72 counties mapped. On average, 8% of Wisconsin 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.
Foundation repair is one of the most over-sold jobs in home services — quotes for the same house can vary 3×. Before you sign anything, learn how to get honest bids and what a fair price looks like.
Before you call a foundation company →| County | Tier | High-risk % | Moderate % |
|---|---|---|---|
| Iowa | Severe | 40% | 32% |
| Brown | Severe | 39% | 22% |
| Lafayette | Severe | 38% | 49% |
| Green | Severe | 34% | 41% |
| Winnebago | Severe | 32% | 29% |
| Ozaukee | Severe | 31% | 41% |
| Calumet | High | 28% | 43% |
| Sheboygan | High | 26% | 49% |
| Manitowoc | High | 24% | 40% |
| Grant | High | 24% | 48% |
| Bayfield | High | 22% | 0% |
| Douglas | High | 20% | 0% |
| Ashland | High | 19% | 2% |
| Richland | High | 19% | 42% |
| Outagamie | High | 16% | 29% |
| Kewaunee | Moderate | 14% | 43% |
| Kenosha | Moderate | 14% | 68% |
| Racine | Moderate | 14% | 70% |
| Dane | Moderate | 11% | 56% |
| Vernon | Moderate | 10% | 49% |
| Pierce | Moderate | 10% | 50% |
| Fond du Lac | Moderate | 10% | 67% |
| Door | Moderate | 10% | 2% |
| Milwaukee | Moderate | 8% | 45% |
| Crawford | Moderate | 7% | 53% |
| Rock | Moderate | 7% | 70% |
| Burnett | Moderate | 6% | 3% |
| Waushara | Moderate | 6% | 2% |
| Monroe | Moderate | 5% | 23% |
| Green Lake | Moderate | 5% | 38% |
| Clark | Low | 5% | 17% |
| Wood | Low | 4% | 31% |
| Buffalo | Low | 4% | 28% |
| Waupaca | Low | 4% | 3% |
| Jefferson | Low | 3% | 47% |
| Waukesha | Low | 3% | 65% |
| Pepin | Low | 3% | 28% |
| Adams | Low | 2% | 5% |
| Portage | Low | 2% | 5% |
| Iron | Low | 2% | 2% |
| Eau Claire | Low | 2% | 15% |
| Juneau | Low | 2% | 12% |
| St. Croix | Low | 2% | 34% |
| Sauk | Low | 2% | 45% |
| La Crosse | Low | 2% | 30% |
| Dunn | Low | 1% | 16% |
| Trempealeau | Low | 1% | 25% |
| Marquette | Low | 1% | 12% |
| Columbia | Low | 1% | 33% |
| Jackson | Low | 1% | 9% |
| Chippewa | Low | 1% | 13% |
| Marinette | Low | 1% | 4% |
| Washington | Low | 1% | 65% |
| Polk | Low | 0% | 3% |
| Washburn | Low | 0% | 0% |
| Dodge | Low | 0% | 70% |
| Marathon | Low | 0% | 22% |
| Shawano | Low | 0% | 12% |
| Barron | Low | 0% | 6% |
| Florence | Low | 0% | 3% |
| Forest | Low | 0% | 0% |
| Langlade | Low | 0% | 2% |
| Lincoln | Low | 0% | 0% |
| Menominee | Low | 0% | 4% |
| Oconto | Low | 0% | 7% |
| Oneida | Low | 0% | 0% |
| Price | Low | 0% | 1% |
| Rusk | Low | 0% | 1% |
| Sawyer | Low | 0% | 0% |
| Taylor | Low | 0% | 2% |
| Vilas | Low | 0% | 2% |
| Walworth | Low | 0% | 77% |
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.