McLennan 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 McLennan County, Texas.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Wilson clay loam, 0 to 2 percent slopes | 42K | Moderately well drained | C | Very limited | Very limited |
| Houston Black clay, 1 to 3 percent slopes | 41K | Moderately well drained | D | Very limited | Very limited |
| Heiden clay, 1 to 3 percent slopes | 38K | Well drained | D | Very limited | Very limited |
| Aledo gravelly clay loam, 1 to 8 percent slopes | 35K | Well drained | D | Very limited | Very limited |
| Slidell silty clay, 0 to 2 percent slopes | 30K | Moderately well drained | D | Very limited | Very limited |
| Tinn clay, 0 to 1 percent slopes, frequently flooded | 26K | Moderately well drained | D | Very limited | Very limited |
| Crawford silty clay, 1 to 3 percent slopes | 25K | Well drained | D | Very limited | Very limited |
| Branyon clay, 0 to 1 percent slopes | 22K | Moderately well drained | D | Very limited | Very limited |
| Stephen-Eddy complex, 2 to 5 percent slopes | 22K | Well drained | D | Very limited | Very limited |
| Purves clay, 1 to 3 percent slopes | 20K | Well drained | D | Very limited | Very limited |
| Axtell fine sandy loam, 1 to 3 percent slopes | 20K | Moderately well drained | C | Very limited | Very limited |
| Lott silty clay, 5 to 8 percent slopes | 18K | Well drained | C | Somewhat limited | Very limited |
| Water | 15K | D | Not rated | Not rated | |
| Heiden clay, 5 to 8 percent slopes | 14K | Well drained | D | Very limited | Very limited |
| Lewisville silty clay, 1 to 3 percent slopes | 13K | Well drained | C | Very limited | Very limited |
| Frio silty clay, 0 to 1 percent slopes, occasionally flooded | 13K | Well drained | C | Very limited | Very limited |
| Bolar gravelly clay loam, 1 to 4 percent slopes | 13K | Well drained | C | Very limited | Very limited |
| Fairlie clay, 1 to 3 percent slopes | 13K | Moderately well drained | D | Very limited | Very limited |
| Denton silty clay, 1 to 3 percent slopes | 13K | Well drained | C | Somewhat limited | Somewhat limited |
| Burleson clay, 0 to 1 percent slopes | 12K | Moderately well drained | D | Very limited | Very limited |
What This Means
Building & Foundations
About 89% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 93% 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
Drainage is generally favorable for gardening. Adding compost and mulch will improve fertility and water retention. Test your soil's pH before planting — most vegetables prefer 6.0-7.0.