Marshall 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 Marshall County, South Dakota.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Forman-Aastad loams, 9 to 15 percent slopes | 47K | Well drained | C | Somewhat limited | Very limited |
| Forman-Aastad loams, 6 to 9 percent slopes | 37K | Well drained | C | Somewhat limited | Very limited |
| Forman-Aastad loams, 1 to 6 percent slopes | 27K | Well drained | C | Somewhat limited | Very limited |
| Beotia silt loam, 0 to 2 percent slopes | 25K | Well drained | B | Somewhat limited | Somewhat limited |
| Harmony-Aberdeen silty clay loams, 0 to 2 percent slopes | 23K | Moderately well drained | C | Somewhat limited | Very limited |
| Water | 20K | Not rated | Not rated | ||
| Southam silty clay loam, 0 to 1 percent slopes | 20K | Very poorly drained | C/D | Very limited | Very limited |
| Beotia-Bearden silt loams, 0 to 2 percent slopes | 18K | Well drained | B | Somewhat limited | Very limited |
| Forman-Buse loams, 15 to 25 percent slopes | 18K | Well drained | C | Very limited | Very limited |
| Nahon-Aberdeen-Exline silt loams, 0 to 2 percent slopes | 14K | Moderately well drained | C | Somewhat limited | Very limited |
| Kranzburg-Brookings silt loams, 0 to 2 percent slopes | 13K | Well drained | C | Somewhat limited | Very limited |
| Buse-Forman loams, 9 to 21 percent slopes | 10K | Well drained | C | Very limited | Very limited |
| Poinsett-Forman complex, 2 to 6 percent slopes | 9K | Well drained | C | Somewhat limited | Very limited |
| Forman-Poinsett complex, 6 to 9 percent slopes | 9K | Well drained | C | Somewhat limited | Very limited |
| Ulen fine sandy loam, 0 to 2 percent slopes | 9K | Somewhat poorly drained | B | Somewhat limited | Very limited |
| Bearden silt loam, 0 to 2 percent slopes | 9K | Somewhat poorly drained | C | Very limited | Very limited |
| Kranzburg-Brookings silt loams, 2 to 6 percent slopes | 8K | Well drained | C | Somewhat limited | Very limited |
| Forman-Poinsett complex, 9 to 15 percent slopes | 8K | Well drained | C | Somewhat limited | Very limited |
| Exline-Aberdeen-Nahon silt loams, 0 to 2 percent slopes | 6K | Somewhat poorly drained | D | Very limited | Very limited |
| Peever clay loam, 2 to 6 percent slopes | 6K | Well drained | C | Somewhat limited | Very limited |
What This Means
Building & Foundations
Most soils are generally favorable for residential construction. Standard foundations are usually viable, though site-specific evaluation is always recommended.
Septic Systems
About 86% 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.