Honolulu County Disaster Risk

Honolulu 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.

Honolulu County is evaluated for five major natural hazard types: flooding (99th percentile), wildfire (99th percentile), earthquake (99th percentile), hurricane (73th percentile), tornado (33th percentile). The highest-risk hazard is flooding at the 99th 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.

Honolulu County's composite risk percentile is 99th, compared to the Hawaii state average of 75th percentile. The state's overall risk rating is Relatively Low. This means Honolulu County faces higher natural disaster risk than the typical county in Hawaii.

Yes, Honolulu County's flooding risk is at the 99th 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.

Honolulu County's composite risk score of 99th percentile is above the Hawaii state average of 75th percentile. This elevated risk is driven by flooding exposure (99th percentile), along with wildfire and earthquake and hurricane risk. Geographic location, terrain, climate patterns, and proximity to flood zones or fault lines all influence a county's risk profile.