Johnston County, Oklahoma
The most common soil here is Gasil, on about 16% of the land: a fine sandy loam, gritty and crumbly. Chigley and Claremore come next.
About 65% of the land drains well, and 3% stays wet for long stretches; groundwater comes within two feet of the surface under 8% of it.
USDA rates 75% of the land very limited for a standard septic drain field, and 55% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 9% of the land floods occasionally or more, and bedrock lies within 40 inches under 38% 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 Johnston 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 Johnston 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 |
|---|---|---|---|---|---|
| Kiti-Rock outcrop complex, 1 to 25 percent slopes | 46K | Well drained | D | Very limited | Very limited |
| Claremore-Rock outcrop complex, 1 to 5 percent slopes | 34K | Well drained | D | Very limited | Very limited |
| Chigley-Rock outcrop complex, 1 to 8 percent slopes | 29K | Moderately well drained | C | Somewhat limited | Very limited |
| Chigley gravelly sandy loam, 1 to 3 percent slopes | 24K | Moderately well drained | C | Somewhat limited | Very limited |
| Gasil fine sandy loam, cool, 1 to 5 percent slopes, eroded | 23K | Well drained | B | Not limited | Somewhat limited |
| Agan silt loam, 0 to 2 percent slopes | 21K | Moderately well drained | D | Very limited | Very limited |
| Verdigris silty clay loam, 0 to 1 percent slopes, occasionally flooded | 17K | Well drained | B | Very limited | Very limited |
| Lula loam, 1 to 3 percent slopes | 17K | Well drained | B | Somewhat limited | Somewhat limited |
| Gasil fine sandy loam, 3 to 5 percent slopes, severely eroded | 14K | Well drained | B | Not limited | Somewhat limited |
| Gasil fine sandy loam, cool, 3 to 5 percent slopes | 13K | Well drained | B | Not limited | Somewhat limited |
| Gasil fine sandy loam, cool, 1 to 3 percent slopes | 12K | Well drained | B | Not limited | Somewhat limited |
| Burleson clay, 1 to 3 percent slopes | 12K | Moderately well drained | D | Very limited | Very limited |
| Gasil fine sandy loam, 8 to 12 percent slopes | 12K | Well drained | B | Somewhat limited | Somewhat limited |
| Durant loam, 1 to 3 percent slopes | 12K | Moderately well drained | D | Very limited | Very limited |
| Scullin-Kiti complex, 2 to 6 percent slopes | 11K | Well drained | C | Very limited | Very limited |
| Water | 9K | D | Not rated | Not rated | |
| Tribbey fine sandy loam, 0 to 2 percent slopes, frequently flooded | 9K | Somewhat poorly drained | B | Very limited | Very limited |
| Stephenville fine sandy loam, 3 to 5 percent slopes | 9K | Well drained | C | Somewhat limited | Very limited |
| Claremore-Lula complex, 3 to 5 percent slopes | 7K | Well drained | D | Very limited | Very limited |
| Wilson silt loam, 0 to 1 percent slopes | 7K | 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 55% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 75% 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.