Lancaster County, South Carolina Natural Disaster Risk
FEMA National Risk Index assessment · SC
LowComposite Risk Score
National percentile: 79th
Lancaster County faces low composite natural disaster risk (NRI Risk Index score 79.4, 79th national percentile), driven primarily by ice storm and strong wind exposure. Expected annual loss across all 18 hazard types is $40M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Risk Overview
Lancaster County carries a low composite natural disaster risk, with a National Risk Index score of 79.4 out of 100 — placing it in the 79th national percentile and below the national average for natural-disaster risk. The score blends Expected Annual Loss, Social Vulnerability, and Community Resilience across all 18 FEMA hazard types.
Risk here concentrates in ice storm (freezing rain that coats surfaces in heavy, damaging ice) at High risk — $1M in expected annual loss and about 1.48 events per year; strong wind (damaging straight-line winds outside of tornadoes and hurricanes) at High risk — $2M in expected annual loss and about 4.65 events per year; and tornado (violently rotating columns of air capable of catastrophic local damage) at Medium risk — $6M in expected annual loss and about 0.35 events per year. Across all hazards, FEMA estimates $40M in expected annual loss for a population of 96K.
Beyond physical exposure, Lancaster County has a medium 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.
History supports the rating: Lancaster County has received 24 federal disaster declarations since 1977, including 13 for hurricane events and 2 for tropical storm events. The most recent was Severe Winter Storm (winter storm), declared in January 2026.
Among 46 South Carolina counties, Lancaster County ranks #22 for overall natural disaster risk.
Top Hazards
All 18 Hazard Risks
| Ice Storm | High | 1.48 / yr | $1M |
| Strong Wind | High | 4.65 / yr | $2M |
| Tornado | Medium | 0.35 / yr | $6M |
| Cold Wave | Medium | 0.37 / yr | $6M |
| Earthquake | Low | 0.00 / yr | $2M |
| Riverine Flood | Medium | 0.68 / yr | $21M |
| Lightning | Medium | 54.36 / yr | $743K |
| Hurricane | Low | 0.16 / yr | $948K |
| Heat Wave | Low | 2.96 / yr | $520K |
| Hail | Low | 4.21 / yr | $287K |
| Landslide | Very Low | 0.60 / yr | $2K |
| Wildfire | Very Low | 0.00 / yr | $34K |
| Winter Weather | Low | 3.05 / yr | $53K |
| Drought | Very Low | 20.66 / yr | $26K |
| 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
Lancaster County has received 24 federal disaster declarations since 1977, most recently Severe Winter Storm in January 2026. Most frequent causes: Hurricane (13), Tropical Storm (2), Biological (2).
| Declared | Type | Disaster |
|---|---|---|
| January 2026 | Winter Storm | Severe Winter Storm |
| 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 |
| March 2020 | Biological | Covid-19 |
| September 2019 | Hurricane | Hurricane Dorian |
Showing the 10 most recent of 24 declarations.
Source: FEMA Disaster Declarations Summaries (OpenFEMA).
Frequently Asked Questions
What is the overall natural disaster risk for Lancaster County?
Lancaster County has a composite FEMA National Risk Index score of 79.4 out of 100, placing it in the Low category and the 79th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Lancaster County?
The three highest-rated hazards are Ice Storm (High, $1M EAL), Strong Wind (High, $2M EAL), Tornado (Medium, $6M EAL). These account for most of the county's expected annual losses.
How does Lancaster County compare to other South Carolina counties?
Lancaster County ranks #22 of 46 South Carolina counties for overall natural disaster risk, with a low rating.
How many federally declared disasters has Lancaster County had?
FEMA records 24 federal disaster declarations for Lancaster County since 1977, most often 13 for hurricane events and 2 for tropical storm events. The most recent was Severe Winter Storm, declared in January 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. Lancaster County's $40M EAL is a statistical average, not a guarantee for any specific year or address.