riskbycounty
FEMA National Risk Index

Johnson County Disaster Risk

Johnson County, Illinois

FEMA Risk Rating

Relatively Low

National Percentile

51th

of 3,144 counties

State Rank

#58

of 102 (1 = highest risk)

Flood Risk

38th

percentile

Hazard Risk Breakdown

Flood

River, coastal, and surface flooding risk

Very Low

Higher than 38% of US counties

Wildfire

Wildland and wildland-urban interface fire risk

Very Low

Higher than 11% of US counties

Tornado

Tornado and severe thunderstorm risk

Relatively Low

Higher than 56% of US counties

Earthquake

Seismic activity and ground shaking risk

Moderate

Higher than 91% of US counties

Hurricane

Tropical cyclone and hurricane risk

Very Low

Higher than 38% of US counties

Risk Advisory: Johnson County

Risk Verdict

Johnson County shows a relatively low overall disaster risk profile, scoring in the 51th percentile nationally. The county faces moderate hazard exposure relative to other U.S. counties. Standard emergency preparedness is recommended, with attention to the specific hazards that dominate locally.

Hazard Breakdown

Earthquake risk is the dominant hazard for Johnson County, scoring in the 91th percentile nationally. It is followed by tornado risk at the 56th percentile. Additional hazards include hurricane (38th), flood (38th), wildfire (11th).

Preparedness Context

With earthquake risk as the top concern, Johnson County residents should secure heavy furniture and appliances, know how to shut off utilities, and keep emergency supplies accessible. Secondary risks such as tornado also warrant attention in household and community preparedness planning. FEMA recommends all households maintain at least 72 hours of food, water, and medication supplies regardless of specific hazard exposure.

Regional Context

Johnson County has a disaster risk profile close to the average county in Illinois. Its composite risk score is within 3.4 points of the state average, meaning its overall hazard exposure is broadly representative of Illinois as a whole.

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Frequently Asked Questions

What is the natural disaster risk in Johnson County, IL?
Johnson County has a FEMA National Risk Index rating of Relatively Low, placing it in the 51th 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.
What types of natural hazards affect Johnson County?
Johnson County is evaluated for five major natural hazard types: earthquake (91th percentile), tornado (56th percentile), hurricane (38th percentile), flooding (38th percentile), wildfire (11th percentile). The highest-risk hazard is earthquake at the 91th 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.
How does Johnson County risk compare to the Illinois average?
Johnson County's composite risk percentile is 51th, compared to the Illinois state average of 55th percentile. The state's overall risk rating is Relatively Low. This means Johnson County faces lower natural disaster risk than the typical county in Illinois.
Is Johnson County at risk for earthquake?
Yes, Johnson County's earthquake risk is at the 91th percentile nationally. This places it in the top quartile for this hazard type. For flooding specifically, Johnson County is at the 38th percentile.
How is natural disaster risk measured?
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.
Is Johnson County a safe place to live?
Johnson County's composite risk score of 51th percentile is below the Illinois state average of 55th percentile, indicating relatively lower exposure to natural hazards. However, no county is completely risk-free. The primary hazard type is earthquake at the 91th percentile. Residents should still maintain emergency preparedness plans and appropriate insurance coverage.

Counties with Similar Risk

Jo Daviess County

Illinois

+0.2

Relatively Low

51th percentile

Shelby County

Illinois

+0.7

Relatively Low

52th percentile

Lawrence County

Illinois

-1.8

Relatively Low

49th percentile

By Logan Johnson, Founder & Data EditorUpdated Reviewed by Logan Johnson, Founder & Data Editor

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.

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