Seminole County, Oklahoma
The most common soil here is Stephenville, on about 23% of the land: a fine sand, loose sand that holds almost no water. Seminole and Darnell come next.
About 68% of the land drains well, and 19% stays wet for long stretches; groundwater comes within two feet of the surface under 37% of it.
USDA rates 94% of the land very limited for a standard septic drain field, and 42% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 14% of the land floods occasionally or more, and bedrock lies within 40 inches under 51% of it.
Soils change over short distances, so look up an address below for the soil at that exact spot and the reasons behind each rating.
The soils you're most likely standing on
The biggest named soils in Seminole County, Oklahoma, each drawn five feet deep from its official USDA description, in its recorded colors.
Dots mark gravel; white flecks mark lime. Shares are by acres across the survey area, and each mapped patch usually mixes several of these soils.
The biggest mapped areas
The dominant drainage class is Well drained and the dominant hydrologic group is C (slow infiltration, moderate runoff). The most common soil order is Mollisols — grassland soils with a thick, dark, fertile topsoil rich in organic matter. 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. Search your address to find the exact soil composition, drainage, and series details at your specific location.
| 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 |
Soil Orders in This Area
The USDA classifies every soil into one of 12 soil orders. Here are the dominant orders found in this survey area.
What This Means
Building & Foundations
About 42% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 94% 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.