Mercer County Disaster Risk

Mercer County has a FEMA National Risk Index rating of Relatively High, placing it in the 95th 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.

Mercer County is evaluated for five major natural hazard types: flooding (97th percentile), hurricane (95th percentile), earthquake (94th percentile), tornado (82th percentile), wildfire (73th percentile). The highest-risk hazard is flooding at the 97th 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.

Mercer County's composite risk percentile is 95th, compared to the New Jersey state average of 91th percentile. The state's overall risk rating is Relatively Moderate. This means Mercer County faces higher natural disaster risk than the typical county in New Jersey.

Yes, Mercer County's flooding risk is at the 97th 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.

Mercer County's composite risk score of 95th percentile is above the New Jersey state average of 91th percentile. This elevated risk is driven by flooding exposure (97th percentile), along with hurricane and earthquake and tornado and wildfire risk. Geographic location, terrain, climate patterns, and proximity to flood zones or fault lines all influence a county's risk profile.