Frederick County, Maryland
The most common soil here is Mt. Airy, on about 6% of the land: a channery silt loam, smooth, like flour. Penn and Myersville come next.
About 80% of the land drains well, and 7% stays wet for long stretches; groundwater comes within two feet of the surface under 16% of it.
USDA rates 75% of the land very limited for a standard septic drain field, and 60% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 6% of the land floods occasionally or more, and bedrock lies within 40 inches under 52% 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 Frederick County, Maryland, 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 B (moderate infiltration). The most common soil order is Alfisols — moderately leached forest soils with a clay-enriched subsoil. 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 Frederick County, Maryland. 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 |
|---|---|---|---|---|---|
| Mt. Airy channery loam, 8 to 15 percent slopes | 20K | Well drained | C | Very limited | Very limited |
| Glenelg-Mt. Airy channery loams, 3 to 8 percent slopes | 14K | Well drained | B | Very limited | Very limited |
| Brinklow-Blocktown channery loams, 15 to 25 percent slopes | 13K | Well drained | C | Very limited | Very limited |
| Penn silt loam, 3 to 8 percent slopes | 11K | Well drained | B | Very limited | Very limited |
| Stumptown-Bagtown-Rock outcrop complex, 25 to 65 percent slopes | 10K | Well drained | B | Very limited | Very limited |
| Duffield-Ryder silt loams, 3 to 8 percent slopes | 9K | Well drained | B | Somewhat limited | Somewhat limited |
| Myersville silt loam, 3 to 8 percent slopes | 9K | Well drained | B | Not limited | Somewhat limited |
| Myersville-Burkittsville complex, 3 to 8 percent slopes | 9K | Well drained | B | Not limited | Somewhat limited |
| Penn-Reaville silt loams, 3 to 8 percent slopes | 9K | Well drained | B | Very limited | Very limited |
| Ravenrock-Highfield-Rock outcrop complex, 25 to 65 percent slopes | 8K | Well drained | C | Very limited | Very limited |
| Linganore-Hyattstown channery silt loams, 3 to 8 percent slopes | 7K | Well drained | C | Somewhat limited | Very limited |
| Codorus and Hatboro silt loams, 0 to 3 percent slopes | 6K | Moderately well drained | C | Very limited | Very limited |
| Linganore-Hyattstown channery silt loams, 8 to 15 percent slopes | 6K | Well drained | C | Somewhat limited | Very limited |
| Penn channery loam, 3 to 8 percent slopes | 6K | Well drained | B | Very limited | Very limited |
| Spoolsville-Burkittsville complex, 8 to 15 percent slopes | 6K | Well drained | B | Somewhat limited | Somewhat limited |
| Ravenrock-Highfield-Rock outcrop complex, 15 to 25 percent slopes | 6K | Well drained | C | Very limited | Very limited |
| Myersville silt loam, 8 to 15 percent slopes | 5K | Well drained | B | Somewhat limited | Somewhat limited |
| Croton-Abbottstown silt loams, 3 to 8 percent slopes | 5K | Somewhat poorly drained | D | Very limited | Very limited |
| Catoctin-Spoolsville complex, 15 to 25 percent slopes | 5K | Well drained | B | Very limited | Very limited |
| Rohrersville-Lantz silt loams, 0 to 8 percent slopes | 5K | Somewhat poorly drained | C/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 60% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 75% 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.