Dallam County, Texas
The most common soil here is Dallam, on about 32% of the land: a fine sandy loam, gritty and crumbly. Perico and Sunray come next.
About 99% of the land drains well.
USDA rates 19% of the land very limited for a standard septic drain field, and 4% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 2% of the land floods occasionally or more.
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 Dallam County, Texas, 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 Dallam County, Texas. 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 |
|---|---|---|---|---|---|
| Dallam loamy fine sand, 0 to 3 percent slopes | 171K | Well drained | B | Somewhat limited | Somewhat limited |
| Dallam fine sandy loam, 0 to 1 percent slopes | 127K | Well drained | B | Not limited | Somewhat limited |
| Gruver loam, 0 to 1 percent slopes | 80K | Well drained | C | Somewhat limited | Very limited |
| Conlen loam, 0 to 3 percent slopes | 77K | Well drained | B | Not limited | Somewhat limited |
| Sunray loam, 0 to 1 percent slopes | 65K | Well drained | B | Somewhat limited | Somewhat limited |
| Vingo and Dallam loamy fine sands, 0 to 8 percent slopes | 53K | Well drained | A | Not limited | Somewhat limited |
| Sherm clay loam, 0 to 1 percent slopes | 44K | Well drained | C | Somewhat limited | Very limited |
| Perico fine sandy loam, 0 to 1 percent slopes | 42K | Well drained | B | Somewhat limited | Somewhat limited |
| Dumas loam, 0 to 1 percent slopes | 36K | Well drained | B | Somewhat limited | Somewhat limited |
| Dallam fine sandy loam, 1 to 3 percent slopes | 34K | Well drained | B | Not limited | Somewhat limited |
| Perico fine sandy loam, 1 to 3 percent slopes | 31K | Well drained | B | Somewhat limited | Somewhat limited |
| Sunray loam, 1 to 3 percent slopes | 31K | Well drained | B | Somewhat limited | Somewhat limited |
| Spurlock fine sandy loam, 0 to 3 percent slopes | 21K | Well drained | B | Not limited | Somewhat limited |
| Texline loam, dry, 0 to 1 percent slopes | 21K | Well drained | B | Somewhat limited | Somewhat limited |
| Rickmore fine sandy loam, 0 to 1 percent slopes | 19K | Well drained | B | Somewhat limited | Somewhat limited |
| Plack loam, dry, 0 to 3 percent slopes | 17K | Well drained | D | Very limited | Very limited |
| Kerrick-Plack loams, 0 to 1 percent slopes | 11K | Well drained | C | Somewhat limited | Very limited |
| Spurlock soils, 1 to 8 percent slopes, hummocky | 10K | Well drained | B | Not limited | Somewhat limited |
| Berthoud loam, 3 to 5 percent slopes | 8K | Well drained | B | Somewhat limited | Somewhat limited |
| Dumas loam, 1 to 3 percent slopes | 7K | Well drained | B | Somewhat limited | Somewhat 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
Most soils are generally favorable for residential construction. Standard foundations are usually viable, though site-specific evaluation is always recommended.
Septic Systems
Most soils are reasonably suitable for conventional septic systems, though site-specific conditions always matter. Get a perc test to confirm.
Gardening & Agriculture
Drainage is generally favorable for gardening. Adding compost and mulch will improve fertility and water retention. Test your soil's pH before planting — most vegetables prefer 6.0-7.0.