Washtenaw County Disaster Risk
Washtenaw County, Michigan
FEMA Risk Rating
Relatively Moderate
National Percentile
89th
of 3,144 counties
State Rank
#6
of 83 (1 = highest risk)
Flood Risk
90th
percentile
Hazard Risk Breakdown
Flood
River, coastal, and surface flooding risk
Moderate
Higher than 90% of US counties
Wildfire
Wildland and wildland-urban interface fire risk
Relatively Low
Higher than 44% of US counties
Tornado
Tornado and severe thunderstorm risk
Relatively High
Higher than 97% of US counties
Earthquake
Seismic activity and ground shaking risk
Relatively Low
Higher than 74% of US counties
Hurricane
Tropical cyclone and hurricane risk
Relatively Low
Higher than 48% of US counties
Risk Overview
About Natural Disaster Risk in Washtenaw County, Michigan
Washtenaw faces moderate disaster risk
With a composite risk score of 89.28, Washtenaw County sits significantly above Michigan's state average of 49.56, placing it in the relatively moderate risk category. This score reflects exposure to multiple natural hazard types that residents should understand and prepare for.
High-risk county in Michigan landscape
Washtenaw ranks among Michigan's riskier counties due to its 89.28 composite score—nearly double the state average. The county's position reflects concentrated vulnerability to flooding and tornado activity that distinguishes it from most other Michigan communities.
Washtenaw outpaces regional peers
Washtenaw's risk score of 89.28 substantially exceeds nearby Wexford County's 33.91, though it falls below Wayne County's 98.95. This places Washtenaw in a middle tier of risk compared to its Michigan neighbors, facing real but not extreme hazard exposure.
Tornadoes and floods dominate locally
Tornado risk scores highest at 96.85, making severe wind events a serious concern, while flood risk at 90.30 threatens low-lying areas and properties near water. Earthquake risk of 74.27 also exceeds state norms, though it remains secondary to wind and water hazards for most residents.
Comprehensive coverage protects your investment
Standard homeowners insurance doesn't cover flood or earthquake damage—Washtenaw residents need separate policies given their 90.30 flood score and 74.27 earthquake exposure. A tornado-ready home plan including safe rooms or shelters, combined with appropriate insurance, provides essential protection for this moderate-risk county.
Source: FEMA National Risk Index · Narrative reviewed by Evan Brooks, Data Editor
Preparedness Guide
What to Prepare for in Washtenaw County
Top Hazards by Exposure
Source: FEMA National Risk Index v1.19.0 · Percentiles are national (3,144 counties)
Risk Advisory: Washtenaw County
Risk Verdict
Washtenaw County's overall risk score at the 89th percentile nationally signals meaningful exposure to multiple natural hazard types. Comprehensive household preparedness — including reviewing insurance, maintaining emergency supplies, and knowing evacuation routes — is strongly recommended.
Hazard Breakdown
Tornado risk is Washtenaw County's dominant natural hazard, ranked at the 97th percentile nationally under FEMA's National Risk Index. Flood ranks second at the 90th percentile nationally. Additional tracked hazards include earthquake (74th percentile), hurricane (48th percentile), wildfire (44th percentile).
Preparedness Context
Washtenaw County ranks at the 97th percentile nationally for tornado exposure. Unlike many slow-onset hazards, tornadoes in Washtenaw County can reach full intensity in minutes; a pre-practiced household shelter plan matters far more than stockpiled supplies. Alongside tornado exposure, flood at the 90th percentile nationally means Washtenaw County households face multi-hazard severe-weather seasons that benefit from a single integrated emergency plan covering both threats. Washtenaw County county emergency management typically publishes annual severe-weather preparedness guides tailored to local tornado patterns; households benefit from reviewing these before storm season begins each spring.
Regional Context
Compared to other Michigan counties, Washtenaw County runs 39.7 composite risk points higher than the state mean — reflecting above-average hazard concentration in this area.
Is your household prepared for Washtenaw County's hazards?
Review FEMA's county-specific preparedness checklists and emergency planning guides.
Frequently Asked Questions
What is the natural disaster risk in Washtenaw County, MI?
What types of natural hazards affect Washtenaw County?
How does Washtenaw County risk compare to the Michigan average?
Is Washtenaw County at risk for tornado?
How is natural disaster risk measured?
Why is Washtenaw County higher risk than average?
Data Source
Risk data sourced from the FEMA National Risk Index (NRI). Risk scores are relative rankings (0–100) across all US counties — not absolute risk measures. Higher scores indicate higher relative risk compared to other counties.
Disclaimer: This data is informational only. It is not financial, insurance, or legal advice. Always consult a qualified professional before making insurance or real estate decisions.