Coleman County, Texas
The most common soil here is Tarrant, on about 13% of the land: a very cobbly silty clay, smooth and very sticky when wet. Purves and Leeray come next.
About 91% of the land drains well.
USDA rates 97% of the land very limited for a standard septic drain field, and 78% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 7% of the land floods occasionally or more, and bedrock lies within 40 inches under 56% 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 Coleman 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 D (very slow infiltration, high runoff). 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 Coleman 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 |
|---|---|---|---|---|---|
| Tarrant and Purves soils, undulating | 144K | Well drained | D | Very limited | Very limited |
| Leeray clay, 1 to 3 percent slopes | 67K | Well drained | D | Very limited | Very limited |
| Kavett and Talpa soils, undulating | 57K | Well drained | D | Very limited | Very limited |
| Stony land and Owens soils, moderately steep | 52K | D | Very limited | Very limited | |
| Purves and Owens soils, undulating | 48K | Well drained | D | Very limited | Very limited |
| Kavett silty clay, cool, 1 to 3 percent slopes | 41K | Well drained | D | Very limited | Very limited |
| Frio clay loam, frequently flooded | 33K | Well drained | C | Very limited | Very limited |
| Valera clay, 1 to 3 percent slopes | 30K | Well drained | C | Very limited | Very limited |
| Tarrant soils, undulating | 29K | Well drained | D | Very limited | Very limited |
| Speck and Tarrant soils, undulating | 27K | Well drained | D | Very limited | Very limited |
| Sagerton clay loam, warm, 1 to 3 percent slopes | 27K | Well drained | C | Somewhat limited | Very limited |
| Rowena clay loam, 1 to 3 percent slopes | 27K | Well drained | C | Somewhat limited | Very limited |
| Frio clay loam, 0 to 1 percent slopes, occasionally flooded | 23K | Well drained | C | Very limited | Very limited |
| Lindy clay loam, 1 to 3 percent slopes | 18K | Well drained | D | Very limited | Very limited |
| Nukrum clay, 1 to 3 percent slopes | 16K | Well drained | C | Very limited | Very limited |
| Leeray clay, 0 to 1 percent slopes | 15K | Well drained | D | Very limited | Very limited |
| Rowena clay loam, 0 to 1 percent slopes | 15K | Well drained | C | Somewhat limited | Very limited |
| Water | 12K | D | Not rated | Not rated | |
| Cho and Mereta soils, undulating | 12K | Well drained | D | Very limited | Very limited |
| Nuvalde clay loam, cool, 1 to 3 percent slopes | 12K | Well drained | C | Somewhat 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 78% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 97% 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
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.