Brown County Disaster Risk

Brown County has a FEMA National Risk Index rating of Very Low, placing it in the 5th percentile nationally out of 3,144 counties. This composite score reflects the county's overall exposure to natural hazards including floods, wildfires, tornadoes, earthquakes, and hurricanes, weighted by expected annual loss and social vulnerability.

Brown County is evaluated for five major natural hazard types: earthquake (28th percentile), tornado (18th percentile), hurricane (9th percentile), flooding (4th percentile), wildfire (0th percentile). The highest-risk hazard is earthquake at the 28th percentile nationally. These scores are derived from FEMA's National Risk Index, which analyzes expected annual loss, social vulnerability, and community resilience for each hazard type.

Brown County's composite risk percentile is 5th, compared to the Illinois state average of 55th percentile. The state's overall risk rating is Relatively Low. This means Brown County faces lower natural disaster risk than the typical county in Illinois.

Yes, Brown County's earthquake risk is at the 28th percentile nationally. This is below the national median, indicating relatively lower exposure. For flooding specifically, Brown County is at the 4th percentile.

FEMA's National Risk Index (NRI) calculates risk scores for 18 natural hazard types across all U.S. counties and census tracts. The composite score combines Expected Annual Loss (estimated dollar losses from each hazard), Social Vulnerability (demographic factors affecting disaster impact), and Community Resilience (ability to recover). Percentile scores rank each county against all 3,144 U.S. counties, and risk ratings range from Very Low to Very High.

Brown County's composite risk score of 5th percentile is below the Illinois state average of 55th percentile, indicating relatively lower exposure to natural hazards. However, no county is completely risk-free. The primary hazard type is earthquake at the 28th percentile. Residents should still maintain emergency preparedness plans and appropriate insurance coverage.