Bexar County, Texas
The dominant drainage class is Well drained and the dominant hydrologic group is D (very slow infiltration, high runoff). This report summarizes the major soil map units across the survey area to help you understand what to expect when buying, building, or gardening in Bexar County, Texas.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Eckrant cobbly clay, 1 to 8 percent slopes | 63K | Well drained | D | Very limited | Very limited |
| Lewisville silty clay, 0 to 1 percent slopes | 42K | Well drained | C | Very limited | Very limited |
| Aluf sand, 0 to 5 percent slopes | 42K | Somewhat excessively drained | A | Not limited | Very limited |
| Branyon clay, 0 to 1 percent slopes | 34K | Moderately well drained | D | Very limited | Very limited |
| Eckrant-Rock outcrop association, 8 to 30 percent slopes | 34K | Well drained | D | Very limited | Very limited |
| Eckrant very cobbly clay, 5 to 15 percent slopes | 34K | Well drained | D | Very limited | Very limited |
| Lewisville silty clay, 1 to 3 percent slopes | 32K | Well drained | C | Very limited | Very limited |
| Crawford, stony and Bexar soils, 0 to 5 percent slopes | 30K | Well drained | D | Very limited | Very limited |
| Houston Black clay, 1 to 3 percent slopes | 29K | Moderately well drained | D | Very limited | Very limited |
| Wilco loamy fine sand, 0 to 3 percent slopes | 28K | Well drained | C | Somewhat limited | Very limited |
| Houston Black gravelly clay, 1 to 3 percent slopes | 27K | Moderately well drained | D | Very limited | Very limited |
| Brackett gravelly clay loam, 12 to 20 percent slopes | 24K | Well drained | D | Very limited | Very limited |
| Houston Black gravelly clay, 3 to 5 percent slopes | 21K | Moderately well drained | D | Very limited | Very limited |
| Tinn and Frio soils, 0 to 1 percent slopes, frequently flooded | 20K | Moderately well drained | D | Very limited | Very limited |
| Miguel fine sandy loam, 1 to 3 percent slopes | 20K | Well drained | C | Somewhat limited | Very limited |
| Brackett-Eckrant association, 20 to 60 percent slopes | 17K | Well drained | D | Very limited | Very limited |
| San Antonio clay loam, 1 to 3 percent slopes | 17K | Well drained | C | Very limited | Very limited |
| Krum clay, 1 to 5 percent slopes | 14K | Well drained | C | Very limited | Very limited |
| Patrick soils, 1 to 3 percent slopes, rarely flooded | 14K | Well drained | B | Very limited | Very limited |
| Sunev clay loam, 1 to 3 percent slopes | 13K | Well drained | B | Not limited | Somewhat limited |
What This Means
Building & Foundations
About 81% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 97% of soils are rated "very limited" for septic absorption fields. Despite good drainage overall, limitations may stem from shallow bedrock, steep slopes, or seasonal conditions. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Well-drained soils on sloped terrain — good for most plants but watch for erosion. Terracing, contour planting, and mulching help retain moisture and topsoil. Drip irrigation is more effective than sprinklers on slopes.