score: 1.0/10
Wildfire Exposure
High — long dry fire season
Fire score: 8.2/10
Coordinates
47.5661° N, 122.2320° W
King County
Population and coordinates from SimpleMaps US Cities data. Hazard scores from FEMA National Risk Index. Geographic classification derived from coordinates.
Recent Climate Data for Mercer Island
Last 12 months · Source: Open-Meteo archive
Notable Weather Days (last 12 months)
ZIP Codes in Mercer Island
Other cities in Washington
Data source: FEMA National Risk Index (NRI). Scores normalized to 1–10 across all US counties. City scores inherit county-level FEMA data. For informational purposes only.