St. Louis County and St. Louis City, Missouri
The dominant drainage class is Well drained and the dominant hydrologic group is C (slow infiltration, moderate runoff). 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 St. Louis County and St. Louis City, Missouri.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Urban land-Harvester complex, 2 to 9 percent slopes | 74K | Not rated | Not rated | ||
| Urban land-Harvester complex, 9 to 20 percent slopes | 35K | Not rated | Not rated | ||
| Urban land, upland, 0 to 5 percent slopes | 21K | Not rated | Not rated | ||
| Urban land-Harvester complex, karst, 2 to 9 percent slopes | 17K | Moderately well drained | C | Somewhat limited | Very limited |
| Menfro silt loam, 20 to 45 percent slopes | 16K | Well drained | C | Very limited | Very limited |
| Water | 12K | Subaqueous | Not rated | Not rated | |
| Fishpot-Urban land-Freeburg complex, 0 to 2 percent slopes, frequently flooded | 12K | Somewhat poorly drained | C | Very limited | Very limited |
| Urban land-Harvester complex, 0 to 2 percent slopes | 10K | Not rated | Not rated | ||
| Gasconade-Rock outcrop complex, 15 to 50 percent slopes, rubbly | 10K | Somewhat excessively drained | D | Very limited | Very limited |
| Goss very gravelly silt loam, 14 to 45 percent slopes | 9K | Well drained | C | Very limited | Very limited |
| Menfro silt loam, 9 to 14 percent slopes, eroded | 9K | Well drained | B | Somewhat limited | Somewhat limited |
| Urban land-Fishpot complex, 0 to 2 percent slopes, occasionally flooded | 8K | Not rated | Not rated | ||
| Menfro silt loam, 14 to 20 percent slopes, eroded | 8K | Well drained | C | Very limited | Very limited |
| Peers silty clay loam, 0 to 2 percent slopes, occasionally flooded | 8K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Haynie-Treloar-Blake complex, 0 to 2 percent slopes, frequently flooded | 8K | Well drained | B | Very limited | Very limited |
| Winfield-Urban land complex, 5 to 9 percent slopes | 7K | Moderately well drained | C | Somewhat limited | Very limited |
| Nevin-Urban land complex, 0 to 2 percent slopes | 7K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Winfield silt loam, 9 to 14 percent slopes, eroded | 7K | Moderately well drained | C | Somewhat limited | Very limited |
| Menfro silt loam, 5 to 9 percent slopes, eroded | 6K | Well drained | C | Somewhat limited | Very limited |
| Crider-Menfro silt loams, 14 to 30 percent slopes | 5K | Well drained | C | Very limited | Very limited |
What This Means
Building & Foundations
About 28% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 41% of soils have significant septic limitations, while others are more suitable. A perc test is essential — conditions vary across the area.
Gardening & Agriculture
Well-drained soils on sloped terrain — good for most plants but watch for erosion. Terracing, contour planting, and mulching help retain moisture and topsoil. Drip irrigation is more effective than sprinklers on slopes.