Hillsborough County Disaster Risk

Hillsborough County has a FEMA National Risk Index rating of Relatively High, placing it in the 99th 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.

Hillsborough County is evaluated for five major natural hazard types: tornado (100th percentile), hurricane (99th percentile), flooding (98th percentile), wildfire (96th percentile), earthquake (69th percentile). The highest-risk hazard is tornado at the 100th 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.

Hillsborough County's composite risk percentile is 99th, compared to the Florida state average of 76th percentile. The state's overall risk rating is Relatively Low. This means Hillsborough County faces higher natural disaster risk than the typical county in Florida.

Yes, Hillsborough County's tornado risk is at the 100th percentile nationally. This places it in the top quartile for this hazard type. For flooding specifically, Hillsborough County is at the 98th 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.

Hillsborough County's composite risk score of 99th percentile is above the Florida state average of 76th percentile. This elevated risk is driven by tornado exposure (100th percentile), along with hurricane and flooding and wildfire and earthquake risk. Geographic location, terrain, climate patterns, and proximity to flood zones or fault lines all influence a county's risk profile.