Asa soil series
Asa soils cover 103,818 mapped acres, almost all of them in Texas. USDA rates shrink-swell a limit for houses without basements on 0% of that land, and a shallow water table a limit for basements on 0%.
It is the leading soil series by area in 7 of the counties and cities on this site.
SSURGO survey versions to August 5, 2026 · series description revised 2018-02
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 Asa series consists of very deep, well drained, soils formed in loamy alluvium. These nearly level to very gently sloping soils are on flood plains. Slopes range from 0 to 3 percent. Mean annual precipitation is about 1143 mm (45 in) and the mean annual air temperature is about 20.6 degrees C (69 degrees F).
Source: USDA NRCS series description (OSD) for Asa, revised 2018-02. Read it.
Engineering properties
| Mapped area (SSURGO) | 103,818 acres |
| Shrink-swell limits houses without basements | 0.0% |
| Shallow water table limits basements | 0.0% |
| Very limited for septic absorption fields | 5.2% |
| Most common drainage class | Well drained |
| Most common hydrologic soil group | B |
| Taxonomic class | Fine-silty, mixed, superactive, hyperthermic Fluventic Hapludolls |
| Type location | Wharton County, Texas |
Where Asa is mapped
| State | Mapped acres |
|---|---|
| Texas | 103,818 |
Places where Asa leads
Counties and cities where Asa covers more mapped land than any other series.
| Place | Share of mapped land |
|---|---|
| Jones Creek, TX | 80% |
| Brazoria, TX | 56% |
| Sweeny, TX | 37% |
| West Columbia, TX | 35% |
| Holiday Lakes, TX | 32% |
| Oyster Creek, TX | 25% |
| Clute, TX | 21% |
Other places where Asa is a main soil
Counties and cities where Asa is among the six soil series covering the most mapped land, but not the first. Share of the place's mapped land.
Counties
Texas and Ohio cities
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.