Union County, Illinois

Survey Area IL181 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 Union County, Illinois.

Soil Map UnitAcresDrainageHydro GroupDwellingsSeptic
Wakeland silt loam, 0 to 2 percent slopes, occasionally flooded 15K Somewhat poorly drainedB/DVery limitedVery limited
Hosmer silt loam, 5 to 10 percent slopes, severely eroded 15K Moderately well drainedCSomewhat limitedVery limited
Hosmer silt loam, 2 to 5 percent slopes 14K Moderately well drainedCSomewhat limitedVery limited
Menfro-Clarksville complex, 18 to 35 percent slopes 14K Well drainedBVery limitedVery limited
Hosmer silt loam, 5 to 10 percent slopes, eroded 14K Moderately well drainedCSomewhat limitedVery limited
Hosmer silt loam, 10 to 18 percent slopes, severely eroded 12K Moderately well drainedCSomewhat limitedVery limited
Menfro silt loam, 10 to 18 percent slopes, severely eroded 12K Well drainedBSomewhat limitedSomewhat limited
Menfro silt loam, 5 to 10 percent slopes, eroded 9K Well drainedBSomewhat limitedSomewhat limited
Haymond silt loam, 0 to 3 percent slopes, occasionally flooded 9K Well drainedBVery limitedVery limited
Hosmer silt loam, 10 to 18 percent slopes, eroded 9K Moderately well drainedCSomewhat limitedVery limited
Menfro silt loam, 10 to 18 percent slopes, eroded 8K Well drainedBSomewhat limitedSomewhat limited
Zanesville-Westmore silt loams, 10 to 18 percent slopes, eroded 8K Well drainedDSomewhat limitedVery limited
Clarksville-Menfro complex, 35 to 70 percent slopes 8K Somewhat excessively drainedBVery limitedVery limited
Wellston-Westmore silt loams, 18 to 35 percent slopes 7K Well drainedBVery limitedVery limited
Menfro silt loam, 2 to 5 percent slopes 7K Well drainedCSomewhat limitedSomewhat limited
Water 6K Not ratedNot rated
Menfro silt loam, 5 to 10 percent slopes, severely eroded 6K Well drainedBSomewhat limitedSomewhat limited
Menfro-Goss complex, 18 to 35 percent slopes 5K Well drainedBVery limitedVery limited
Winfield silt loam, 5 to 10 percent slopes, eroded 5K Moderately well drainedCSomewhat limitedVery limited
Elsah silt loam, 1 to 4 percent slopes, occasionally flooded 5K Well drainedBVery limitedVery limited

What This Means

Building & Foundations

About 33% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.

Septic Systems

About 74% 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.

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