Tulsa County, Oklahoma
The dominant drainage class is Somewhat poorly 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 Tulsa County, Oklahoma.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Dennis silt loam, 1 to 3 percent slopes | 28K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Okemah-Parsons-Pharoah complex, 0 to 1 percent slopes | 27K | Somewhat poorly drained | D | Very limited | Very limited |
| Dennis-Radley complex, 0 to 12 percent slopes | 25K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Dennis-Pharoah complex, 1 to 3 percent slopes | 22K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Urban land-Dennis complex, 0 to 5 percent slopes | 16K | D | Not limited | Somewhat limited | |
| Eram-Coweta complex, 5 to 15 percent slopes | 16K | Moderately well drained | D | Very limited | Very limited |
| Niotaze-Bigheart-Rock outcrop complex, 15 to 25 percent slopes, extremely stony | 15K | Somewhat poorly drained | D | Very limited | Very limited |
| Radley silt loam, 0 to 1 percent slopes, frequently flooded | 14K | Moderately well drained | B | Very limited | Very limited |
| Wynona silty clay loam, 0 to 1 percent slopes, occasionally flooded | 13K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Dennis silt loam, 3 to 5 percent slopes, eroded | 13K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Osage silty clay, 0 to 1 percent slopes, occasionally flooded | 12K | Poorly drained | D | Very limited | Very limited |
| Water | 12K | Not rated | Not rated | ||
| Niotaze-Bigheart-Rock outcrop complex, 3 to 15 percent slopes, very stony | 12K | Somewhat poorly drained | D | Very limited | Very limited |
| Choska-Severn-Urban land complex, 0 to 1 percent slopes, rarely flooded | 11K | Well drained | B | Very limited | Very limited |
| Coweta-Urban land-Eram complex, 3 to 12 percent slopes | 10K | Well drained | D | Very limited | Very limited |
| Coweta-Bates complex, 3 to 5 percent slopes | 10K | Well drained | D | Very limited | Very limited |
| Choska very fine sandy loam, 0 to 1 percent slopes, rarely flooded | 8K | Well drained | B | Very limited | Very limited |
| Dennis silt loam, 3 to 5 percent slopes | 8K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Okemah silt loam, 0 to 1 percent slopes | 8K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Severn very fine sandy loam, 0 to 3 percent slopes, rarely flooded | 6K | Well drained | B | Very limited | Very limited |
What This Means
Building & Foundations
About 90% 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 90% of soils are rated "very limited" for septic absorption fields. Poorly drained soils can't absorb septic effluent effectively. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Many soils hold water for extended periods. Raised beds are highly recommended to improve drainage for vegetables. Well-adapted native plants and water-loving species will do best in natural conditions.