King 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 King County, Texas.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Cottonwood-Knoco complex, 3 to 20 percent slopes | 78K | Well drained | D | Very limited | Very limited |
| Talpa-Knoco-Rock outcrop complex, 5 to 30 percent slopes | 61K | Well drained | D | Very limited | Very limited |
| Woodward-Deepwood complex, warm, 3 to 5 percent slopes | 38K | Well drained | C | Somewhat limited | Very limited |
| Tilvern clay loam, 1 to 3 percent slopes | 37K | Well drained | D | Very limited | Very limited |
| Woodward-Deepwood-Quinlan complex, warm, 2 to 12 percent slopes | 35K | Well drained | C | Somewhat limited | Very limited |
| Carey loam, 1 to 3 percent slopes | 31K | Well drained | B | Not limited | Somewhat limited |
| Westill clay loam, 0 to 1 percent slopes | 31K | Well drained | D | Very limited | Very limited |
| Deepwood-Woodward-Quinlan complex, warm, 2 to 45 percent slopes | 29K | Well drained | B | Not limited | Somewhat limited |
| Talpa gravelly loam, 1 to 5 percent slopes | 28K | Well drained | D | Very limited | Very limited |
| Vernon-Knoco complex, cool, 1 to 12 percent slopes | 25K | Well drained | D | Somewhat limited | Very limited |
| Rock outcrop-Cottonwood complex, 20 to 45 percent slopes | 19K | D | Very limited | Very limited | |
| Badland and Knoco soils, dry, 2 to 20 percent slopes | 16K | Well drained | D | Very limited | Very limited |
| Talpa-Quanah complex, 0 to 3 percent slopes | 15K | Well drained | D | Very limited | Very limited |
| Quanah-Talpa complex, 1 to 8 percent slopes | 12K | Well drained | B | Somewhat limited | Somewhat limited |
| Deepwood-Quinlan-Cottonwood complex, 5 to 50 percent slopes | 12K | Well drained | D | Very limited | Very limited |
| Carey loam, 0 to 1 percent slopes | 11K | Well drained | B | Not limited | Somewhat limited |
| Woodward-Deepwood complex, warm, 5 to 8 percent slopes | 11K | Well drained | C | Somewhat limited | Very limited |
| Grandfield fine sandy loam, 1 to 3 percent slopes | 8K | Well drained | B | Not limited | Very limited |
| Quanah silty clay loam, 1 to 3 percent slopes | 7K | Well drained | B | Somewhat limited | Somewhat limited |
| St. Paul silt loam, 0 to 1 percent slopes | 6K | Well drained | C | Somewhat limited | Very limited |
What This Means
Building & Foundations
About 57% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes. A geotechnical assessment is recommended before building.
Septic Systems
About 82% 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.