Marion and Monongalia Counties, West Virginia
The most common soil here is Culleoka, on about 18% of the land: a silt loam, smooth, like flour. Gilpin and Westmoreland come next.
About 73% of the land drains well; groundwater comes within two feet of the surface under 18% of it.
USDA rates 94% of the land very limited for a standard septic drain field, and 92% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 4% of the land floods occasionally or more, and bedrock lies within 40 inches under 63% 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 Marion and Monongalia Counties, West Virginia, 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 C (slow infiltration, moderate runoff). The most common soil order is Entisols — young soils with little profile development, often on floodplains or steep slopes. 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 Marion and Monongalia Counties, West Virginia. 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 |
|---|---|---|---|---|---|
| Gilpin-Culleoka-Upshur silt loams, 35 to 65 percent slopes | 70K | Well drained | C | Very limited | Very limited |
| Culleoka-Westmoreland silt loams, 25 to 35 percent slopes | 35K | Well drained | B | Very limited | Very limited |
| Gilpin-Culleoka-Upshur silt loams, 25 to 35 percent slopes | 27K | Well drained | C | Very limited | Very limited |
| Culleoka-Westmoreland silt loams, 35 to 65 percent slopes | 23K | Well drained | B | Very limited | Very limited |
| Clarksburg silt loam, 15 to 25 percent slopes | 23K | Moderately well drained | C/D | Very limited | Very limited |
| Culleoka-Westmoreland silt loams, 15 to 25 percent slopes | 22K | Well drained | B | Very limited | Very limited |
| Gilpin-Culleoka-Upshur silt loams, 15 to 25 percent slopes | 16K | Well drained | C | Very limited | Very limited |
| Clarksburg silt loam, 8 to 15 percent slopes | 14K | Moderately well drained | C/D | Very limited | Very limited |
| Dormont and Guernsey silt loams, 15 to 25 percent slopes | 12K | Moderately well drained | C | Very limited | Very limited |
| Dekalb very stony loam, 35 to 65 percent slopes | 12K | Well drained | A | Very limited | Very limited |
| Dekalb very stony loam, 15 to 35 percent slopes | 9K | Well drained | A | Very limited | Very limited |
| Lobdell-Holly silt loams | 8K | Moderately well drained | C | Very limited | Very limited |
| Dormont and Guernsey silt loams, 8 to 15 percent slopes | 8K | Moderately well drained | C | Somewhat limited | Very limited |
| Westmoreland silt loam, 25 to 35 percent slopes | 8K | Well drained | B | Very limited | Very limited |
| Gilpin silt loam, 25 to 35 percent slopes | 7K | Well drained | C | Very limited | Very limited |
| Culleoka-Westmoreland silt loams, 8 to 15 percent slopes | 7K | Well drained | B | Very limited | Very limited |
| Westmoreland silt loam, 15 to 25 percent slopes | 7K | Well drained | B | Very limited | Very limited |
| Gilpin silt loam, 15 to 25 percent slopes | 6K | Well drained | C | Very limited | Very limited |
| Udorthents, cut and fill | 6K | Not rated | Not rated | ||
| Water | 6K | Not rated | Not rated |
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 92% of soils are rated "very limited" for dwellings with basements. Specific challenges include steep slopes, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 94% 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.