Washita County, Oklahoma
The most common soil here is St. Paul, on about 16% of the land: a silt loam, smooth, like flour. Carey and Obaro come next.
About 99% of the land drains well.
USDA rates 86% of the land very limited for a standard septic drain field, and 27% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 8% of the land floods occasionally or more, and bedrock lies within 40 inches under 43% 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 Washita 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 Inceptisols — young soils with minimal horizon development but more than Entisols. 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 Washita 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 |
|---|---|---|---|---|---|
| St. Paul silt loam, 1 to 3 percent slopes | 86K | Well drained | C | Somewhat limited | Very limited |
| Cordell-Rock outcrop complex, 1 to 20 percent slopes | 38K | Somewhat excessively drained | D | Very limited | Very limited |
| Carey silt loam, 3 to 5 percent slopes | 37K | Well drained | B | Somewhat limited | Somewhat limited |
| Carey silt loam, 1 to 3 percent slopes | 36K | Well drained | B | Not limited | Somewhat limited |
| Grandfield fine sandy loam, 1 to 3 percent slopes | 34K | Well drained | B | Not limited | Very limited |
| Obaro silty clay loam, 3 to 5 percent slopes, eroded | 28K | Well drained | C | Somewhat limited | Very limited |
| Clairemont silt loam, 0 to 1 percent slopes, occasionally flooded, cool | 27K | Well drained | B | Very limited | Very limited |
| Woodward-Quinlan complex, 3 to 5 percent slopes | 26K | Well drained | C | Somewhat limited | Very limited |
| Cordell silty clay loam, 1 to 5 percent slopes, eroded | 22K | Somewhat excessively drained | D | Very limited | Very limited |
| Obaro silty clay loam, 3 to 5 percent slopes | 17K | Well drained | C | Somewhat limited | Very limited |
| Quinlan-Woodward complex, 5 to 12 percent slopes | 17K | Well drained | D | Very limited | Very limited |
| Dill-Pixlee complex, 1 to 3 percent slopes | 15K | Well drained | B | Somewhat limited | Very limited |
| St. Paul silt loam, 0 to 1 percent slopes | 14K | Well drained | C | Somewhat limited | Very limited |
| Dill-Pixlee complex, 3 to 5 percent slopes | 14K | Well drained | B | Somewhat limited | Very limited |
| Quinlan-Obaro complex, 5 to 12 percent slopes | 13K | Well drained | D | Very limited | Very limited |
| Grandfield fine sandy loam, 3 to 5 percent slopes | 13K | Well drained | B | Not limited | Very limited |
| Port silt loam, 0 to 1 percent slopes, occasionally flooded | 11K | Well drained | B | Very limited | Very limited |
| Quinlan-Woodward complex, 3 to 5 percent slopes, eroded | 11K | Well drained | D | Very limited | Very limited |
| Obaro silty clay loam, 1 to 3 percent slopes | 10K | Well drained | C | Somewhat limited | Very limited |
| Woodward-Clairemont complex, 0 to 12 percent slopes | 10K | 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 27% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 86% 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.