64 parishes mapped. On average, 32% of Louisiana parish soil area is high shrink-swell clay (USDA SSURGO).
Higher percentages mean more of a parish's mapped soil is shrink-swell clay that expands and contracts with moisture. This is parish-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 →| Parish | Tier | High-risk % | Moderate % |
|---|---|---|---|
| Tensas | Severe | 75% | 8% |
| Madison | Severe | 72% | 15% |
| St. James | Severe | 70% | 16% |
| Assumption | Severe | 68% | 20% |
| Concordia | Severe | 66% | 8% |
| Iberville | Severe | 64% | 17% |
| East Carroll | Severe | 60% | 18% |
| St. Martin | Severe | 57% | 11% |
| Avoyelles | Severe | 57% | 24% |
| De Soto | Severe | 56% | 7% |
| St. Mary | Severe | 52% | 4% |
| Natchitoches | Severe | 48% | 12% |
| Jefferson Davis | Severe | 48% | 26% |
| Catahoula | Severe | 47% | 14% |
| West Baton Rouge | Severe | 46% | 32% |
| Ascension | Severe | 46% | 36% |
| St. Charles | Severe | 45% | 9% |
| St. John the Baptist | Severe | 43% | 8% |
| Bossier | Severe | 42% | 22% |
| Lafourche | Severe | 42% | 6% |
| Cameron | Severe | 41% | 3% |
| St. Landry | Severe | 41% | 35% |
| Vermilion | Severe | 40% | 16% |
| Sabine | Severe | 38% | 12% |
| Caddo | Severe | 38% | 13% |
| Terrebonne | Severe | 34% | 4% |
| Livingston | Severe | 32% | 28% |
| Rapides | Severe | 32% | 22% |
| Iberia | Severe | 31% | 19% |
| St. Bernard | High | 30% | 1% |
| Morehouse | High | 30% | 17% |
| Red River | High | 29% | 16% |
| Pointe Coupee | High | 29% | 40% |
| Calcasieu | High | 29% | 16% |
| Orleans | High | 29% | 3% |
| Jefferson | High | 27% | 4% |
| Webster | High | 27% | 16% |
| Richland | High | 26% | 29% |
| Evangeline | High | 26% | 33% |
| Caldwell | High | 25% | 21% |
| Grant | High | 25% | 3% |
| LaSalle | High | 24% | 16% |
| Ouachita | High | 24% | 7% |
| Vernon | High | 22% | 2% |
| Acadia | High | 21% | 52% |
| Franklin | High | 21% | 32% |
| Plaquemines | High | 20% | 2% |
| Bienville | High | 20% | 20% |
| Claiborne | High | 19% | 17% |
| West Feliciana | Moderate | 14% | 4% |
| West Carroll | Moderate | 13% | 26% |
| Beauregard | Moderate | 13% | 13% |
| Lafayette | Moderate | 11% | 41% |
| Winn | Moderate | 11% | 32% |
| Jackson | Moderate | 8% | 36% |
| Union | Moderate | 8% | 18% |
| East Baton Rouge | Moderate | 7% | 46% |
| Lincoln | Low | 5% | 18% |
| St. Tammany | Low | 4% | 3% |
| Allen | Low | 4% | 10% |
| Tangipahoa | Low | 2% | 8% |
| East Feliciana | Low | 0% | 1% |
| Washington | Low | 0% | 0% |
| St. Helena | Low | 0% | 2% |
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.