Turner County, South Dakota
The dominant drainage class is Well drained and the dominant hydrologic group is C (slow infiltration, moderate runoff). 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 Turner County, South Dakota.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Egan-Ethan complex, 2 to 6 percent slopes | 54K | Well drained | C | Somewhat limited | Very limited |
| Egan-Trent silty clay loams, 0 to 2 percent slopes | 48K | Well drained | C | Somewhat limited | Very limited |
| Clarno-Crossplain-Davison complex, 0 to 2 percent slopes | 42K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Wentworth-Chancellor-Wakonda silty clay loams, 0 to 2 percent slopes | 30K | Moderately well drained | B | Somewhat limited | Very limited |
| Egan-Wentworth complex, 2 to 6 percent slopes | 28K | Well drained | C | Somewhat limited | Very limited |
| Clarno-Bonilla loams, 0 to 2 percent slopes | 22K | Well drained | B | Not limited | Very limited |
| Clarno-Ethan-Bonilla loams, 1 to 6 percent slopes | 21K | Well drained | B | Not limited | Very limited |
| Clarno-Bonilla loams, 1 to 6 percent slopes | 20K | Well drained | B | Not limited | Very limited |
| Delmont-Enet loams, high precipitation, 0 to 2 percent slopes | 12K | Somewhat excessively drained | B | Not limited | Very limited |
| Ethan-Egan complex, 5 to 9 percent slopes | 10K | Well drained | C | Somewhat limited | Very limited |
| Tetonka silt loam, 0 to 1 percent slopes | 8K | Poorly drained | C/D | Very limited | Very limited |
| Clarno-Ethan-Bonilla loams, 2 to 9 percent slopes | 7K | Well drained | B | Not limited | Very limited |
| Lamo silty clay loam, cool, 0 to 2 percent slopes, occasionally flooded | 7K | Poorly drained | C | Very limited | Very limited |
| Ethan-Betts loams, 9 to 15 percent slopes | 7K | Well drained | C | Somewhat limited | Very limited |
| Clamo silty clay | 7K | Poorly drained | C/D | Very limited | Very limited |
| Bon loam, channeled, 0 to 2 percent slopes, frequently flooded | 7K | Moderately well drained | C | Very limited | Very limited |
| Bon loam, 0 to 2 percent slopes, rarely flooded | 7K | Moderately well drained | C | Very limited | Very limited |
| Chancellor silty clay loam, 0 to 2 percent slopes, frequently flooded | 6K | Poorly drained | C/D | Very limited | Very limited |
| Baltic silty clay loam, 0 to 2 percent slopes, occasionally ponded | 5K | Poorly drained | C/D | Very limited | Very limited |
| Worthing silty clay loam, 0 to 1 percent slopes | 5K | Very poorly drained | C/D | Very limited | Very limited |
What This Means
Building & Foundations
About 26% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 100% 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.