Rock County, Wisconsin
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 Rock County, Wisconsin.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Plano silt loam, gravelly substratum, 0 to 2 percent slopes | 38K | Well drained | B | Somewhat limited | Very limited |
| Kidder silt loam, 2 to 6 percent slopes, eroded | 20K | Well drained | B | Somewhat limited | Very limited |
| Kidder silt loam, 6 to 12 percent slopes, eroded | 18K | Well drained | B | Somewhat limited | Very limited |
| Warsaw silt loam, 0 to 2 percent slopes | 17K | Well drained | B | Somewhat limited | Very limited |
| Sebewa silt loam, 0 to 2 percent slopes | 14K | Poorly drained | B/D | Very limited | Very limited |
| Dresden silt loam, 2 to 6 percent slopes | 14K | Well drained | B | Not limited | Very limited |
| Mahalasville silt loam | 14K | Very poorly drained | B/D | Very limited | Very limited |
| Edmund loam, 6 to 12 percent slopes, eroded | 12K | Well drained | D | Very limited | Very limited |
| St. Charles silt loam, 2 to 6 percent slopes | 11K | Well drained | B | Somewhat limited | Very limited |
| Warsaw silt loam, 2 to 6 percent slopes | 10K | Well drained | B | Somewhat limited | Very limited |
| Durand silt loam, 2 to 6 percent slopes, eroded | 9K | Well drained | B | Somewhat limited | Somewhat limited |
| Elburn silt loam, 0 to 3 percent slopes | 9K | Somewhat poorly drained | C | Very limited | Very limited |
| Pecatonica silt loam, 2 to 6 percent slopes, eroded | 9K | Moderately well drained | B | Somewhat limited | Very limited |
| Ogle silt loam, 2 to 6 percent slopes | 8K | Well drained | B | Somewhat limited | Somewhat limited |
| Rockton loam, 2 to 6 percent slopes | 7K | Well drained | C | Very limited | Very limited |
| Plano silt loam, gravelly substratum, 2 to 6 percent slopes | 7K | Well drained | B | Somewhat limited | Very limited |
| Kane loam, 0 to 3 percent slopes | 7K | Somewhat poorly drained | B | Somewhat limited | Very limited |
| Dresden silt loam, 6 to 12 percent slopes, eroded | 6K | Well drained | B | Somewhat limited | Very limited |
| Plano silt loam, till substratum, 2 to 6 percent slopes | 6K | Well drained | B | Somewhat limited | Very limited |
| Griswold loam, 2 to 6 percent slopes, eroded | 6K | Well drained | B | Not limited | Very limited |
What This Means
Building & Foundations
About 23% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 92% 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.