67 counties mapped. On average, 10% of Alabama 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 % |
|---|---|---|---|
| Lowndes | Severe | 55% | 22% |
| Montgomery | Severe | 52% | 15% |
| Bullock | Severe | 37% | 24% |
| Sumter | Severe | 37% | 31% |
| Marengo | Severe | 33% | 26% |
| Greene | Severe | 32% | 12% |
| Wilcox | High | 28% | 40% |
| Jackson | High | 25% | 9% |
| Lawrence | High | 24% | 16% |
| Perry | High | 24% | 25% |
| Dallas | High | 22% | 37% |
| Morgan | High | 22% | 13% |
| Madison | High | 21% | 27% |
| Macon | High | 19% | 34% |
| Hale | High | 19% | 29% |
| Russell | High | 18% | 24% |
| Colbert | High | 18% | 22% |
| Franklin | High | 16% | 8% |
| Butler | Moderate | 14% | 30% |
| Monroe | Moderate | 11% | 17% |
| Choctaw | Moderate | 10% | 29% |
| Conecuh | Moderate | 10% | 9% |
| Crenshaw | Moderate | 10% | 10% |
| Cherokee | Moderate | 9% | 21% |
| Clarke | Moderate | 8% | 32% |
| Calhoun | Moderate | 8% | 14% |
| Marshall | Moderate | 6% | 13% |
| Dale | Moderate | 6% | 14% |
| Pickens | Moderate | 6% | 24% |
| Barbour | Low | 5% | 15% |
| St. Clair | Low | 5% | 30% |
| Pike | Low | 4% | 14% |
| Blount | Low | 4% | 18% |
| Etowah | Low | 4% | 20% |
| Chilton | Low | 3% | 18% |
| Washington | Low | 3% | 9% |
| Coffee | Low | 3% | 21% |
| Henry | Low | 2% | 6% |
| DeKalb | Low | 2% | 12% |
| Elmore | Low | 2% | 18% |
| Jefferson | Low | 2% | 10% |
| Baldwin | Low | 2% | 13% |
| Fayette | Low | 2% | 23% |
| Covington | Low | 2% | 2% |
| Clay | Low | 2% | 2% |
| Shelby | Low | 2% | 28% |
| Coosa | Low | 2% | 6% |
| Talladega | Low | 1% | 29% |
| Lee | Low | 1% | 4% |
| Bibb | Low | 1% | 20% |
| Geneva | Low | 1% | 7% |
| Tallapoosa | Low | 1% | 6% |
| Tuscaloosa | Low | 1% | 14% |
| Limestone | Low | 1% | 26% |
| Autauga | Low | 0% | 14% |
| Houston | Low | 0% | 5% |
| Lamar | Low | 0% | 30% |
| Chambers | Low | 0% | 1% |
| Cullman | Low | 0% | 17% |
| Marion | Low | 0% | 19% |
| Mobile | Low | 0% | 6% |
| Cleburne | Low | 0% | 30% |
| Escambia | Low | 0% | 10% |
| Lauderdale | Low | 0% | 8% |
| Randolph | Low | 0% | 1% |
| Walker | Low | 0% | 22% |
| Winston | Low | 0% | 9% |
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.