Carroll County, Illinois
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 Carroll County, Illinois.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Osco silt loam, 2 to 5 percent slopes | 43K | Well drained | B | Somewhat limited | Somewhat limited |
| Osco silt loam, 5 to 10 percent slopes, eroded | 19K | Well drained | B | Somewhat limited | Somewhat limited |
| Water | 15K | Not rated | Not rated | ||
| Osco silt loam, 5 to 10 percent slopes | 13K | Well drained | B | Somewhat limited | Somewhat limited |
| Lawson silt loam, cool mesic, 0 to 2 percent slopes, frequently flooded | 13K | Somewhat poorly drained | B/D | Very limited | Very limited |
| Fayette silt loam, 18 to 35 percent slopes, moderately eroded | 9K | Well drained | C | Very limited | Very limited |
| Fayette silt loam, 5 to 10 percent slopes, moderately eroded | 8K | Well drained | C | Somewhat limited | Very limited |
| Dorchester silt loam, 0 to 2 percent slopes, occasionally flooded | 8K | Well drained | B | Very limited | Very limited |
| Fayette silt loam, 10 to 18 percent slopes, moderately eroded | 6K | Well drained | C | Somewhat limited | Very limited |
| Newglarus-Lamoille silt loams, silurian landscape, 18 to 35 percent slopes | 6K | Well drained | C | Very limited | Very limited |
| Fayette silty clay loam, glaciated, 10 to 18 percent slopes, severely eroded | 5K | Well drained | B | Somewhat limited | Somewhat limited |
| Fayette silt loam, glaciated, 10 to 18 percent slopes, eroded | 5K | Well drained | B | Somewhat limited | Somewhat limited |
| Fayette silt loam, glaciated, 5 to 10 percent slopes | 5K | Well drained | B | Somewhat limited | Somewhat limited |
| Seaton-Timula silt loams, 35 to 60 percent slopes, eroded | 5K | Well drained | B | Very limited | Very limited |
| Greenbush silt loam, 2 to 5 percent slopes | 5K | Well drained | B | Somewhat limited | Somewhat limited |
| Fayette silt loam, glaciated, 5 to 10 percent slopes, eroded | 4K | Well drained | B | Somewhat limited | Somewhat limited |
| Sparta loamy sand, 1 to 6 percent slopes | 4K | Excessively drained | A | Not limited | Very limited |
| Greenbush silt loam, 5 to 10 percent slopes, eroded | 4K | Well drained | B | Somewhat limited | Somewhat limited |
| Seaton silt loam, river bluff, 18 to 35 percent slopes, moderately eroded | 4K | Well drained | B | Very limited | Very limited |
| Greenbush silt loam, 5 to 10 percent slopes | 4K | Well drained | B | Somewhat limited | Somewhat 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 33% of soils have significant septic limitations, while others are more suitable. A perc test is essential — conditions vary across the area.
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.