Union County, SC
FEMA National Risk Index scores, disaster declarations & hazard data
Union County has experienced 23 federally declared disasters since 1977, most recently Severe Winter Storm in 2026. Its overall natural hazard risk is rated Relatively Low — lower risk than most US counties.
Union County's highest-rated hazards are ice storm, lightning, and cold wave, with its top risk rated "Relatively High" by FEMA's National Risk Index. Community vulnerability is elevated (92nd percentile nationally), suggesting residents may face greater difficulty recovering from major disasters.
Past disasters & FEMA designations
A federal disaster declaration officially designates a county for FEMA disaster assistance. Union County has been designated in 23 declarations since 1977, covering 8 disaster types including hurricane (10), tropical storm (3), severe ice storm (3).
| Year | Type | Event name |
|---|---|---|
| 2026 | Winter Storm | Severe Winter Storm |
| 2024 | Tropical Storm | Tropical Storm Debby |
| 2024 | Hurricane | Hurricane Helene |
| 2024 | Tropical Storm | Hurricane Helene |
| 2024 | Tropical Storm | Hurricane Debby |
| 2023 | Hurricane | Hurricane Idalia |
| 2023 | Hurricane | Hurricane Ian |
| 2022 | Hurricane | Hurricane Ian |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 |
Showing the 10 most recent of 23 total declarations since 1977.
Source: FEMA OpenFEMA Disaster Declarations Summaries. A single disaster can produce more than one record per county. Data current through September 2026.
Risk by hazard type
| Hazard | Risk rating | Risk score | Recorded events | Deaths | Prop. damage |
|---|---|---|---|---|---|
| Wildfire | Very Low | 53.5 | 0 | 0 | — |
| Inland Flooding | Relatively Low | 53.4 | 0 | 0 | — |
| Coastal Flooding | Not Applicable | — | 0 | 0 | — |
| Earthquake | Relatively Low | 74.1 | — | — | — |
| Heat Wave | Relatively Low | 70.6 | 0 | 0 | — |
| Tornado | Relatively Moderate | 79.1 | 6 | 1 | $60K |
| Hurricane | Relatively Low | 71.1 | 0 | 0 | — |
| Hail | Relatively Low | 51.5 | 9 | 0 | — |
| Strong Wind | Relatively Moderate | 64.6 | 0 | 0 | — |
| Winter Weather | Very Low | 14.9 | 0 | 0 | — |
| Ice Storm | Relatively High | 88.4 | — | — | — |
| Cold Wave | Relatively Moderate | 79.4 | — | — | — |
| Lightning | Relatively High | 84 | 0 | 0 | — |
| Drought | Very Low | 27.4 | 0 | 0 | — |
| Landslide | Very Low | 58.4 | 0 | 0 | — |
| Avalanche | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
| Volcanic Activity | Not Applicable | — | — | — | — |
Scores are 0–100 percentiles relative to all US counties — higher means more exposed, not that a disaster is likely this year. Event counts: NOAA Storm Events 2016–2026; earthquake counts from USGS ComCat (M3.0+, 1996–2026). See the methodology page for details.
Community vulnerability
Union County ranks in the 92nd percentile (High) for community vulnerability — a measure of how hard disaster impacts tend to hit residents. Higher vulnerability means more displacement, worse health outcomes, and slower recovery after a disaster.
| SVI theme | Percentile | Vulnerability level |
|---|---|---|
| Overall | 92nd | High |
| Socioeconomic status | 92nd | High |
| Household characteristics | 81st | High |
| Racial & ethnic minority status | 73rd | Moderate |
| Housing type & transportation | 88th | High |
Source: CDC/ATSDR Social Vulnerability Index 2022. Percentiles compare counties nationally — higher means more vulnerable relative to other counties. See CDC SVI for full methodology.
Future risk outlook
| Wildfire metric | National percentile | Level |
|---|---|---|
| Burn probability | 55th | Relatively Moderate |
| Risk to homes | 51st | Relatively Moderate |
| Buildings in direct exposure zone | 79.2% | — |
Wildfire: USDA Forest Service Wildfire Risk to Communities (RDS-2020-0016-2) — modeled values, not annual forecasts. See wildfirerisk.org. Inland flood and heat projections pending data availability; coastal sea-level projections are available for select coastal counties below — see the data page.
Nearby counties
Frequently asked questions
What natural hazards pose the greatest risk in Union County?
According to the FEMA National Risk Index, the highest-risk hazards in Union County, South Carolina are ice storm, lightning, and cold wave. The county's overall natural hazard risk is rated Relatively Low — lower risk than most US counties.
Has Union County received federal disaster declarations?
Yes. Union County has received 23 federal disaster declarations since 1977, including declarations in 2026. The most common disaster type on record is hurricane (10 declarations).
Has Union County had any FEMA disaster declarations in 2024, 2025, or 2026?
Yes. Recent federal disaster declarations for Union County include Severe Winter Storm (2026), Tropical Storm Debby (2024), Hurricane Helene (2024), Hurricane Helene (2024), Hurricane Debby (2024). See the declarations table above for the full history since 1977.
How does Union County's natural hazard risk compare to nearby counties?
Among neighboring counties, Spartanburg County, SC has the highest overall natural hazard risk (Relatively Moderate) and Chester County, SC has the lowest (Relatively Low). Union County is rated Relatively Low overall.
How is Union County's composite disaster risk index calculated?
Union County's composite disaster risk index — officially FEMA's National Risk Index (NRI) — scores every US county on a 0–100 percentile scale across 18 natural hazard types, factoring in expected annual loss, social vulnerability, and community resilience. Union County's composite score of 58 means its overall natural hazard risk is higher than 58% of US counties.