Coal County, Oklahoma
The most common soil here is Homa, on about 18% of the land: a fine sandy loam, gritty and crumbly. Dennis and Wynona come next.
About 9% of the land drains well, and 34% stays wet for long stretches; groundwater comes within two feet of the surface under 80% of it.
USDA rates 99% of the land very limited for a standard septic drain field, and 93% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 18% of the land floods occasionally or more, and bedrock lies within 40 inches under 58% 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 Coal 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 Moderately well drained and the dominant hydrologic group is C/D (varies with drainage). 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 Coal 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 |
|---|---|---|---|---|---|
| Homa-Hector complex, 12 to 20 percent slopes | 69K | Moderately well drained | C/D | Very limited | Very limited |
| Steedman-Coweta complex, 2 to 20 percent slopes | 25K | Moderately well drained | D | Very limited | Very limited |
| Dela and Wynona soils, 0 to 1 percent slopes, frequently flooded | 25K | Moderately well drained | A | Very limited | Very limited |
| Homa-Clearview complex, 3 to 5 percent slopes | 21K | Moderately well drained | C/D | Very limited | Very limited |
| Dennis loam, 3 to 5 percent slopes, eroded | 16K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Wynona silt loam, 0 to 1 percent slopes, occasionally flooded | 15K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Steedman clay loam, 3 to 5 percent slopes | 14K | Moderately well drained | D | Very limited | Very limited |
| Dennis loam, 1 to 3 percent slopes | 12K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Clearview fine sandy loam, 3 to 5 percent slopes | 11K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Parsons silt loam, 1 to 3 percent slopes | 10K | Somewhat poorly drained | D | Very limited | Very limited |
| Bates and Dennis soils, 3 to 5 percent slopes, severely eroded | 9K | Somewhat poorly drained | C | Very limited | Very limited |
| Wynona silty clay loam, 0 to 1 percent slopes, occasionally flooded | 8K | Somewhat poorly drained | C | Very limited | Very limited |
| Shidler-Rock outcrop complex, 5 to 30 percent slopes | 7K | Well drained | D | Very limited | Very limited |
| Bosville loam, 3 to 5 percent slopes | 7K | Moderately well drained | D | Very limited | Very limited |
| Bates-Coweta complex, 1 to 5 percent slopes | 7K | Well drained | D | Somewhat limited | Very limited |
| Clearview fine sandy loam, 3 to 5 percent slopes, eroded | 6K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Pharoah silt loam, 0 to 1 percent slopes | 5K | Somewhat poorly drained | D | Very limited | Very limited |
| Durant loam, 1 to 3 percent slopes | 5K | Moderately well drained | D | Very limited | Very limited |
| Dennis loam, 3 to 5 percent slopes | 5K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Bates fine sandy loam, 3 to 5 percent slopes, eroded | 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 93% 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 99% 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.