HomeSoil seriesPewamo
Pewamo soil series
Pewamo soils cover 1,863,812 mapped acres, mostly in Ohio, Indiana and Michigan. USDA rates shrink-swell a limit for houses without basements on 85% of that land, and a shallow water table a limit for basements on 99%.
It is the leading soil series by area in 16 of the counties and cities on this site, including Grant County, IN; Wells County, IN; Van Wert County, OH.
SSURGO survey versions to August 5, 2026 · series description revised 2021-11
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 Pewamo series consists of very deep, very poorly drained soils formed in till on moraines, near-shore zones (relict), and lake plains. Slope ranges from 0 to 2 percent. Mean annual precipitation is about 838 mm (33 inches), and mean annual temperature is about 9.4 degrees C (49 degrees F).
Source: USDA NRCS series description (OSD) for Pewamo, revised 2021-11. Read it.
Engineering properties
| Mapped area (SSURGO) | 1,863,812 acres |
| Shrink-swell limits houses without basements | 85.5% |
| Shallow water table limits basements | 99.4% |
| Very limited for septic absorption fields | 99.4% |
| Most common drainage class | Very poorly drained |
| Most common hydrologic soil group | C/D |
| Taxonomic class | Fine, mixed, active, mesic Typic Argiaquolls |
| Type location | Washtenaw County, Michigan |
Where Pewamo is mapped
| State | Mapped acres |
|---|---|
| Ohio | 928,901 |
| Indiana | 762,480 |
| Michigan | 168,907 |
| Wisconsin | 3,524 |
Places where Pewamo leads
Counties and cities where Pewamo covers more mapped land than any other series.
| Place | Share of mapped land |
|---|---|
| Ohio City, OH | 58% |
| Ridgeway, OH | 41% |
| Grant County, IN | 36% |
| Monroeville, OH | 36% |
| Hebron, OH | 32% |
| Wells County, IN | 28% |
| Van Wert County, OH | 27% |
| Delaware County, OH | 22% |
| Lyons, OH | 19% |
| Delaware County, IN | 17% |
| Findlay, OH | 15% |
| Bellevue, OH | 14% |
| Monroe County, MI | 14% |
| Randolph County, IN | 13% |
| Marion, OH | 12% |
| Erie County, OH | 7% |
Other places where Pewamo is a main soil
Counties and cities where Pewamo is among the six soil series covering the most mapped land, but not the first. Share of the place's mapped land.
Counties
- Adams County, IN 34%
- Mercer County, OH 28%
- Huntington County, IN 28%
- Hardin County, OH 26%
- Allen County, OH 25%
- Hancock County, OH 24%
- Auglaize County, OH 23%
- Blackford County, IN 22%
- Jay County, IN 21%
- Marion County, OH 20%
- DeKalb County, IN 19%
- Shelby County, OH 18%
- Allen County, IN 17%
- Miami County, IN 14%
- Wyandot County, OH 13%
- Whitley County, IN 12%
- Union County, OH 12%
- Crawford County, OH 11%
- Howard County, IN 10%
- Lake County, IN 9%
- Williams County, OH 9%
- Morrow County, OH 9%
- Darke County, OH 8%
- Licking County, OH 7%
- Lenawee County, MI 6%
- Huron County, OH 6%
- Wabash County, IN 6%
- Madison County, IN 6%
- Wayne County, MI 5%
- Fairfield County, OH 3%
Texas and Ohio cities
- Ada, OH 41%
- Arlington, OH 36%
- Rawson, OH 34%
- Alger, OH 32%
- Osgood, OH 32%
- Mount Cory, OH 32%
- Convoy, OH 32%
- Wharton, OH 31%
- Minster, OH 31%
- Carey, OH 30%
- Vanlue, OH 30%
- Fort Loramie, OH 29%
- Russia, OH 29%
- Jackson Center, OH 28%
- Arcadia, OH 28%
- Spencerville, OH 28%
- Coldwater, OH 28%
- New Albany, OH 28%
- New Knoxville, OH 26%
- New Bremen, OH 25%
- Ashley, OH 24%
- Harrod, OH 24%
- Pataskala, OH 23%
- St. Henry, OH 23%
- Rockford, OH 23%
- Delaware, OH 22%
- Wauseon, OH 22%
- Cridersville, OH 22%
- Forest, OH 21%
- Anna, OH 21%
- Waldo, OH 21%
- Rossburg, OH 20%
- Cairo, OH 20%
- Benton Ridge, OH 20%
- Celina, OH 20%
- Mount Victory, OH 20%
- Waynesfield, OH 20%
- Bluffton, OH 19%
- Chickasaw, OH 18%
- Marysville, OH 17%
- Van Wert, OH 17%
- Botkins, OH 17%
- Versailles, OH 17%
- Elida, OH 16%
- Buckeye Lake, OH 16%
- Wapakoneta, OH 16%
- Sunbury, OH 16%
- Mendon, OH 15%
- Beaverdam, OH 15%
- Union City, OH 14%
- Dunkirk, OH 14%
- Shelby, OH 14%
- Lafayette, OH 14%
- Nevada, OH 13%
- Willshire, OH 13%
- Buckland, OH 13%
- Pioneer, OH 13%
- Edison, OH 13%
- Powell, OH 13%
- Shiloh, OH 12%
- Fort Recovery, OH 12%
- Cardington, OH 12%
- Crestline, OH 11%
- Lima, OH 11%
- Kenton, OH 11%
- Magnetic Springs, OH 11%
- Centerburg, OH 11%
- St. Marys, OH 10%
- McComb, OH 10%
- Bucyrus, OH 10%
- Montpelier, OH 10%
- Caledonia, OH 9%
- Pickerington, OH 9%
- Galena, OH 9%
- Edon, OH 9%
- Fayette, OH 9%
- Jenera, OH 8%
- Johnstown, OH 8%
- Kirkersville, OH 8%
- New Washington, OH 8%
- Tiro, OH 8%
- Westerville, OH 7%
- Gahanna, OH 7%
- Republic, OH 7%
- Harpster, OH 7%
- Mount Blanchard, OH 7%
- West Mansfield, OH 7%
- Fostoria, OH 7%
- Shawnee Hills, OH 7%
- Worthington, OH 6%
- Sidney, OH 6%
- Reynoldsburg, OH 6%
- Edgerton, OH 6%
- Middle Point, OH 5%
- Richwood, OH 5%
- Millersport, OH 5%
- Riverlea, OH 5%
- Hartford (Croton), OH 5%
- New Riegel, OH 5%
- Galion, OH 5%
- New Bloomington, OH 4%
- Ostrander, OH 4%
- Columbus, OH 4%
- Kelleys Island, OH 4%
- Willard, OH 4%
- Stryker, OH 3%
- Thornville, OH 3%
- Attica, OH 2%
- Whitehall, OH 2%
- Utica, OH 2%
- Minerva Park, OH 1%
- North Robinson, OH 1%
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.