Pocahontas County, Iowa
The most common soil here is Webster, on about 24% of the land: a silty clay loam, smooth and slightly sticky. Canisteo and Clarion come next.
About 6% of the land drains well, and 78% stays wet for long stretches; groundwater comes within two feet of the surface under 78% of it.
USDA rates 96% of the land very limited for a standard septic drain field, and 78% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 3% of the land floods occasionally or more.
Soils change over short distances, so look up an address below for the soil at that exact spot and the reasons behind each rating.
The soils you're most likely standing on
The biggest named soils in Pocahontas County, Iowa, each drawn five feet deep from its official USDA description, in its recorded colors.
Dots mark gravel; white flecks mark lime. Shares are by acres across the survey area, and each mapped patch usually mixes several of these soils.
The biggest mapped areas
The dominant drainage class is Poorly drained and the dominant hydrologic group is C/D (varies with drainage). The most common soil order is Mollisols — grassland soils with a thick, dark, fertile topsoil rich in organic matter. This report summarizes the major soil map units across the survey area to help you understand what to expect when buying, building, or gardening in Pocahontas County, Iowa. Search your address to find the exact soil composition, drainage, and series details at your specific location.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Webster clay loam, 0 to 2 percent slopes | 95K | Poorly drained | C/D | Very limited | Very limited |
| Canisteo clay loam, 0 to 2 percent slopes | 81K | Poorly drained | C/D | Very limited | Very limited |
| Clarion loam, 2 to 6 percent slopes | 56K | Moderately well drained | C | Somewhat limited | Very limited |
| Nicollet clay loam, 1 to 3 percent slopes | 53K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Okoboji silty clay loam, 0 to 1 percent slopes | 18K | Very poorly drained | C/D | Very limited | Very limited |
| Clarion loam, 6 to 10 percent slopes, moderately eroded | 9K | Well drained | B | Somewhat limited | Somewhat limited |
| Harps clay loam, 0 to 2 percent slopes | 8K | Poorly drained | C/D | Very limited | Very limited |
| Coland clay loam, 0 to 2 percent slopes, occasionally flooded | 6K | Poorly drained | C/D | Very limited | Very limited |
| Talcot clay loam, 32 to 40 inches to sand and gravel, 0 to 2 percent slopes | 4K | Poorly drained | C/D | Very limited | Very limited |
| Okoboji mucky silty clay loam, 0 to 1 percent slopes | 4K | Very poorly drained | C/D | Very limited | Very limited |
| Wadena loam, 2 to 6 percent slopes | 3K | Well drained | B | Not limited | Very limited |
| Biscay clay loam, 0 to 2 percent slopes | 3K | Poorly drained | C/D | Very limited | Very limited |
| Knoke silty clay loam, 0 to 1 percent slopes | 3K | Very poorly drained | C/D | Very limited | Very limited |
| Cylinder loam, 0 to 2 percent slopes | 2K | Somewhat poorly drained | B/D | Very limited | Very limited |
| Kossuth silty clay loam, 0 to 2 percent slopes | 2K | Poorly drained | C/D | Very limited | Very limited |
| Storden loam, 6 to 10 percent slopes, moderately eroded | 2K | Well drained | B | Somewhat limited | Somewhat limited |
| Havelock clay loam, 0 to 2 percent slopes | 2K | Poorly drained | C/D | Very limited | Very limited |
| Wacousta silty clay loam, 0 to 1 percent slopes | 1K | Very poorly drained | C/D | Very limited | Very limited |
| Havelock clay loam, channeled, 0 to 2 percent slopes | 1K | Poorly drained | C/D | Very limited | Very limited |
| Knoke mucky silty clay loam, 0 to 1 percent slopes | 1K | Very poorly drained | C/D | Very limited | Very limited |
Soil Orders in This Area
The USDA classifies every soil into one of 12 soil orders. Here are the dominant orders found in this survey area.
What This Means
Building & Foundations
About 78% of soils are rated "very limited" for dwellings with basements. Specific challenges include poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 96% of soils are rated "very limited" for septic absorption fields. Poorly drained soils can't absorb septic effluent effectively. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Many soils hold water for extended periods. Raised beds are highly recommended to improve drainage for vegetables. Well-adapted native plants and water-loving species will do best in natural conditions.