Grant County, Washington
The dominant drainage class is Well drained and the dominant hydrologic group is B (moderate infiltration). 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 Grant County, Washington.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Quincy fine sand, 2 to 15 percent slopes | 148K | Somewhat excessively drained | A | Somewhat limited | Very limited |
| Bakeoven-Roloff complex, 0 to 25 percent slopes | 68K | Well drained | D | Very limited | Very limited |
| Starbuck-Bakeoven-Rock outcrop complex, 0 to 45 percent slopes | 66K | Well drained | D | Very limited | Very limited |
| Renslow silt loam, 0 to 5 percent slopes | 56K | Well drained | B | Not limited | Somewhat limited |
| Quincy loamy fine sand, 0 to 15 percent slopes | 53K | Somewhat excessively drained | A | Not limited | Very limited |
| Malaga stony sandy loam, 0 to 15 percent slopes | 53K | Somewhat excessively drained | B | Not limited | Not limited |
| Renslow association | 49K | Well drained | B | Somewhat limited | Somewhat limited |
| Shano silt loam, 2 to 5 percent slopes | 45K | Well drained | B | Not limited | Somewhat limited |
| Burbank loamy fine sand, 0 to 5 percent slopes | 38K | Excessively drained | A | Not limited | Very limited |
| Malaga gravelly sandy loam, 0 to 5 percent slopes | 32K | Somewhat excessively drained | B | Not limited | Not limited |
| Malaga very stony sandy loam, 0 to 35 percent slopes | 32K | Somewhat excessively drained | B | Very limited | Very limited |
| Strat stony loam, 0 to 25 percent slopes | 30K | Well drained | B | Somewhat limited | Very limited |
| Schawana complex, 0 to 15 percent slopes | 28K | Somewhat excessively drained | D | Very limited | Very limited |
| Scoon silt loam, 0 to 5 percent slopes | 27K | Well drained | D | Very limited | Very limited |
| Zen-Lickskillet-Ralls complex, 5 to 45 percent slopes | 27K | Well drained | C | Very limited | Very limited |
| Warden silt loam, 0 to 2 percent slopes | 26K | Well drained | B | Not limited | Somewhat limited |
| Starbuck-Prosser complex, 0 to 25 percent slopes | 24K | Well drained | D | Very limited | Very limited |
| Malaga cobbly sandy loam, 0 to 15 percent slopes | 24K | Somewhat excessively drained | B | Not limited | Not limited |
| Bagdad silt loam, 5 to 20 percent slopes | 24K | Well drained | B | Somewhat limited | Somewhat limited |
| Wanser-Quincy fine sands, 0 to 5 percent slopes | 22K | Poorly drained | A/D | Very limited | Very limited |
What This Means
Building & Foundations
About 33% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 64% 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.