Johnson County, Tennessee
The most common soil here is Keener, on about 14% of the land: a gravelly fine sandy loam, gritty and crumbly. Ditney and Unicoi come next.
About 97% of the land drains well.
USDA rates 97% of the land very limited for a standard septic drain field, and 92% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 2% of the land floods occasionally or more, and bedrock lies within 40 inches under 51% 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 Johnson County, Tennessee, 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 B (moderate infiltration). 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 Johnson County, Tennessee. 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 |
|---|---|---|---|---|---|
| Unicoi-Rock outcrop complex, 50 to 80 percent slopes | 24K | Somewhat excessively drained | D | Very limited | Very limited |
| Ditney sandy loam, 35 to 50 percent slopes | 15K | Well drained | B | Very limited | Very limited |
| Keener loam, 20 to 35 percent slopes | 9K | Well drained | B | Very limited | Very limited |
| Lonon loam, 12 to 20 percent slopes | 9K | Well drained | B | Very limited | Very limited |
| Keener loam, 35 to 50 percent slopes | 9K | Well drained | B | Very limited | Very limited |
| Ditney sandy loam, 20 to 35 percent slopes | 8K | Well drained | B | Very limited | Very limited |
| Lonon loam, 20 to 35 percent slopes | 6K | Well drained | B | Very limited | Very limited |
| Maymead loam, 35 to 50 percent slopes | 6K | Well drained | A | Very limited | Very limited |
| Ashe gravelly fine sandy loam, 25 to 65 percent slopes | 6K | Somewhat excessively drained | B | Very limited | Very limited |
| Northcove very stony sandy loam, 50 to 80 percent slopes | 6K | Well drained | B | Very limited | Very limited |
| Keener loam, 12 to 20 percent slopes | 5K | Well drained | B | Very limited | Very limited |
| Calvin channery silt loam, 12 to 20 percent slopes | 5K | Well drained | B | Very limited | Very limited |
| Calvin channery silt loam, 35 to 50 percent slopes | 5K | Well drained | B | Very limited | Very limited |
| Ditney sandy loam, 50 to 80 percent slopes | 5K | Well drained | B | Very limited | Very limited |
| Calvin channery silt loam, 20 to 35 percent slopes | 5K | Well drained | B | Very limited | Very limited |
| Soco fine sandy loam, 35 to 50 percent slopes | 4K | Well drained | B | Very limited | Very limited |
| Ashe gravelly fine sandy loam, 12 to 25 percent slopes | 4K | Somewhat excessively drained | B | Very limited | Very limited |
| Northcove very stony sandy loam, 35 to 50 percent slopes | 4K | Well drained | B | Very limited | Very limited |
| Shelocta silt loam, 12 to 20 percent slopes | 3K | Well drained | B | Very limited | Very limited |
| Cataska channery silt loam, 35 to 50 percent slopes | 3K | Excessively 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 92% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes. A geotechnical assessment is recommended before building.
Septic Systems
About 97% 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
Well-drained soils on sloped terrain — good for most plants but watch for erosion. Terracing, contour planting, and mulching help retain moisture and topsoil. Drip irrigation is more effective than sprinklers on slopes.