Williamsburg County
South Carolina — Natural Disaster Risk Assessment
MediumComposite Risk Score
National percentile: 82th
Williamsburg County faces medium composite natural disaster risk (NRI Risk Index score 82.1, 82th national percentile), driven primarily by hurricane and earthquake exposure. Expected annual loss across all 18 hazard types is $30M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Hurricane | High | 0.30 / yr | $15M |
| Earthquake | Medium | 0.00 / yr | $5M |
| Wildfire | Low | 0.00 / yr | $588K |
| Strong Wind | Medium | 3.43 / yr | $906K |
| Heat Wave | Low | 9.16 / yr | $773K |
| Ice Storm | Medium | 0.85 / yr | $188K |
| Lightning | Medium | 61.61 / yr | $373K |
| Cold Wave | Medium | 0.47 / yr | $1M |
| Riverine Flood | Low | 0.36 / yr | $6M |
| Hail | Low | 3.29 / yr | $174K |
| Drought | Low | 11.10 / yr | $68K |
| Tornado | Low | 0.51 / yr | $666K |
| Winter Weather | Low | 1.32 / yr | $29K |
| Coastal Flood | Very Low | 0.18 / yr | $734 |
| Landslide | Very Low | 0.20 / yr | $75 |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Frequently Asked Questions
What is the overall natural disaster risk for Williamsburg County?
Williamsburg County has a composite FEMA National Risk Index score of 82.1 out of 100, placing it in the Medium category and the 82th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Williamsburg County?
The three highest-rated hazards are Hurricane (High, $15M EAL), Earthquake (Medium, $5M EAL), Wildfire (Low, $588K EAL). These account for most of the county's expected annual losses.
How does Williamsburg County compare to other South Carolina counties?
Williamsburg County ranks #19 of 46 South Carolina counties for overall natural disaster risk, with a medium rating.
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. Williamsburg County's $30M EAL is a statistical average, not a guarantee for any specific year or address.