23 counties mapped. On average, 16% of New Mexico 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 % |
|---|---|---|---|
| Mora | Severe | 46% | 31% |
| Colfax | Severe | 46% | 33% |
| Grant | Severe | 43% | 22% |
| Hidalgo | Severe | 38% | 23% |
| Luna | High | 29% | 31% |
| Catron | High | 26% | 44% |
| San Miguel | High | 25% | 33% |
| Union | High | 20% | 40% |
| Sierra | High | 18% | 24% |
| Harding | Moderate | 15% | 20% |
| Quay | Moderate | 11% | 37% |
| Rio Arriba | Moderate | 10% | 43% |
| Santa Fe | Moderate | 10% | 51% |
| San Juan | Moderate | 6% | 46% |
| Socorro | Low | 4% | 34% |
| De Baca | Low | 4% | 28% |
| Chaves | Low | 3% | 31% |
| Guadalupe | Low | 2% | 63% |
| Lincoln | Low | 2% | 43% |
| Dona Ana | Low | 2% | 17% |
| Valencia | Low | 1% | 37% |
| Roosevelt | Low | 1% | 55% |
| Lea | Low | 1% | 47% |
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.