88 counties mapped. On average, 10% of Ohio 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 % |
|---|---|---|---|
| Paulding | Severe | 52% | 42% |
| Putnam | Severe | 43% | 50% |
| Meigs | Severe | 43% | 9% |
| Washington | Severe | 39% | 19% |
| Ottawa | Severe | 37% | 36% |
| Defiance | Severe | 32% | 56% |
| Gallia | High | 29% | 8% |
| Athens | High | 28% | 11% |
| Morgan | High | 28% | 26% |
| Noble | High | 28% | 22% |
| Lawrence | High | 27% | 9% |
| Monroe | High | 25% | 8% |
| Brown | High | 23% | 63% |
| Guernsey | High | 19% | 16% |
| Logan | High | 19% | 72% |
| Marion | High | 18% | 74% |
| Adams | High | 17% | 41% |
| Sandusky | High | 17% | 52% |
| Jackson | High | 16% | 18% |
| Ross | High | 15% | 50% |
| Williams | High | 15% | 70% |
| Lucas | Moderate | 15% | 30% |
| Hocking | Moderate | 14% | 5% |
| Clermont | Moderate | 14% | 61% |
| Pike | Moderate | 14% | 18% |
| Harrison | Moderate | 13% | 29% |
| Madison | Moderate | 13% | 83% |
| Perry | Moderate | 13% | 23% |
| Muskingum | Moderate | 12% | 25% |
| Warren | Moderate | 12% | 67% |
| Wyandot | Moderate | 12% | 75% |
| Vinton | Moderate | 12% | 17% |
| Butler | Moderate | 11% | 58% |
| Henry | Moderate | 11% | 75% |
| Fulton | Moderate | 10% | 54% |
| Hardin | Moderate | 8% | 88% |
| Mercer | Moderate | 8% | 85% |
| Mahoning | Moderate | 8% | 26% |
| Preble | Moderate | 8% | 83% |
| Scioto | Moderate | 8% | 13% |
| Hamilton | Moderate | 7% | 37% |
| Seneca | Moderate | 7% | 78% |
| Tuscarawas | Moderate | 7% | 32% |
| Highland | Moderate | 7% | 71% |
| Van Wert | Moderate | 7% | 90% |
| Auglaize | Moderate | 7% | 86% |
| Montgomery | Moderate | 6% | 78% |
| Union | Moderate | 6% | 92% |
| Erie | Moderate | 5% | 50% |
| Jefferson | Low | 5% | 40% |
| Clinton | Low | 4% | 87% |
| Belmont | Low | 4% | 31% |
| Stark | Low | 4% | 14% |
| Miami | Low | 4% | 91% |
| Portage | Low | 4% | 41% |
| Coshocton | Low | 3% | 20% |
| Fayette | Low | 2% | 97% |
| Darke | Low | 2% | 94% |
| Richland | Low | 2% | 62% |
| Allen | Low | 2% | 84% |
| Shelby | Low | 2% | 94% |
| Carroll | Low | 2% | 21% |
| Ashtabula | Low | 2% | 29% |
| Columbiana | Low | 2% | 19% |
| Summit | Low | 2% | 26% |
| Crawford | Low | 2% | 88% |
| Lorain | Low | 2% | 79% |
| Hancock | Low | 2% | 85% |
| Pickaway | Low | 2% | 87% |
| Delaware | Low | 1% | 87% |
| Medina | Low | 1% | 58% |
| Morrow | Low | 1% | 76% |
| Champaign | Low | 1% | 91% |
| Fairfield | Low | 1% | 68% |
| Franklin | Low | 1% | 76% |
| Cuyahoga | Low | 1% | 46% |
| Huron | Low | 1% | 81% |
| Geauga | Low | 1% | 46% |
| Clark | Low | 0% | 85% |
| Trumbull | Low | 0% | 45% |
| Greene | Low | 0% | 86% |
| Knox | Low | 0% | 48% |
| Licking | Low | 0% | 65% |
| Holmes | Low | 0% | 25% |
| Ashland | Low | 0% | 37% |
| Lake | Low | 0% | 39% |
| Wayne | Low | 0% | 29% |
| Wood | Low | 0% | 84% |
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.