LaSalle County Disaster Risk
LaSalle County, Illinois
FEMA Risk Rating
Relatively Moderate
National Percentile
86th
of 3,144 counties
State Rank
#16
of 102 (1 = highest risk)
Flood Risk
88th
percentile
Hazard Risk Breakdown
Flood
River, coastal, and surface flooding risk
Moderate
Higher than 88% of US counties
Wildfire
Wildland and wildland-urban interface fire risk
Very Low
Higher than 21% of US counties
Tornado
Tornado and severe thunderstorm risk
Moderate
Higher than 84% of US counties
Earthquake
Seismic activity and ground shaking risk
Moderate
Higher than 82% of US counties
Hurricane
Tropical cyclone and hurricane risk
Very Low
Higher than 30% of US counties
Risk Overview
About Natural Disaster Risk in LaSalle County, Illinois
LaSalle County faces moderate-to-high risk nationally
With a composite risk score of 86.1 and a relatively moderate rating, LaSalle County's disaster exposure exceeds the national average. This score reflects meaningful vulnerability to flooding, tornadoes, and earthquakes that warrants proactive preparation.
Above average risk for Illinois
LaSalle County's score of 86.1 ranks it well above Illinois' state average of 54.5. The county is among the more hazard-prone areas in Illinois, though not in the highest tier of risk.
Riskier than some surrounding counties
LaSalle County's composite risk of 86.1 exceeds neighboring Livingston County (71.8) and Lee County (54.4). Its elevated flood risk of 88.2 and tornado risk of 84.1 position it as one of the more vulnerable counties in the region.
Flooding and tornadoes drive your risk
Flood risk of 88.2 and tornado risk of 84.1 are LaSalle County's primary hazard concerns. Both hazards have the potential to cause significant property damage and warrant serious mitigation planning.
Prioritize flood and wind protection
LaSalle County homeowners should ensure flood insurance is in place through the NFIP or a private carrier, as standard policies don't cover flood damage. Additionally, verify that your homeowners policy includes adequate coverage for wind and hail damage from severe thunderstorms and tornadoes.
Source: FEMA National Risk Index · Narrative reviewed by Evan Brooks, Data Editor
Preparedness Guide
What to Prepare for in LaSalle County
Top Hazards by Exposure
Source: FEMA National Risk Index v1.19.0 · Percentiles are national (3,144 counties)
Risk Advisory: LaSalle County
Risk Verdict
LaSalle County registers a moderately elevated natural disaster risk, ranking at the 86th percentile across all U.S. counties. High composite risk signals that multiple hazard types are elevated simultaneously; planning for more than one scenario is important in LaSalle County.
Hazard Breakdown
Flood risk is LaSalle County's dominant natural hazard, ranked at the 88th percentile nationally under FEMA's National Risk Index. Tornado ranks second at the 84th percentile nationally. Additional tracked hazards include earthquake (82th percentile), hurricane (30th percentile), wildfire (21th percentile).
Preparedness Context
LaSalle County's dominant hazard is flooding, ranked at the 88th percentile nationally. In addition to flood insurance, residents should identify their nearest evacuation shelter and store key documents in waterproof containers. Secondary tornado exposure at the 84th percentile adds a second preparedness layer; households should review coverage options and alert sign-up for both hazard types. LaSalle County's county emergency management office publishes hazard-specific guidance tailored to local conditions; bookmarking that resource and the county's alert system is a practical first step for any household.
Regional Context
LaSalle County falls 31.6 points above Illinois's typical county risk level, which means the hazard environment here is notably more demanding than the state baseline.
Is your household prepared for LaSalle County's hazards?
Review FEMA's county-specific preparedness checklists and emergency planning guides.
Frequently Asked Questions
What is the natural disaster risk in LaSalle County, IL?
What types of natural hazards affect LaSalle County?
How does LaSalle County risk compare to the Illinois average?
Is LaSalle County at risk for flooding?
How is natural disaster risk measured?
Why is LaSalle 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.