Grundy County Disaster Risk

Grundy County has a FEMA National Risk Index rating of Relatively Low, placing it in the 67th 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.

Grundy County is evaluated for five major natural hazard types: tornado (69th percentile), flooding (66th percentile), earthquake (56th percentile), wildfire (16th percentile), hurricane (9th percentile). The highest-risk hazard is tornado at the 69th 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.

Grundy County's composite risk percentile is 67th, compared to the Illinois state average of 55th percentile. The state's overall risk rating is Relatively Low. This means Grundy County faces higher natural disaster risk than the typical county in Illinois.

Yes, Grundy County's tornado risk is at the 69th percentile nationally. This is above the national median. For flooding specifically, Grundy County is at the 66th 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.

Grundy County's composite risk score of 67th percentile is above the Illinois state average of 55th percentile. This elevated risk is driven by tornado exposure (69th percentile), along with flooding and earthquake risk. Geographic location, terrain, climate patterns, and proximity to flood zones or fault lines all influence a county's risk profile.