Oklahoma 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 Oklahoma County, Oklahoma.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Stephenville-Darnell-Newalla complex, 3 to 8 percent slopes | 60K | Well drained | D | Very limited | Very limited |
| Harrah fine sandy loam, 3 to 5 percent slopes | 37K | Well drained | B | Not limited | Very limited |
| Urban land | 30K | D | Not limited | Somewhat limited | |
| Stephenville-Darnell complex, 1 to 5 percent slopes | 28K | Well drained | C | Somewhat limited | Very limited |
| Renthin-Urban land complex, 1 to 5 percent slopes | 21K | Well drained | D | Very limited | Very limited |
| Stephenville-Urban land-Newalla complex, 1 to 8 percent slopes | 12K | Well drained | D | Somewhat limited | Very limited |
| Renthin silty clay loam, 3 to 5 percent slopes, eroded | 12K | Well drained | D | Very limited | Very limited |
| Stephenville-Darnell-Newalla complex, 3 to 8 percent slopes, eroded | 10K | Well drained | C | Somewhat limited | Very limited |
| Kirkland-Urban land complex, 0 to 1 percent slopes | 10K | Well drained | D | Very limited | Very limited |
| Water | 9K | D | Not rated | Not rated | |
| Kirkland silt loam, 0 to 1 percent slopes | 9K | Well drained | D | Very limited | Very limited |
| Tribbey fine sandy loam, 0 to 1 percent slopes, frequently flooded | 9K | Somewhat poorly drained | B | Very limited | Very limited |
| Ashport silt loam, 0 to 1 percent slopes, frequently flooded | 8K | Well drained | B | Very limited | Very limited |
| Teller-Urban land complex, 1 to 8 percent slopes | 8K | Well drained | B | Not limited | Very limited |
| Stephenville-Darnell-Gullied land complex, 3 to 8 percent slopes | 8K | Well drained | C | Somewhat limited | Very limited |
| Littleaxe fine sandy loam, 1 to 3 percent slopes | 7K | Well drained | B | Not limited | Very limited |
| Pulaski fine sandy loam, 0 to 1 percent slopes, occasionally flooded | 7K | Well drained | A | Very limited | Very limited |
| Grainola-Ashport, frequently flooded, complex, 0 to 12 percent slopes | 7K | Well drained | D | Somewhat limited | Very limited |
| Harrah fine sandy loam, 3 to 45 percent slopes | 7K | Well drained | B | Very limited | Very limited |
| Norge-Urban land complex, 1 to 5 percent slopes | 7K | Well drained | C | Somewhat limited | Very limited |
What This Means
Building & Foundations
About 46% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 87% 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.