62 counties mapped. On average, 2% of New York 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 % |
|---|---|---|---|
| Jefferson | High | 15% | 10% |
| Niagara | Moderate | 13% | 22% |
| Washington | Moderate | 12% | 3% |
| Ontario | Moderate | 11% | 9% |
| St. Lawrence | Moderate | 11% | 4% |
| Seneca | Moderate | 11% | 20% |
| Livingston | Moderate | 8% | 9% |
| Monroe | Moderate | 6% | 11% |
| Erie | Moderate | 6% | 16% |
| Orleans | Moderate | 5% | 18% |
| Genesee | Low | 4% | 15% |
| Schoharie | Low | 3% | 7% |
| Clinton | Low | 3% | 2% |
| Essex | Low | 3% | 1% |
| Cayuga | Low | 3% | 8% |
| Montgomery | Low | 3% | 20% |
| Madison | Low | 2% | 6% |
| Schuyler | Low | 2% | 3% |
| Ulster | Low | 2% | 3% |
| Greene | Low | 1% | 3% |
| Onondaga | Low | 1% | 6% |
| Yates | Low | 1% | 3% |
| Franklin | Low | 1% | 1% |
| Schenectady | Low | 1% | 11% |
| Oswego | Low | 1% | 2% |
| Columbia | Low | 1% | 5% |
| Wayne | Low | 1% | 4% |
| Albany | Low | 0% | 10% |
| Lewis | Low | 0% | 4% |
| Oneida | Low | 0% | 4% |
| Dutchess | Low | 0% | 1% |
| Sullivan | Low | 0% | 0% |
| Allegany | Low | 0% | 7% |
| Bronx | Low | 0% | 0% |
| Broome | Low | 0% | 0% |
| Cattaraugus | Low | 0% | 10% |
| Chautauqua | Low | 0% | 2% |
| Chemung | Low | 0% | 2% |
| Chenango | Low | 0% | 0% |
| Cortland | Low | 0% | 1% |
| Delaware | Low | 0% | 0% |
| Fulton | Low | 0% | 3% |
| Hamilton | Low | 0% | 0% |
| Herkimer | Low | 0% | 3% |
| Kings | Low | 0% | 1% |
| Nassau | Low | 0% | 0% |
| New York | Low | 0% | 0% |
| Orange | Low | 0% | 3% |
| Otsego | Low | 0% | 1% |
| Putnam | Low | 0% | 0% |
| Queens | Low | 0% | 0% |
| Rensselaer | Low | 0% | 5% |
| Richmond | Low | 0% | 1% |
| Rockland | Low | 0% | 0% |
| Saratoga | Low | 0% | 8% |
| Steuben | Low | 0% | 4% |
| Suffolk | Low | 0% | 0% |
| Tioga | Low | 0% | 0% |
| Tompkins | Low | 0% | 7% |
| Warren | Low | 0% | 1% |
| Westchester | Low | 0% | 0% |
| Wyoming | Low | 0% | 6% |
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.