Olmsted County, Minnesota
The most common soil here is Downs, on about 16% of the land: a silt loam, smooth, like flour. Tama and Rockton come next.
About 68% of the land drains well, and 22% stays wet for long stretches; groundwater comes within two feet of the surface under 22% of it.
USDA rates 91% of the land very limited for a standard septic drain field, and 49% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 11% of the land floods occasionally or more, and bedrock lies within 40 inches under 13% of it.
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 Olmsted County, Minnesota, 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 Well drained and the dominant hydrologic group is C (slow infiltration, moderate runoff). The most common soil order is Alfisols — moderately leached forest soils with a clay-enriched subsoil. 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 Olmsted County, Minnesota. 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 |
|---|---|---|---|---|---|
| Downs silt loam, 2 to 6 percent slopes, moderately eroded | 43K | Well drained | C | Somewhat limited | Very limited |
| Downs silt loam, 6 to 12 percent slopes, moderately eroded | 29K | Well drained | C | Somewhat limited | Very limited |
| Tama silt loam, driftless, 2 to 6 percent slopes | 18K | Well drained | C | Somewhat limited | Very limited |
| Floyd silt loam, 1 to 4 percent slopes | 11K | Somewhat poorly drained | B/D | Very limited | Very limited |
| Garwin silty clay loam | 10K | Poorly drained | B/D | Very limited | Very limited |
| Racine loam, 2 to 5 percent slopes | 10K | Well drained | C | Not limited | Very limited |
| Clyde silty clay loam, 0 to 3 percent slopes | 9K | Poorly drained | C/D | Very limited | Very limited |
| Lindstrom silt loam, 2 to 6 percent slopes | 9K | Well drained | B | Not limited | Somewhat limited |
| Chaseburg silt loam, moderately well drained, 0 to 2 percent slopes | 9K | Moderately well drained | B | Very limited | Very limited |
| Joy silt loam, 1 to 4 percent slopes | 9K | Somewhat poorly drained | B/D | Very limited | Very limited |
| Rockton loam, 1 to 6 percent slopes | 7K | Well drained | C | Very limited | Very limited |
| Channahon loam, 6 to 12 percent slopes | 7K | Well drained | D | Very limited | Very limited |
| Otter silt loam, channeled | 7K | Poorly drained | B/D | Very limited | Very limited |
| Kenyon loam, 2 to 5 percent slopes | 7K | Moderately well drained | C | Somewhat limited | Very limited |
| Tama silt loam, driftless, 6 to 12 percent slopes, moderately eroded | 7K | Well drained | C | Somewhat limited | Very limited |
| Timula silt loam, 6 to 12 percent slopes, moderately eroded | 7K | Well drained | B | Not limited | Somewhat limited |
| Downs silt loam, 12 to 18 percent slopes, moderately eroded | 6K | Well drained | C | Very limited | Very limited |
| Waukee loam, 0 to 2 percent slopes | 6K | Well drained | B | Not limited | Very limited |
| Tama silt loam, driftless, 0 to 2 percent slopes | 6K | Well drained | C | Somewhat limited | Very limited |
| Arenzville silt loam, 0 to 3 percent slopes, occasionally flooded | 6K | Moderately well drained | B | 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 49% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 91% of soils are rated "very limited" for septic absorption fields. Despite good drainage overall, limitations may stem from shallow bedrock, steep slopes, or seasonal conditions. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Drainage is generally favorable for gardening. Adding compost and mulch will improve fertility and water retention. Test your soil's pH before planting — most vegetables prefer 6.0-7.0.