Iowa Soil Data
Soil data for 99 counties
The most common soil order across Iowa's 99 counties is Mollisols. County-level average pH ranges from 6.1 to 7.1, reflecting the state's diverse geology and land use. Approximately 12% of counties report poor or very poor drainage as the dominant class, which can affect crop selection and land management decisions.
Counties in Iowa
| County | Dominant Texture | Avg pH | Drainage | Soil Order |
|---|---|---|---|---|
| Adair County | Silty Clay Loam | 6.3 | N/A | N/A |
| Adams County | Silty Clay Loam | 6.3 | N/A | N/A |
| Allamakee County | Silt Loam | 6.5 | N/A | N/A |
| Appanoose County | Silt Loam | 6.1 | N/A | N/A |
| Audubon County | Silty clay loam | 6.2 | Well drained | Mollisols |
| Benton County | Loam | 6.3 | Well drained | Alfisols |
| Black Hawk County | Loam | 6.3 | N/A | N/A |
| Boone County | Loam | 6.7 | N/A | N/A |
| Bremer County | Loam | 6.3 | N/A | N/A |
| Buchanan County | Silt loam | 6.3 | Well drained | Alfisols |
| Buena Vista County | Clay Loam | 6.7 | N/A | N/A |
| Butler County | Loam | 6.3 | N/A | N/A |
| Calhoun County | Loam | 6.8 | N/A | N/A |
| Carroll County | Loam | 6.5 | N/A | N/A |
| Cass County | Silty Clay Loam | 6.2 | N/A | N/A |
| Cedar County | Silt Loam | 6.2 | N/A | N/A |
| Cerro Gordo County | Loam | 6.7 | N/A | N/A |
| Cherokee County | Loam | 6.5 | N/A | N/A |
| Chickasaw County | Loamy fine sand | 6.2 | Excessively drained | Entisols |
| Clarke County | Silty clay loam | 6.2 | Poorly drained | Alfisols |
| Clay County | Loam | 6.5 | N/A | N/A |
| Clayton County | Loam | 6.4 | Poorly drained | Mollisols |
| Clinton County | Silt loam | 6.3 | Well drained | Alfisols |
| Crawford County | Silt Loam | 6.4 | N/A | N/A |
| Dallas County | Loam | 6.6 | N/A | N/A |
| Davis County | Silt Loam | 6.2 | N/A | N/A |
| Decatur County | Silt Loam | 6.2 | N/A | N/A |
| Delaware County | Silt loam | 6.3 | Well drained | Alfisols |
| Des Moines County | Silt Loam | 6.3 | N/A | N/A |
| Dickinson County | Loam | 6.8 | N/A | N/A |
| Dubuque County | Loamy fine sand | 6.4 | Excessively drained | Entisols |
| Emmet County | Loam | 6.7 | N/A | N/A |
| Fayette County | Loam | 6.4 | N/A | N/A |
| Floyd County | Loam | 6.6 | Well drained | Mollisols |
| Franklin County | Silt loam | 6.7 | Well drained | Mollisols |
| Fremont County | Silty clay | 6.8 | Poorly drained | Mollisols |
| Greene County | Loam | 6.8 | N/A | N/A |
| Grundy County | Loam | 6.3 | N/A | N/A |
| Guthrie County | Loamy sand | 6.2 | Excessively drained | Alfisols |
| Hamilton County | Loam | 6.6 | N/A | N/A |
| Hancock County | Loam | 6.7 | N/A | N/A |
| Hardin County | Loam | 6.6 | N/A | N/A |
| Harrison County | Silt Loam | 7.1 | N/A | N/A |
| Henry County | Silt Loam | 6.2 | N/A | N/A |
| Howard County | Sandy loam | 6.2 | Somewhat excessively drained | Mollisols |
| Humboldt County | Loam | 6.6 | N/A | N/A |
| Ida County | Silty clay loam | 6.3 | Well drained | Mollisols |
| Iowa County | Silt Loam | 6.3 | N/A | N/A |
| Jackson County | Silt loam | 6.4 | Well drained | Mollisols |
| Jasper County | Silt Loam | 6.3 | N/A | N/A |
| Jefferson County | Silt Loam | 6.2 | N/A | N/A |
| Johnson County | Loam | 6.3 | Moderately well drained | Entisols |
| Jones County | Sandy loam | 6.4 | Well drained | Alfisols |
| Keokuk County | Silt Loam | 6.3 | N/A | N/A |
| Kossuth County | Loam | 6.7 | N/A | N/A |
| Lee County | Silt loam | 6.1 | Poorly drained | Alfisols |
| Linn County | Silt loam | 6.3 | Well drained | Alfisols |
| Louisa County | Silt Loam | 6.3 | N/A | N/A |
| Lucas County | Silty Clay Loam | 6.1 | N/A | N/A |
| Lyon County | Clay Loam | 6.7 | N/A | N/A |
| Madison County | Loam | 6.3 | Somewhat poorly drained | Alfisols |
| Mahaska County | Silt Loam | 6.3 | N/A | N/A |
| Marion County | Silt loam | 6.2 | Poorly drained | Alfisols |
| Marshall County | Loam | 6.4 | Moderately well drained | Mollisols |
| Mills County | Silty clay loam | 6.8 | Poorly drained | Mollisols |
| Mitchell County | Loam | 6.3 | Moderately well drained | Mollisols |
| Monona County | Silt loam | 6.8 | Moderately well drained | Entisols |
| Monroe County | Silt Loam | 6.2 | N/A | N/A |
| Montgomery County | Silty clay loam | 6.3 | Well drained | Mollisols |
| Muscatine County | Silt loam | 6.2 | Well drained | Alfisols |
| O'Brien County | Loam | 6.7 | N/A | N/A |
| Osceola County | Clay Loam | 6.7 | N/A | N/A |
| Page County | Silty Clay Loam | 6.3 | N/A | N/A |
| Palo Alto County | Fine sandy loam | 6.7 | Well drained | Mollisols |
| Plymouth County | Silt Loam | 6.9 | N/A | N/A |
| Pocahontas County | Loam | 6.9 | N/A | N/A |
| Polk County | Loam | 6.4 | N/A | N/A |
| Pottawattamie County | Silty clay loam | 6.8 | Poorly drained | Mollisols |
| Poweshiek County | Silt Loam | 6.3 | N/A | N/A |
| Ringgold County | Silt loam | 6.3 | Poorly drained | Mollisols |
| Sac County | Loam | 6.5 | N/A | N/A |
| Scott County | Loam | 6.4 | Moderately well drained | Mollisols |
| Shelby County | Silty Clay Loam | 6.3 | N/A | N/A |
| Sioux County | Silt Loam | 6.6 | N/A | N/A |
| Story County | Loam | 6.7 | N/A | N/A |
| Tama County | Loam | 6.3 | Moderately well drained | Entisols |
| Taylor County | Loam | 6.2 | Somewhat poorly drained | Alfisols |
| Union County | Silt Loam | 6.3 | N/A | N/A |
| Van Buren County | Silty clay loam | 6.1 | Somewhat poorly drained | Alfisols |
| Wapello County | Silt Loam | 6.2 | N/A | N/A |
| Warren County | Silt Loam | 6.3 | N/A | N/A |
| Washington County | Silt Loam | 6.3 | N/A | N/A |
| Wayne County | Silty Clay Loam | 6.2 | N/A | N/A |
| Webster County | Loam | 6.7 | N/A | N/A |
| Winnebago County | Loam | 6.5 | N/A | N/A |
| Winneshiek County | Loamy fine sand | 6.3 | Excessively drained | Mollisols |
| Woodbury County | Silt Loam | 6.9 | N/A | N/A |
| Worth County | Silt loam | 6.5 | Somewhat poorly drained | Mollisols |
| Wright County | Loam | 6.5 | N/A | N/A |