Johnson County Disaster Risk
Johnson County, Kansas
FEMA Risk Rating
Relatively High
National Percentile
95th
of 3,144 counties
State Rank
#2
of 105 (1 = highest risk)
Flood Risk
95th
percentile
Hazard Risk Breakdown
Flood
River, coastal, and surface flooding risk
Relatively High
Higher than 95% of US counties
Wildfire
Wildland and wildland-urban interface fire risk
Relatively Low
Higher than 61% of US counties
Tornado
Tornado and severe thunderstorm risk
Relatively High
Higher than 99% of US counties
Earthquake
Seismic activity and ground shaking risk
Relatively Low
Higher than 76% of US counties
Hurricane
Tropical cyclone and hurricane risk
Very Low
Higher than 0% of US counties
Risk Overview
About Natural Disaster Risk in Johnson County, Kansas
Johnson County: Highest Risk in Kansas
Johnson County's composite risk score of 94.85 places it in the Relatively High category and far above the national average. This metropolitan county faces exceptional exposure to floods, tornadoes, and earthquakes, making disaster preparedness essential.
Kansas's Most Disaster-Prone County
Johnson's 94.85 score towers above the Kansas average of 29.89, making it by far the state's highest-risk county in this sample. The gap reflects Johnson's dense urban development in flood-prone terrain and its position in Kansas's tornado alley.
Dramatically Riskier Than All Neighbors
Johnson (94.85) dwarfs neighboring Jefferson (19.66) and all other Kansas sample counties, with risk scores 3-16 times higher. This exceptional hazard exposure stems from Johnson's location in greater Kansas City's flood zone and tornado corridor.
Floods and Tornadoes: Johnson's Twin Threats
Flood risk reaches 94.88 and tornado risk 98.92—both among the nation's highest for any county. Earthquake risk at 75.70 and wildfire at 61.23 add additional layers of hazard exposure unusual for Kansas.
Comprehensive Coverage Is Non-Negotiable
Johnson County residents must carry flood insurance separately from homeowner policies—standard coverage excludes it entirely. Add a windstorm endorsement for tornadoes, verify earthquake coverage is available, and develop a family disaster plan with multiple evacuation routes.
Source: FEMA National Risk Index · Narrative reviewed by Evan Brooks, Data Editor
Preparedness Guide
What to Prepare for in Johnson County
Top Hazards by Exposure
Source: FEMA National Risk Index v1.19.0 · Percentiles are national (3,144 counties)
Risk Advisory: Johnson County
Risk Verdict
At the 95th percentile nationally, Johnson County is among the more hazard-exposed counties in the United States. Proactive preparedness — not reactive response — is key to managing life in one of the country's higher-risk counties; Johnson County residents should plan accordingly.
Hazard Breakdown
Tornado risk is Johnson County's dominant natural hazard, ranked at the 99th percentile nationally under FEMA's National Risk Index. Flood ranks second at the 95th percentile nationally. Additional tracked hazards include earthquake (76th percentile), wildfire (61th percentile), hurricane (0th percentile).
Preparedness Context
At the 99th percentile nationally for tornado risk, Johnson County households benefit most from a reliable alert system — a NOAA weather radio that activates during overnight hours when residents may not be checking smartphone alerts. The secondary flood hazard at the 95th percentile nationally adds seasonal complexity to Johnson County's preparedness calendar, since flood and tornado risk often peak at different points in the year. For Johnson County households, a pre-decided family shelter plan — who goes where, how children are retrieved from school during a warning, and a neighborhood meet-up point if phones fail — provides real protection that no supply kit alone can replicate.
Regional Context
At 65.0 points above the Kansas state average, Johnson County carries meaningfully higher natural disaster exposure than a typical Kansas county.
Is your household prepared for Johnson County's hazards?
Review FEMA's county-specific preparedness checklists and emergency planning guides.
Frequently Asked Questions
What is the natural disaster risk in Johnson County, KS?
What types of natural hazards affect Johnson County?
How does Johnson County risk compare to the Kansas average?
Is Johnson County at risk for tornado?
How is natural disaster risk measured?
Why is Johnson County higher risk than average?
Data Source
Risk data sourced from the FEMA National Risk Index (NRI). Risk scores are relative rankings (0–100) across all US counties — not absolute risk measures. Higher scores indicate higher relative risk compared to other counties.
Disclaimer: This data is informational only. It is not financial, insurance, or legal advice. Always consult a qualified professional before making insurance or real estate decisions.