Sequoyah County, Oklahoma
The most common soil here is Linker, on about 22% of the land: a fine sandy loam, gritty and crumbly. Hector and Enders come next.
About 66% of the land drains well, and 16% stays wet for long stretches; groundwater comes within two feet of the surface under 25% of it.
USDA rates 91% of the land very limited for a standard septic drain field, and 94% 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 61% 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 Sequoyah 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 D (very slow infiltration, high runoff). The most common soil order is Alfisols — moderately leached forest soils with a clay-enriched subsoil. 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 Sequoyah 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 |
|---|---|---|---|---|---|
| Hector-Linker-Enders complex, 5 to 40 percent slopes, extremely stony | 212K | Well drained | D | Very limited | Very limited |
| Linker-Hector complex, 3 to 5 percent slopes | 36K | Well drained | D | Very limited | Very limited |
| Stigler silt loam, 1 to 3 percent slopes | 31K | Moderately well drained | D | Very limited | Very limited |
| Water | 26K | D | Not rated | Not rated | |
| Guyton and Rexor soils, 0 to 1 percent slopes, frequently flooded | 14K | Poorly drained | C/D | Very limited | Very limited |
| Linker and Stigler soils, 3 to 8 percent slopes, severely eroded | 13K | Somewhat poorly drained | C | Very limited | Very limited |
| Stigler-Wrightsville silt loams complex, 0 to 1 percent slopes | 11K | Moderately well drained | D | Very limited | Very limited |
| Shermore loam, 3 to 5 percent slopes, moderately eroded | 9K | Somewhat poorly drained | D | Very limited | Very limited |
| Linker-Hector complex, 5 to 8 percent slopes | 8K | Well drained | C | Very limited | Very limited |
| Shermore loam, 3 to 5 percent slopes | 7K | Somewhat poorly drained | D | Very limited | Very limited |
| Guyton silt loam, 0 to 1 percent slopes, frequently flooded | 6K | Poorly drained | C/D | Very limited | Very limited |
| Coushatta silt loam, 0 to 1 percent slopes, rarely flooded | 6K | Well drained | B | Very limited | Somewhat limited |
| Mason silt loam, 0 to 1 percent slopes, rarely flooded | 6K | Moderately well drained | C | Very limited | Very limited |
| Cupco silt loam, 0 to 1 percent slopes, occasionally flooded | 6K | Very poorly drained | C/D | Very limited | Very limited |
| Oklared fine sandy loam, 0 to 3 percent slopes, occasionally flooded | 5K | Well drained | A | Very limited | Very limited |
| Kiomatia loamy fine sand, 0 to 3 percent slopes, occasionally flooded | 5K | Well drained | B | Very limited | Very limited |
| Shermore loam, 1 to 3 percent slopes | 5K | Somewhat poorly drained | D | Very limited | Very limited |
| Spiro silt loam, 3 to 5 percent slopes | 5K | Well drained | C | Very limited | Very limited |
| Vian silt loam, 1 to 3 percent slopes | 4K | Somewhat poorly drained | C | Very limited | Very limited |
| Stigler silt loam, 0 to 1 percent slopes | 3K | Moderately well drained | D | Very 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 94% 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 91% 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.