HomeSoil seriesOmulga
Omulga soil series
Omulga soils cover 130,012 mapped acres, almost all of them in Ohio. 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 99%.
It is the leading soil series by area in 13 of the counties and cities on this site.
SSURGO survey versions to August 5, 2026 · series description revised 2021-12
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 Omulga series consists of very deep, moderately well drained soils formed in loess, colluvium, or old alluvium, and in most areas by underlying lacustrine sediments. These soils are on valley fill terraces from valley fills in abandoned preglacial drainage systems in the Allegheny Plateau. Permeability is moderate above the fragipan and slow in the fragipan. Slopes range from 0 to 15 percent. Mean annual precipitation is about 41 inches, and mean annual temperature is about 53 degrees F near the type location.
Source: USDA NRCS series description (OSD) for Omulga, revised 2021-12. Read it.
Engineering properties
| Mapped area (SSURGO) | 130,012 acres |
| Shrink-swell limits houses without basements | 0.0% |
| Shallow water table limits basements | 98.8% |
| Very limited for septic absorption fields | 98.8% |
| Most common drainage class | Moderately well drained |
| Most common hydrologic soil group | C |
| Taxonomic class | Fine-silty, mixed, active, mesic Oxyaquic Fragiudalfs |
| Type location | Scioto County, Ohio |
Where Omulga is mapped
| State | Mapped acres |
|---|---|
| Ohio | 125,723 |
| West Virginia | 4,289 |
Places where Omulga leads
Counties and cities where Omulga covers more mapped land than any other series.
| Place | Share of mapped land |
|---|---|
| Hamden, OH | 64% |
| Wilkesville, OH | 54% |
| Albany, OH | 53% |
| Zaleski, OH | 52% |
| McArthur, OH | 44% |
| Centerville (Thurman), OH | 39% |
| Bergholz, OH | 32% |
| South Webster, OH | 25% |
| Piketon, OH | 25% |
| Wellston, OH | 24% |
| Caldwell, OH | 23% |
| Oak Hill, OH | 23% |
| Jackson, OH | 20% |
Other places where Omulga is a main soil
Counties and cities where Omulga 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
- Beaver, OH 29%
- Cumberland, OH 18%
- Coalton, OH 17%
- Racine, OH 8%
- Waverly, OH 8%
- Rio Grande, OH 8%
- Salineville, OH 6%
- Tiltonsville, OH 5%
- New Concord, OH 5%
- Toronto, OH 5%
- Rayland, OH 4%
- Wellsville, OH 4%
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.