Union County, North Carolina
The most common soil here is Badin, on about 27% of the land: a channery silt loam, smooth, like flour. Tarrus and Cid come next.
About 72% of the land drains well, and 5% stays wet for long stretches; groundwater comes within two feet of the surface under 8% of it.
USDA rates 72% of the land very limited for a standard septic drain field, and 45% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 5% of the land floods occasionally or more, and bedrock lies within 40 inches under 64% of it.
Soils change over short distances, so look up an address below for the soil at that exact spot and the reasons behind each rating.
The soils you're most likely standing on
The biggest named soils in Union County, North Carolina, each drawn five feet deep from its official USDA description, in its recorded colors.
Dots mark gravel; white flecks mark lime. Shares are by acres across the survey area, and each mapped patch usually mixes several of these soils.
The biggest mapped areas
The dominant drainage class is Well drained and the dominant hydrologic group is D (very slow infiltration, high runoff). The most common soil order is Ultisols — strongly weathered soils with clay-enriched subsoils, common in warm humid climates. 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, North Carolina. Search your address to find the exact soil composition, drainage, and series details at your specific location.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Cid channery silt loam, 1 to 5 percent slopes | 70K | Moderately well drained | D | Very limited | Very limited |
| Badin channery silt loam, 2 to 8 percent slopes | 54K | Well drained | C | Somewhat limited | Very limited |
| Tarrus gravelly silty clay loam, 2 to 8 percent slopes, moderately eroded | 49K | Well drained | B | Not limited | Somewhat limited |
| Goldston-Badin complex, 2 to 8 percent slopes | 31K | Well drained | D | Very limited | Very limited |
| Badin channery silty clay loam, 2 to 8 percent slopes, moderately eroded | 30K | Well drained | C | Somewhat limited | Very limited |
| Chewacla silt loam, 0 to 2 percent slopes, frequently flooded | 21K | Somewhat poorly drained | B/D | Very limited | Very limited |
| Tarrus gravelly silt loam, 2 to 8 percent slopes | 20K | Well drained | B | Not limited | Somewhat limited |
| Cecil gravelly sandy clay loam, 2 to 8 percent slopes, moderately eroded | 14K | Well drained | B | Not limited | Somewhat limited |
| Goldston-Badin complex, 8 to 15 percent slopes | 13K | Well drained | D | Very limited | Very limited |
| Goldston very channery silt loam, 4 to 15 percent slopes | 10K | Well drained | D | Very limited | Very limited |
| Secrest-Cid complex, 0 to 3 percent slopes | 10K | Moderately well drained | C | Very limited | Very limited |
| Badin channery silt loam, 8 to 15 percent slopes | 9K | Well drained | C | Somewhat limited | Very limited |
| Badin-Urban land complex, 2 to 8 percent slopes | 8K | Well drained | C | Somewhat limited | Very limited |
| Tarrus gravelly silty clay loam, 8 to 15 percent slopes, moderately eroded | 7K | Well drained | B | Somewhat limited | Somewhat limited |
| Badin channery silty clay loam, 8 to 15 percent slopes, moderately eroded | 6K | Well drained | C | Somewhat limited | Very limited |
| Misenheimer-Cid complex, 0 to 3 percent slopes | 5K | Moderately well drained | C/D | Very limited | Very limited |
| Georgeville silty clay loam, 2 to 8 percent slopes, moderately eroded | 5K | Well drained | B | Not limited | Somewhat limited |
| Goldston very channery silt loam, 15 to 45 percent slopes | 5K | Well drained | D | Very limited | Very limited |
| Cecil gravelly sandy clay loam, 8 to 15 percent slopes, moderately eroded | 5K | Well drained | B | Somewhat limited | Somewhat limited |
| Wynott gravelly loam, 2 to 8 percent slopes | 4K | Well drained | D | Very limited | Very limited |
Soil Orders in This Area
The USDA classifies every soil into one of 12 soil orders. Here are the dominant orders found in this survey area.
What This Means
Building & Foundations
About 45% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 72% 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.