riskbycounty
FEMA National Risk Index

Chester County Disaster Risk

Chester County, South Carolina

FEMA Risk Rating

Relatively Low

National Percentile

43th

of 3,144 counties

State Rank

#39

of 46 (1 = highest risk)

Flood Risk

42th

percentile

Hazard Risk Breakdown

Flood

River, coastal, and surface flooding risk

Very Low

Higher than 42% of US counties

Wildfire

Wildland and wildland-urban interface fire risk

Relatively Low

Higher than 45% of US counties

Tornado

Tornado and severe thunderstorm risk

Relatively Low

Higher than 74% of US counties

Earthquake

Seismic activity and ground shaking risk

Relatively Low

Higher than 71% of US counties

Hurricane

Tropical cyclone and hurricane risk

Relatively Low

Higher than 64% of US counties

Risk Advisory: Chester County

Risk Verdict

Chester County shows a relatively low overall disaster risk profile, scoring in the 43th 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

Tornado risk is the dominant hazard for Chester County, scoring in the 74th percentile nationally. It is followed by earthquake risk at the 71th percentile. Additional hazards include hurricane (64th), wildfire (45th), flood (42th).

Preparedness Context

With tornado risk as the top concern, Chester County residents should identify a safe room or interior space on the lowest floor, have a NOAA weather radio, and practice tornado drills with your household. Secondary risks such as earthquake 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

Chester County is notably safer than the average county in South Carolina. Its composite risk score is 27.6 points lower than the state average, indicating below-average exposure to natural hazards relative to other counties in the state.

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Frequently Asked Questions

What is the natural disaster risk in Chester County, SC?
Chester County has a FEMA National Risk Index rating of Relatively Low, placing it in the 43th 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 Chester County?
Chester County is evaluated for five major natural hazard types: tornado (74th percentile), earthquake (71th percentile), hurricane (64th percentile), wildfire (45th percentile), flooding (42th percentile). The highest-risk hazard is tornado at the 74th 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 Chester County risk compare to the South Carolina average?
Chester County's composite risk percentile is 43th, compared to the South Carolina state average of 71th percentile. The state's overall risk rating is Relatively Low. This means Chester County faces lower natural disaster risk than the typical county in South Carolina.
Is Chester County at risk for tornado?
Yes, Chester County's tornado risk is at the 74th percentile nationally. This is above the national median. For flooding specifically, Chester County is at the 42th 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 Chester County a safe place to live?
Chester County's composite risk score of 43th percentile is below the South Carolina state average of 71th percentile, indicating relatively lower exposure to natural hazards. However, no county is completely risk-free. The primary hazard type is tornado at the 74th percentile. Residents should still maintain emergency preparedness plans and appropriate insurance coverage.

Counties with Similar Risk

Abbeville County

South Carolina

+2.2

Relatively Low

45th percentile

Fairfield County

South Carolina

-2.4

Very Low

41th percentile

Barnwell County

South Carolina

+2.7

Relatively Low

46th 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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