Ontario County Disaster Risk

Ontario County has a FEMA National Risk Index rating of Relatively Low, placing it in the 64th 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.

Ontario County is evaluated for five major natural hazard types: flooding (79th percentile), hurricane (59th percentile), earthquake (53th percentile), tornado (44th percentile), wildfire (38th percentile). The highest-risk hazard is flooding at the 79th 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.

Ontario County's composite risk percentile is 64th, compared to the New York state average of 69th percentile. The state's overall risk rating is Relatively Low. This means Ontario County faces lower natural disaster risk than the typical county in New York.

Yes, Ontario County's flooding risk is at the 79th percentile nationally. This places it in the top quartile for this hazard type.

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.

Ontario County's composite risk score of 64th percentile is below the New York state average of 69th percentile, indicating relatively lower exposure to natural hazards. However, no county is completely risk-free. The primary hazard type is flooding at the 79th percentile. Residents should still maintain emergency preparedness plans and appropriate insurance coverage.