12 counties mapped. On average, 0% of Maine 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 % |
|---|---|---|---|
| York | Low | 3% | 9% |
| Kennebec | Low | 0% | 18% |
| Waldo | Low | 0% | 1% |
| Somerset | Low | 0% | 10% |
| Aroostook | Low | 0% | 0% |
| Hancock | Low | 0% | 14% |
| Penobscot | Low | 0% | 9% |
| Oxford | Low | 0% | 0% |
| Piscataquis | Low | 0% | 0% |
| Washington | Low | 0% | 22% |
| Piscataquis and Northern Somerset | Low | 0% | 0% |
| Hancock and Western Washington | Low | 0% | 1% |
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.