HomeSoil seriesPullman
Pullman soil series
Pullman soils cover 3,074,689 mapped acres, almost all of them in Texas. USDA rates shrink-swell a limit for houses without basements on 100% of that land, and a shallow water table a limit for basements on 0%.
It is the leading soil series by area in 31 of the counties and cities on this site, including Swisher County, TX; Floyd County, TX; Hale County, TX.
SSURGO survey versions to August 5, 2026 · series description revised 2022-09
of its land: shrink-swell limits houses without basements
of its land: a shallow water table limits basements
median highest linear extensibility (6% and up is high)
median highest clay content in the top 150 cm
USDA's description
The Pullman series consists of very deep, well drained, slowly permeable soils that formed in clayey eolian deposits from the Blackwater Draw Formation of Pleistocene age. These soils occur on nearly level to very gently sloping plains or playa slopes. Slope ranges from 0 to 3 percent. The mean annual precipitation is about 483 mm (19 in) and the mean annual temperature is about 16 degrees C (60 degrees F).
Source: USDA NRCS series description (OSD) for Pullman, revised 2022-09. Read it.
Engineering properties
| Mapped area (SSURGO) | 3,074,689 acres |
| Shrink-swell limits houses without basements | 100.0% |
| Shallow water table limits basements | 0.0% |
| Very limited for septic absorption fields | 100.0% |
| Most common drainage class | Well drained |
| Most common hydrologic soil group | C |
| Taxonomic class | Fine, mixed, superactive, thermic Torrertic Paleustolls |
| Type location | Deaf Smith County, Texas |
Where Pullman is mapped
| State | Mapped acres |
|---|---|
| Texas | 3,053,015 |
| New Mexico | 21,674 |
Places where Pullman leads
Counties and cities where Pullman covers more mapped land than any other series.
| Place | Share of mapped land |
|---|---|
| Silverton, TX | 90% |
| Lockney, TX | 87% |
| Floydada, TX | 85% |
| Claude, TX | 84% |
| Kress, TX | 83% |
| Petersburg, TX | 82% |
| Edmonson, TX | 82% |
| Tulia, TX | 80% |
| Ralls, TX | 72% |
| Adrian, TX | 70% |
| Swisher County, TX | 66% |
| Hale Center, TX | 63% |
| Hereford, TX | 62% |
| Floyd County, TX | 62% |
| Happy, TX | 61% |
| Pampa, TX | 60% |
| Plainview, TX | 56% |
| Lorenzo, TX | 53% |
| Hale County, TX | 51% |
| Groom, TX | 46% |
| Deaf Smith County, TX | 45% |
| Castro County, TX | 43% |
| Dimmitt, TX | 41% |
| Randall County, TX | 38% |
| Armstrong County, TX | 31% |
| Nazareth, TX | 30% |
| Amarillo, TX | 29% |
| Briscoe County, TX | 27% |
| Gray County, TX | 25% |
| Carson County, TX | 23% |
| Crosby County, TX | 21% |
Sources
Shares and properties: USDA NRCS SSURGO via Soil Data Access, weighted by each component's share of its map units. Description: the USDA NRCS series description. How we count.