Gila River Indian Reservation, Arizona, Parts of Maricopa 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 Gila River Indian Reservation, Arizona, Parts of Maricopa and Pinal Counties.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Quilotosa-Rock outcrop-Vaiva complex, 20 to 65 percent slopes | 34K | Somewhat excessively drained | D | Very limited | Very limited |
| Shontik-Redun complex, 0 to 3 percent slopes | 33K | Well drained | C | Somewhat limited | Very limited |
| Denure-Pahaka complex, 1 to 3 percent slopes | 31K | Well drained | A | Not limited | Not limited |
| Casa Grande complex, 0 to 5 percent slopes | 29K | Well drained | C | Somewhat limited | Very limited |
| Gadsden, Glenbar, and Vint soils, saline-sodic, 0 to 2 percent slopes | 28K | Well drained | C | Very limited | Very limited |
| Casa Grande fine sandy loam, 0 to 3 percent slopes | 22K | Well drained | C | Somewhat limited | Not limited |
| Redun-Shontik complex, 1 to 3 percent slopes | 21K | Well drained | C | Not limited | Very limited |
| Quilotosa-Momoli-Vaiva complex, 1 to 15 percent slopes | 18K | Somewhat excessively drained | D | Very limited | Very limited |
| Why-Brios complex, 0 to 2 percent slopes | 17K | Somewhat excessively drained | A | Very limited | Very limited |
| Gadsden silty clay loam, saline-sodic, 0 to 2 percent slopes | 13K | Well drained | C | Very limited | Very limited |
| Indio-Vint complex, saline-sodic, 0 to 3 percent slopes | 11K | Well drained | C | Not limited | Very limited |
| Cristobal-Gunsight complex, 3 to 15 percent slopes | 11K | Well drained | C | Somewhat limited | Very limited |
| Yahana silty clay loam, 0 to 2 percent slopes | 10K | Well drained | C | Very limited | Very limited |
| Yahana-Indio complex, saline-sodic, 0 to 3 percent slopes | 9K | Well drained | C | Very limited | Very limited |
| Cavelt-Carrizo-Gunsight complex, 1 to 10 percent slopes | 8K | Somewhat excessively drained | A | Not limited | Very limited |
| Brios very fine sandy loam, 0 to 2 percent slopes | 8K | Somewhat excessively drained | A | Very limited | Very limited |
| Indio silt loam, saline-sodic, 0 to 2 percent slopes | 8K | Well drained | C | Not limited | Very limited |
| Rillito-Gunsight complex, 3 to 15 percent slopes | 6K | B | Somewhat limited | Somewhat limited | |
| Kamato complex, 0 to 5 percent slopes | 6K | Well drained | C | Very limited | Very limited |
| Carrizo-Momoli complex, 1 to 3 percent slopes | 5K | Excessively drained | A | Somewhat limited | Very limited |
What This Means
Building & Foundations
About 43% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 81% 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
Drainage is generally favorable for gardening. Adding compost and mulch will improve fertility and water retention. Test your soil's pH before planting — most vegetables prefer 6.0-7.0.