46 counties mapped. On average, 4% of South Carolina county soil area is high shrink-swell clay (USDA SSURGO).
Higher percentages mean more of a county's mapped soil is shrink-swell clay that expands and contracts with moisture. This is county-scale exposure, not a diagnosis of any single home — but it tells you whether soil movement belongs on your radar.
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Before you call a foundation company →| County | Tier | High-risk % | Moderate % |
|---|---|---|---|
| Beaufort | Severe | 32% | 12% |
| York | High | 23% | 16% |
| Chester | Moderate | 15% | 28% |
| Newberry | Moderate | 13% | 7% |
| Georgetown | Moderate | 12% | 27% |
| Greenwood | Moderate | 11% | 13% |
| Fairfield | Moderate | 11% | 23% |
| McCormick | Moderate | 9% | 12% |
| Jasper | Moderate | 8% | 37% |
| Union | Moderate | 8% | 20% |
| Laurens | Moderate | 8% | 14% |
| Saluda | Moderate | 7% | 7% |
| Abbeville | Moderate | 6% | 13% |
| Horry | Moderate | 5% | 9% |
| Colleton | Low | 5% | 21% |
| Edgefield | Low | 3% | 5% |
| Berkeley | Low | 2% | 17% |
| Bamberg | Low | 2% | 11% |
| Lancaster | Low | 2% | 9% |
| Lexington | Low | 2% | 4% |
| Spartanburg | Low | 2% | 3% |
| Cherokee | Low | 1% | 43% |
| Kershaw | Low | 0% | 5% |
| Greenville | Low | 0% | 0% |
| Anderson | Low | 0% | 0% |
| Dorchester | Low | 0% | 10% |
| Aiken | Low | 0% | 2% |
| Pickens | Low | 0% | 2% |
| Oconee | Low | 0% | 1% |
| Allendale | Low | 0% | 5% |
| Calhoun | Low | 0% | 2% |
| Chesterfield | Low | 0% | 15% |
| Clarendon | Low | 0% | 0% |
| Darlington | Low | 0% | 15% |
| Dillon | Low | 0% | 31% |
| Florence | Low | 0% | 11% |
| Hampton | Low | 0% | 10% |
| Lee | Low | 0% | 1% |
| Marion | Low | 0% | 42% |
| Marlboro | Low | 0% | 27% |
| Orangeburg | Low | 0% | 9% |
| Richland | Low | 0% | 16% |
| Sumter | Low | 0% | 1% |
| Williamsburg | Low | 0% | 19% |
| Barnwell | Low | 0% | 0% |
| Charleston | Low | 0% | 2% |
Risk metrics are computed from USDA SSURGO soil survey data (linear extensibility of soil components, area-weighted by county). Soil varies lot to lot — this is county-scale context, not a substitute for a site-specific geotechnical or structural assessment.