Coconino County Area, Arizona, Central Part
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 Coconino County Area, Arizona, Central Part.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Winona-Boysag gravelly loams, 0 to 8 percent slopes | 309K | Well drained | D | Very limited | Very limited |
| Winona stony loam, 0 to 8 percent slopes | 132K | Well drained | D | Very limited | Very limited |
| Winona gravelly loam, 0 to 8 percent slopes | 125K | Well drained | D | Very limited | Very limited |
| Thunderbird-Springerville association, strongly sloping | 106K | Well drained | D | Very limited | Very limited |
| Epikom complex, 0 to 15 percent slopes | 105K | Well drained | D | Very limited | Very limited |
| Meriwhitica-Wayneco-Tassi complex, warm, 1 to 11 percent slopes | 85K | Well drained | D | Very limited | Very limited |
| Disterheff very gravelly sandy clay loam, 1 to 15 percent slopes | 76K | Well drained | C | Very limited | Very limited |
| Winona-Rock outcrop complex, 15 to 30 percent slopes | 71K | Well drained | D | Very limited | Very limited |
| Deama-Rock outcrop complex, 8 to 30 percent slopes | 61K | Well drained | D | Very limited | Very limited |
| Deama gravelly loam, 2 to 15 percent slopes | 56K | Well drained | D | Very limited | Very limited |
| Rune-Disterheff association, gently sloping | 46K | Well drained | C | Very limited | Very limited |
| Ashfork gravelly clay loam, 1 to 15 percent slopes | 45K | Well drained | D | Very limited | Very limited |
| Thunderbird-Rock outcrop complex, 30 to 60 percent slopes | 41K | Well drained | D | Very limited | Very limited |
| Winona-Tusayan association, gently sloping | 39K | Well drained | D | Very limited | Very limited |
| Purgatory gravelly fine sandy loam, 0 to 8 percent slopes | 36K | Well drained | C | Very limited | Very limited |
| Deama stony loam, 1 to 15 percent slopes | 36K | Well drained | D | Very limited | Very limited |
| Daze-Deama association, moderately steep | 36K | Well drained | D | Very limited | Very limited |
| Poley-Tusayan association, gently sloping | 34K | Well drained | C | Not limited | Somewhat limited |
| Poley gravelly loam, 0 to 8 percent slopes | 34K | Well drained | C | Not limited | Somewhat limited |
| Rune silty clay loam, 0 to 8 percent slopes | 32K | Well drained | C | Very limited | Very limited |
What This Means
Building & Foundations
About 95% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 95% 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.