Okanogan County Area, Washington
The dominant drainage class is Well drained and the dominant hydrologic group is D (very slow infiltration, high 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 Okanogan County Area, Washington.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Lithic Haploxerepts-Conconully complex, 15 to 45 percent slopes | 58K | Well drained | D | Very limited | Very limited |
| Conconully gravelly ashy loam, 0 to 25 percent slopes, extremely stony | 45K | Well drained | C | Somewhat limited | Somewhat limited |
| Lithic Haploxerepts-Donavan-Rock outcrop complex, 15 to 45 percent slopes | 35K | Well drained | D | Very limited | Very limited |
| Lithic Haploxerepts-Molson complex, 15 to 45 percent slopes | 30K | Well drained | D | Very limited | Very limited |
| Conconully gravelly ashy loam, 25 to 65 percent slopes, extremely stony | 23K | Well drained | C | Very limited | Very limited |
| Lithic Haploxerepts-Cashmont complex, 15 to 45 percent slopes | 23K | Well drained | D | Very limited | Very limited |
| Newbon gravelly loam, 25 to 45 percent south slopes | 23K | Well drained | B | Very limited | Very limited |
| Donavan-Rock outcrop complex, 20 to 40 percent slopes | 22K | Well drained | B | Very limited | Very limited |
| Lithic Haploxerepts-Vallan complex, 15 to 45 percent slopes | 21K | Well drained | D | Very limited | Very limited |
| Nevine-Merkel complex, 15 to 35 percent slopes | 17K | Well drained | B | Very limited | Very limited |
| Nevine-Louploup complex, 3 to 15 percent slopes | 17K | Well drained | B | Somewhat limited | Somewhat limited |
| Merkel ashy sandy loam, 15 to 35 percent slopes | 17K | Well drained | B | Very limited | Very limited |
| Water | 17K | Not rated | Not rated | ||
| Kartar cobbly ashy sandy loam, 25 to 65 percent slopes, extremely stony | 15K | Well drained | A | Very limited | Very limited |
| Nevine-Louploup complex, 15 to 35 percent slopes | 15K | Well drained | B | Very limited | Very limited |
| Conconully gravelly ashy loam, 8 to 15 percent slopes | 15K | Well drained | C | Somewhat limited | Somewhat limited |
| Rock outcrop | 14K | Very limited | Very limited | ||
| Nevine-Wilma-Rock outcrop complex, 15 to 35 percent slopes | 13K | Well drained | B | Very limited | Very limited |
| Pogue gravelly fine sandy loam, 25 to 65 percent slopes, extremely stony | 13K | Somewhat excessively drained | A | Very limited | Very limited |
| Pogue fine sandy loam, 0 to 5 percent slopes | 12K | Well drained | A | Not limited | Not limited |
What This Means
Building & Foundations
About 76% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes. A geotechnical assessment is recommended before building.
Septic Systems
About 76% 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
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.