Tohono O'Odham Nation, Arizona, Parts of Maricopa, Pima and Pinal Counties
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 Tohono O'Odham Nation, Arizona, Parts of Maricopa, Pima and Pinal Counties.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Bucklebar-Hayhook-Tubac complex, 0 to 3 percent slopes | 225K | Well drained | B | Somewhat limited | Somewhat limited |
| Nahda-Stagecoach complex, 1 to 15 percent slopes | 136K | Well drained | D | Not limited | Very limited |
| Mohall-Trix complex, 0 to 1 percent slopes | 131K | Well drained | C | Somewhat limited | Very limited |
| Dateland-Denure complex, 0 to 3 percent slopes | 121K | Well drained | A | Not limited | Somewhat limited |
| Delnorte-Stagecoach complex, 1 to 20 percent slopes | 114K | Well drained | D | Very limited | Very limited |
| Soledad-Topawa complex, 1 to 5 percent slopes | 112K | Well drained | A | Not limited | Not limited |
| Mohall-Pahaka complex, 1 to 3 percent slopes | 112K | Well drained | C | Not limited | Very limited |
| Lajitas-Bosa-Rock outcrop complex, 15 to 50 percent slopes | 108K | Well drained | D | Very limited | Very limited |
| Delthorny-Garzona-Rock outcrop complex, 15 to 60 percent slopes | 108K | Well drained | D | Very limited | Very limited |
| Hickiwan-Gunsight-Momoli complex, 3 to 15 percent slopes | 91K | Well drained | D | Somewhat limited | Very limited |
| Pinamt-Momoli complex, 1 to 10 percent slopes | 86K | Well drained | C | Not limited | Very limited |
| Denure-Momoli complex, 1 to 5 percent slopes | 84K | Somewhat excessively drained | A | Not limited | Not limited |
| Casa Grande-Rositas-Valencia complex, 0 to 5 percent slopes | 83K | Well drained | C | Somewhat limited | Very limited |
| Pajarito-Sahuarita complex, 1 to 3 percent slopes | 79K | Well drained | A | Not limited | Not limited |
| Glenbar loam, 0 to 1 percent slopes | 75K | Well drained | C | Very limited | Very limited |
| Anklam-Cellar-Rock outcrop complex, 15 to 55 percent slopes | 71K | Well drained | D | Very limited | Very limited |
| Tucson-Mohall-Valencia complex, 1 to 3 percent slopes | 68K | Well drained | C | Somewhat limited | Somewhat limited |
| Wintersburg loam, 0 to 1 percent slopes | 65K | Well drained | C | Not limited | Very limited |
| Vado-Agustin complex, 1 to 8 percent slopes | 63K | Well drained | A | Not limited | Not limited |
| Vecont clay loam, 0 to 1 percent slopes | 62K | Well drained | C | Very limited | Very limited |
What This Means
Building & Foundations
About 27% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 62% 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.