12 counties mapped. On average, 0% of Massachusetts 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 % |
|---|---|---|---|
| Hampden | Low | 1% | 0% |
| Worcester | Low | 1% | 0% |
| Hampshire | Low | 0% | 3% |
| Barnstable | Low | 0% | 1% |
| Berkshire | Low | 0% | 0% |
| Dukes | Low | 0% | 2% |
| Franklin | Low | 0% | 0% |
| Middlesex | Low | 0% | 0% |
| Nantucket | Low | 0% | 1% |
| Plymouth | Low | 0% | 0% |
| Bristol | Low | 0% | 0% |
| Essex | Low | 0% | 4% |
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.