Jefferson County, Tennessee
The dominant drainage class is Well drained and the dominant hydrologic group is B (moderate infiltration). 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 Jefferson County, Tennessee.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Water | 24K | Not rated | Not rated | ||
| Dewey-Collegedale complex, 6 to 15 percent slopes, moderately eroded | 13K | Well drained | B | Somewhat limited | Somewhat limited |
| Dandridge channery silt loam, 25 to 70 percent slopes, eroded | 12K | Excessively drained | D | Very limited | Very limited |
| Dewey-Collegedale complex, 15 to 25 percent slopes, severely eroded | 9K | Well drained | B | Very limited | Very limited |
| Collegedale-Talbott-Rock outcrop complex, 5 to 20 percent slopes, eroded | 8K | Well drained | C | Somewhat limited | Very limited |
| Dewey-Etowah complex, karst, 2 to 30 percent slopes, moderately eroded | 7K | Well drained | B | Very limited | Very limited |
| Fullerton gravelly silt loam, 12 to 25 percent slopes, eroded | 7K | Well drained | B | Very limited | Very limited |
| Dewey-Collegedale complex, 15 to 25 percent slopes, moderately eroded | 6K | Well drained | B | Very limited | Very limited |
| Dewey silt loam, 6 to 15 percent slopes, eroded | 6K | Well drained | B | Somewhat limited | Somewhat limited |
| Collegedale-Talbott-Rock outcrop complex, 20 to 35 percent slopes, eroded | 5K | Well drained | C | Very limited | Very limited |
| Dandridge channery silty clay loam, 25 to 50 percent slopes, severely eroded | 5K | Excessively drained | D | Very limited | Very limited |
| Talbott-Rock outcrop complex, karst, 10 to 35 percent slopes, eroded | 4K | Well drained | C | Very limited | Very limited |
| Dewey-Collegedale complex, 6 to 15 percent slopes, severely eroded | 4K | Well drained | B | Somewhat limited | Somewhat limited |
| Fullerton gravelly silt loam, 5 to 12 percent slopes, eroded | 4K | Well drained | B | Somewhat limited | Somewhat limited |
| Lindside silt loam, 0 to 3 percent slopes, occasionally flooded, warm | 4K | Moderately well drained | C | Very limited | Very limited |
| Dandridge channery silty clay loam, 10 to 25 percent slopes, severely eroded | 4K | Excessively drained | D | Very limited | Very limited |
| Dewey silty clay loam, 6 to 15 percent slopes, severely eroded | 3K | Well drained | B | Somewhat limited | Somewhat limited |
| Dewey silty clay loam, 15 to 25 percent slopes, severely eroded | 3K | Well drained | B | Very limited | Very limited |
| Fullerton gravelly silt loam, 25 to 45 percent slopes, eroded | 3K | Well drained | B | Very limited | Very limited |
| Sequoia silt loam, 5 to 12 percent slopes, eroded | 3K | Well drained | C | Somewhat limited | Very limited |
What This Means
Building & Foundations
About 51% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 59% 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.