Clarendon County, SC
FEMA National Risk Index scores, disaster declarations & hazard data
Clarendon County has experienced 26 federally declared disasters since 1989, most recently Severe Winter Storm in 2026. Its overall natural hazard risk is rated Relatively Low — lower risk than most US counties.
Clarendon County's highest-rated hazards are hurricane, lightning, and earthquake, with its top risk rated "Relatively High" by FEMA's National Risk Index. NOAA records 24 storm events in the county over the past decade. Community vulnerability is elevated (97th 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. Clarendon County has been designated in 26 declarations since 1989, covering 7 disaster types including hurricane (15), severe ice storm (3), biological (2).
| Year | Type | Event name |
|---|---|---|
| 2026 | Winter Storm | Severe Winter Storm |
| 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 |
| 2019 | Hurricane | Hurricane Dorian |
| 2018 | Hurricane | Hurricane Irma |
Showing the 10 most recent of 26 total declarations since 1989.
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 | Relatively Low | 81.2 | 0 | 0 | — |
| Inland Flooding | Relatively Low | 50.2 | 4 | 0 | $26K |
| Coastal Flooding | No Rating | 0 | 0 | 0 | — |
| Earthquake | Relatively Low | 88.4 | — | — | — |
| Heat Wave | Relatively Moderate | 83.1 | 0 | 0 | — |
| Tornado | Relatively Low | 60.3 | 10 | 0 | — |
| Hurricane | Relatively High | 94.2 | 0 | 0 | — |
| Hail | Relatively Low | 58.1 | 10 | 0 | $110 |
| Strong Wind | Relatively Moderate | 62.7 | 0 | 0 | — |
| Winter Weather | Relatively Low | 36.1 | 0 | 0 | — |
| Ice Storm | Relatively Moderate | 66.6 | — | — | — |
| Cold Wave | Relatively Low | 43.8 | — | — | — |
| Lightning | Relatively High | 93.4 | 0 | 0 | — |
| Drought | Relatively Low | 50.8 | 0 | 0 | — |
| Landslide | Very Low | 22.6 | 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
Clarendon County ranks in the 97th 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 | 97th | High |
| Socioeconomic status | 95th | High |
| Household characteristics | 65th | Moderate |
| Racial & ethnic minority status | 88th | High |
| Housing type & transportation | 99th | 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 | 77th | Relatively High |
| Risk to homes | 76th | Relatively High |
| Buildings in direct exposure zone | 83.0% | — |
NOAA tracked 24 weather events in this county over 2016–2025: 7 in 2016–20 vs 17 in 2021–25 .
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 Clarendon County?
According to the FEMA National Risk Index, the highest-risk hazards in Clarendon County, South Carolina are hurricane, lightning, and earthquake. The county's overall natural hazard risk is rated Relatively Low — lower risk than most US counties.
Has Clarendon County received federal disaster declarations?
Yes. Clarendon County has received 26 federal disaster declarations since 1989, including declarations in 2026. The most common disaster type on record is hurricane (15 declarations).
Has Clarendon County had any FEMA disaster declarations in 2024, 2025, or 2026?
Yes. Recent federal disaster declarations for Clarendon County include Severe Winter Storm (2026), Hurricane Helene (2024), Hurricane Debby (2024). See the declarations table above for the full history since 1989.
How does Clarendon County's natural hazard risk compare to nearby counties?
Among neighboring counties, Berkeley County, SC has the highest overall natural hazard risk (Relatively High) and Calhoun County, SC has the lowest (Very Low). Clarendon County is rated Relatively Low overall.
How is Clarendon County's composite disaster risk index calculated?
Clarendon 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. Clarendon County's composite score of 77 means its overall natural hazard risk is higher than 77% of US counties.