Pinal County, Arizona, Western Part
The most common soil here is Denure, on about 16% of the land: a gravelly sandy loam, gritty and crumbly. Mohall and Casa Grande come next.
About 99% of the land drains well.
USDA rates 69% of the land very limited for a standard septic drain field, and 41% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 16% of the land floods occasionally or more, and bedrock lies within 40 inches under 6% of it.
Soils change over short distances, so look up an address below for the soil at that exact spot and the reasons behind each rating.
The soils you're most likely standing on
The biggest named soils in Pinal County, Arizona, Western Part, each drawn five feet deep from its official USDA description, in its recorded colors.
Dots mark gravel; white flecks mark lime. Shares are by acres across the survey area, and each mapped patch usually mixes several of these soils.
The biggest mapped areas
The dominant drainage class is Well drained and the dominant hydrologic group is C (slow infiltration, moderate runoff). The most common soil order is Aridisols — dry-climate soils with limited organic matter and often calcium carbonate accumulation. 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 Pinal County, Arizona, Western Part. Search your address to find the exact soil composition, drainage, and series details at your specific location.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Denure sandy loam, 1 to 3 percent slopes | 121K | Somewhat excessively drained | A | Not limited | Very limited |
| Casa Grande fine sandy loam, 0 to 3 percent slopes | 86K | Well drained | C | Somewhat limited | Not limited |
| Glenbar clay loam, 0 to 2 percent slopes | 59K | Well drained | C | Very limited | Very limited |
| Mohall loam MLRA 40 | 52K | Well drained | C | Not limited | Very limited |
| Dateland fine sandy loam | 45K | Well drained | B | Very limited | Somewhat limited |
| Pinamt-Momoli complex, 1 to 8 percent slopes | 41K | Well drained | C | Not limited | Not limited |
| Mohall sandy loam, 0 to 1 percent slopes | 35K | Well drained | C | Very limited | Very limited |
| Vaiva-Rock outcrop complex, 15 to 50 percent slopes | 34K | Somewhat excessively drained | D | Very limited | Very limited |
| Sasco silt loam | 30K | Well drained | C | Very limited | Very limited |
| Casa Grande clay loam | 29K | Well drained | C | Somewhat limited | Very limited |
| Gunsight-Cipriano complex, 1 to 8 percent slopes | 28K | Somewhat excessively drained | B | Somewhat limited | Not limited |
| Marana silty clay loam | 28K | Well drained | C | Very limited | Very limited |
| Mohall clay loam | 26K | Well drained | C | Somewhat limited | Very limited |
| Contine clay loam | 25K | Well drained | C | Very limited | Very limited |
| Denure fine sandy loam, 0 to 1 percent slopes | 24K | Somewhat excessively drained | A | Not limited | Very limited |
| Laveen loam | 23K | Well drained | B | Not limited | Somewhat limited |
| Trix clay loam | 23K | Well drained | C | Very limited | Very limited |
| Gilman fine sandy loam, 0 to 2 percent slopes | 20K | Well drained | A | Very limited | Very limited |
| Toltec fine sandy loam | 19K | Well drained | B | Not limited | Somewhat limited |
| Momoli-Carrizo complex, 1 to 8 percent slopes | 19K | Somewhat excessively drained | A | Not limited | Not limited |
Soil Orders in This Area
The USDA classifies every soil into one of 12 soil orders. Here are the dominant orders found in this survey area.
What This Means
Building & Foundations
About 41% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 69% 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.