Seminole County, Oklahoma
The dominant drainage class is Well drained and the dominant hydrologic group is C (slow infiltration, moderate 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 Seminole County, Oklahoma.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Stephenville-Darnell complex, 5 to 12 percent slopes | 73K | Well drained | C | Somewhat limited | Very limited |
| Stephenville-Darnell complex, 5 to 15 percent slopes, severely eroded | 36K | Well drained | C | Somewhat limited | Very limited |
| Seminole, Chickasha, and Mulhall soils, 3 to 8 percent slopes, severely eroded | 35K | Well drained | B | Not limited | Very limited |
| Niotaze-Wewoka complex, 3 to 12 percent slopes | 27K | Somewhat poorly drained | D | Very limited | Very limited |
| Niotaze-Darnell complex, 8 to 30 percent slopes | 25K | Somewhat poorly drained | D | Very limited | Very limited |
| Seminole loam, 3 to 5 percent slopes, eroded | 19K | Moderately well drained | C/D | Very limited | Very limited |
| Stephenville fine sandy loam, 3 to 5 percent slopes | 19K | Well drained | C | Somewhat limited | Very limited |
| Gowton loam, 0 to 1 percent slopes, occasionally flooded | 15K | Well drained | B | Very limited | Very limited |
| Gowton fine sandy loam, 0 to 1 percent slopes, frequently flooded | 13K | Well drained | B | Very limited | Very limited |
| Seminole-Gowton complex, 0 to 12 percent slopes, frequently flooded | 12K | Moderately well drained | C/D | Very limited | Very limited |
| Konawa fine sandy loam, 3 to 8 percent slopes, eroded | 11K | Well drained | B | Not limited | Very limited |
| Grainola-Lucien complex, 5 to 12 percent slopes | 9K | Well drained | D | Somewhat limited | Very limited |
| Konawa fine sandy loam, 3 to 8 percent slopes, gullied | 9K | Well drained | B | Not limited | Somewhat limited |
| Water | 8K | D | Not rated | Not rated | |
| Eufaula-Dougherty complex, 5 to 15 percent slopes | 7K | Well drained | B | Somewhat limited | Very limited |
| Pulaski fine sandy loam, 0 to 1 percent slopes, occasionally flooded | 6K | Well drained | A | Very limited | Very limited |
| Konawa fine sandy loam, 3 to 5 percent slopes | 6K | Well drained | B | Not limited | Very limited |
| Grainola and Aydelotte soils, 3 to 8 percent slopes, severely eroded | 6K | Well drained | D | Very limited | Very limited |
| Yahola fine sandy loam, 0 to 1 percent slopes, occasionally flooded | 5K | Well drained | A | Very limited | Very limited |
| Stephenville fine sandy loam, 1 to 3 percent slopes | 5K | Well drained | C | Somewhat limited | Very limited |
What This Means
Building & Foundations
About 37% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 95% 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.