Washington County, Oklahoma
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 Washington County, Oklahoma.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Dennis silt loam, 1 to 3 percent slopes | 37K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Bates-Coweta complex, 3 to 5 percent slopes | 30K | Well drained | C | Somewhat limited | Very limited |
| Shidler stony silty clay loam, 1 to 20 percent slopes | 20K | Well drained | D | Very limited | Very limited |
| Osage clay, 0 to 1 percent slopes, occasionally flooded | 19K | Poorly drained | D | Very limited | Very limited |
| Coweta-Eram complex, 5 to 20 percent slopes | 18K | Well drained | D | Very limited | Very limited |
| Verdigris clay loam, 0 to 1 percent slopes, occasionally flooded | 16K | Well drained | C | Very limited | Very limited |
| Eram-Verdigris complex, 0 to 12 percent slopes | 14K | Moderately well drained | D | Very limited | Very limited |
| Summit silty clay loam, 1 to 3 percent slopes | 14K | Moderately well drained | D | Very limited | Very limited |
| Okemah silt loam, 0 to 1 percent slopes | 13K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Dennis silt loam, 3 to 5 percent slopes | 11K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Verdigris silt loam, 0 to 1 percent slopes, frequently flooded | 10K | Well drained | B | Very limited | Very limited |
| Parsons silt loam, 0 to 1 percent slopes | 9K | Somewhat poorly drained | D | Very limited | Very limited |
| Water | 8K | Not rated | Not rated | ||
| Verdigris silt loam, 0 to 1 percent slopes, occasionally flooded | 7K | Well drained | B | Very limited | Very limited |
| Eram clay loam, 5 to 15 percent slopes | 6K | Moderately well drained | D | Very limited | Very limited |
| Summit silty clay loam, 3 to 5 percent slopes | 6K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Niotaze-Bigheart-Rock outcrop complex, 15 to 25 percent slopes, extremely stony | 6K | Somewhat poorly drained | D | Very limited | Very limited |
| Aliceville silty clay loam, 1 to 3 percent slopes | 4K | Moderately well drained | D | Very limited | Very limited |
| Bartlesville-Bigheart complex, 1 to 5 percent slopes, very rocky | 3K | Moderately well drained | C | Very limited | Very limited |
| Dennis silt loam, 3 to 5 percent slopes, eroded | 3K | Somewhat poorly drained | C/D | Very limited | Very limited |
What This Means
Building & Foundations
About 85% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 96% 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.