57 counties mapped. On average, 1% of Pennsylvania 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 % |
|---|---|---|---|
| Franklin | Moderate | 11% | 30% |
| Allegheny | Moderate | 9% | 19% |
| Fulton | Moderate | 6% | 8% |
| Beaver | Moderate | 6% | 10% |
| Westmoreland | Low | 4% | 20% |
| Centre | Low | 3% | 14% |
| Huntingdon | Low | 2% | 13% |
| Lancaster | Low | 2% | 29% |
| Cumberland | Low | 1% | 31% |
| Lebanon | Low | 1% | 27% |
| Blair | Low | 1% | 20% |
| Indiana | Low | 1% | 9% |
| Butler | Low | 1% | 20% |
| Fayette | Low | 1% | 26% |
| Armstrong | Low | 1% | 11% |
| Montour | Low | 1% | 20% |
| Union | Low | 1% | 18% |
| Bedford | Low | 0% | 15% |
| Clinton | Low | 0% | 5% |
| Perry | Low | 0% | 8% |
| Snyder | Low | 0% | 8% |
| Clarion | Low | 0% | 18% |
| Dauphin | Low | 0% | 5% |
| Northumberland | Low | 0% | 9% |
| Lawrence | Low | 0% | 8% |
| Venango | Low | 0% | 21% |
| York | Low | 0% | 7% |
| Adams | Low | 0% | 11% |
| Berks | Low | 0% | 24% |
| Bucks | Low | 0% | 10% |
| Cambria | Low | 0% | 19% |
| Carbon | Low | 0% | 2% |
| Chester | Low | 0% | 14% |
| Clearfield | Low | 0% | 7% |
| Columbia | Low | 0% | 4% |
| Crawford | Low | 0% | 3% |
| Delaware | Low | 0% | 9% |
| Erie | Low | 0% | 6% |
| Jefferson | Low | 0% | 18% |
| Lackawanna | Low | 0% | 0% |
| Lehigh | Low | 0% | 18% |
| Luzerne | Low | 0% | 0% |
| Lycoming | Low | 0% | 2% |
| McKean | Low | 0% | 5% |
| Mercer | Low | 0% | 1% |
| Monroe | Low | 0% | 0% |
| Montgomery | Low | 0% | 8% |
| Northampton | Low | 0% | 16% |
| Philadelphia | Low | 0% | 2% |
| Pike | Low | 0% | 0% |
| Potter | Low | 0% | 5% |
| Schuylkill | Low | 0% | 2% |
| Somerset | Low | 0% | 15% |
| Susquehanna | Low | 0% | 0% |
| Tioga | Low | 0% | 0% |
| Wayne | Low | 0% | 0% |
| Wyoming | 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.