Washington County, Texas
The dominant drainage class is Moderately 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 Washington County, Texas.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Frelsburg clay, 3 to 5 percent slopes | 34K | Moderately well drained | D | Very limited | Very limited |
| Falba fine sandy loam, 1 to 5 percent slopes | 21K | Moderately well drained | D | Very limited | Very limited |
| Bosque clay loam, frequently flooded | 21K | Well drained | B | Very limited | Very limited |
| Trinity clay, 0 to 1 percent slopes, frequently flooded | 18K | Moderately well drained | D | Very limited | Very limited |
| Chazos loamy fine sand, 1 to 5 percent slopes | 18K | Moderately well drained | C | Somewhat limited | Very limited |
| Bleiblerville clay, 1 to 3 percent slopes | 17K | Moderately well drained | D | Very limited | Very limited |
| Frelsburg clay, 1 to 3 percent slopes | 17K | Moderately well drained | D | Very limited | Very limited |
| Crockett fine sandy loam, 1 to 5 percent slopes | 15K | Moderately well drained | D | Somewhat limited | Very limited |
| Brenham clay loam, 3 to 8 percent slopes | 13K | Well drained | B | Somewhat limited | Somewhat limited |
| Carbengle clay loam, 5 to 8 percent slopes | 13K | Well drained | C | Somewhat limited | Very limited |
| Carbengle clay loam, 3 to 5 percent slopes | 13K | Well drained | C | Somewhat limited | Very limited |
| Frelsburg clay, 5 to 8 percent slopes | 12K | Moderately well drained | D | Very limited | Very limited |
| Latium clay, 5 to 8 percent slopes | 11K | Well drained | D | Very limited | Very limited |
| Brazoria clay, 0 to 1 percent slopes, rarely flooded | 10K | Moderately well drained | D | Very limited | Very limited |
| Tabor fine sandy loam, 1 to 5 percent slopes | 10K | Moderately well drained | D | Very limited | Very limited |
| Tremona loamy fine sand, 1 to 5 percent slopes | 9K | Somewhat poorly drained | A | Somewhat limited | Very limited |
| Water | 9K | D | Not rated | Not rated | |
| Burlewash fine sandy loam, 1 to 5 percent slopes | 8K | Well drained | D | Very limited | Very limited |
| Wilson clay loam, 1 to 3 percent slopes | 6K | Moderately well drained | D | Very limited | Very limited |
| Silawa loamy fine sand, 1 to 5 percent slopes | 6K | Well drained | B | Not limited | Very limited |
What This Means
Building & Foundations
About 66% of soils are rated "very limited" for dwellings with basements. Specific challenges include poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 92% 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.