Sioux County Disaster Risk

Sioux County has a FEMA National Risk Index rating of Relatively Low, placing it in the 62th 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.

Sioux County is evaluated for five major natural hazard types: wildfire (81th percentile), tornado (25th percentile), flooding (10th percentile), earthquake (5th percentile). The highest-risk hazard is wildfire at the 81th 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.

Sioux County's composite risk percentile is 62th, compared to the North Dakota state average of 22th percentile. The state's overall risk rating is Very Low. This means Sioux County faces higher natural disaster risk than the typical county in North Dakota.

Yes, Sioux County's wildfire risk is at the 81th percentile nationally. This places it in the top quartile for this hazard type. For flooding specifically, Sioux County is at the 10th 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.

Sioux County's composite risk score of 62th percentile is above the North Dakota state average of 22th percentile. This elevated risk is driven by wildfire exposure (81th percentile). Geographic location, terrain, climate patterns, and proximity to flood zones or fault lines all influence a county's risk profile.