14 counties mapped. On average, 1% of Vermont 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 % |
|---|---|---|---|
| Grand Isle | Moderate | 9% | 6% |
| Addison | Moderate | 5% | 31% |
| Chittenden | Low | 3% | 9% |
| Rutland | Low | 2% | 2% |
| Franklin | Low | 1% | 5% |
| Bennington | Low | 0% | 0% |
| Caledonia | Low | 0% | 0% |
| Essex | Low | 0% | 0% |
| Lamoille | Low | 0% | 0% |
| Orange | Low | 0% | 0% |
| Orleans | Low | 0% | 2% |
| Washington | Low | 0% | 2% |
| Windham | Low | 0% | 0% |
| Windsor | Low | 0% | 0% |
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.