Greenville County, South Carolina Natural Disaster Risk
FEMA National Risk Index assessment · SC
MediumComposite Risk Score
National percentile: 94th
Greenville County faces medium composite natural disaster risk (NRI Risk Index score 94.0, 94th national percentile), driven primarily by ice storm and lightning exposure. Expected annual loss across all 18 hazard types is $169M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Risk Overview
Greenville County carries a medium composite natural disaster risk, with a National Risk Index score of 94.0 out of 100 — placing it in the 94th national percentile and near the national midpoint for natural-disaster risk. The score blends Expected Annual Loss, Social Vulnerability, and Community Resilience across all 18 FEMA hazard types.
The county's risk is driven primarily by ice storm (freezing rain that coats surfaces in heavy, damaging ice) at Very High risk — $6M in expected annual loss and about 1.83 events per year; lightning (electrical discharges from storms that ignite fires and cause casualties) at Very High risk — $4M in expected annual loss and about 56.29 events per year; and tornado (violently rotating columns of air capable of catastrophic local damage) at High risk — $20M in expected annual loss and about 0.46 events per year. Across all hazards, FEMA estimates $169M in expected annual loss for a population of 525K.
Beyond physical exposure, Greenville County has a low social vulnerability rating (how susceptible the population is to harm) and a medium community resilience rating (its capacity to prepare for and recover from disasters). Both measures sit toward the lower end, indicating relatively modest population sensitivity.
The federal record bears this out: Greenville County has received 26 federal disaster declarations since 1977, including 11 for hurricane events and 3 for severe ice storm events. The most recent was Severe Winter Storm (winter storm), declared in April 2026.
Among 46 South Carolina counties, Greenville County ranks #5 for overall natural disaster risk.
Top Hazards
All 18 Hazard Risks
| Ice Storm | Very High | 1.83 / yr | $6M |
| Lightning | Very High | 56.29 / yr | $4M |
| Tornado | High | 0.46 / yr | $20M |
| Riverine Flood | High | 2.79 / yr | $104M |
| Cold Wave | High | 0.38 / yr | $15M |
| Earthquake | Medium | 0.00 / yr | $9M |
| Hail | Medium | 4.80 / yr | $2M |
| Strong Wind | High | 2.56 / yr | $2M |
| Heat Wave | Medium | 1.14 / yr | $2M |
| Hurricane | Medium | 0.04 / yr | $3M |
| Landslide | Low | 0.89 / yr | $17K |
| Winter Weather | Low | 4.76 / yr | $91K |
| Wildfire | Very Low | 0.00 / yr | $73K |
| Drought | Low | 42.13 / yr | $149K |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Coastal Flood | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Disaster History
Greenville County has received 26 federal disaster declarations since 1977, most recently Severe Winter Storm in April 2026. Most frequent causes: Hurricane (11), Severe Ice Storm (3), Winter Storm (2).
| Declared | Type | Disaster |
|---|---|---|
| April 2026 | Winter Storm | Severe Winter Storm |
| January 2026 | Winter Storm | Severe Winter Storm |
| March 2025 | Fire | Table Rock Fire Complex |
| September 2024 | Hurricane | Hurricane Helene |
| September 2024 | Tropical Storm | Hurricane Helene |
| August 2024 | Tropical Storm | Hurricane Debby |
| August 2023 | Hurricane | Hurricane Idalia |
| November 2022 | Hurricane | Hurricane Ian |
| September 2022 | Hurricane | Hurricane Ian |
| March 2020 | Biological | Covid-19 Pandemic |
Showing the 10 most recent of 26 declarations.
Source: FEMA Disaster Declarations Summaries (OpenFEMA).
Frequently Asked Questions
What is the overall natural disaster risk for Greenville County?
Greenville County has a composite FEMA National Risk Index score of 94.0 out of 100, placing it in the Medium category and the 94th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Greenville County?
The three highest-rated hazards are Ice Storm (Very High, $6M EAL), Lightning (Very High, $4M EAL), Tornado (High, $20M EAL). These account for most of the county's expected annual losses.
How does Greenville County compare to other South Carolina counties?
Greenville County ranks #5 of 46 South Carolina counties for overall natural disaster risk, with a medium rating.
How many federally declared disasters has Greenville County had?
FEMA records 26 federal disaster declarations for Greenville County since 1977, most often 11 for hurricane events and 3 for severe ice storm events. The most recent was Severe Winter Storm, declared in April 2026.
What does Expected Annual Loss (EAL) mean?
EAL is FEMA's estimate of average annual dollar losses from natural hazards, calculated from historical event data and exposure models. Greenville County's $169M EAL is a statistical average, not a guarantee for any specific year or address.