Organ Pipe Cactus National Monument, Arizona
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 Organ Pipe Cactus National Monument, Arizona.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Gunsight very gravelly loam, 2 to 15 percent slopes | 58K | Well drained | B | Somewhat limited | Somewhat limited |
| Harqua-Gunsight complex | 34K | Well drained | C | Not limited | Not limited |
| Lomitas extremely stony loam, 8 to 40 percent slopes | 33K | Well drained | D | Very limited | Very limited |
| Rock land | 30K | Well drained | Not rated | Not rated | |
| Gilman very fine sandy loam | 26K | Well drained | B | Very limited | Very limited |
| Rillito gravelly sandy loam | 22K | Well drained | A | Not limited | Not limited |
| Stony land-Rock outcrop association | 22K | Well drained | Not rated | Not rated | |
| Antho fine sandy loam | 15K | Well drained | A | Very limited | Very limited |
| Growler-Antho complex | 14K | Well drained | A | Very limited | Very limited |
| Cherioni gravelly very fine sandy loam, 0 to 8 percent slopes | 13K | Well drained | D | Very limited | Very limited |
| Torrifluvents | 12K | Excessively drained | Not rated | Not rated | |
| Cipriano gravelly loam | 11K | Well drained | D | Not limited | Very limited |
| Gunsight very gravelly loam, 0 to 2 percent slopes | 10K | Well drained | B | Not limited | Somewhat limited |
| Ajo very gravelly loam, 1 to 5 percent slopes | 9K | Well drained | C | Somewhat limited | Very limited |
| Rock outcrop | 6K | Excessively drained | D | Not rated | Not rated |
| Ajo very cobbly sandy loam, 2 to 5 percent slopes | 3K | Well drained | C | Somewhat limited | Very limited |
| Gilman very fine sandy loam, saline | 2K | Well drained | B | Very limited | Very limited |
| Perryville very cobbly fine sandy loam, 0 to 8 percent slopes | 2K | Well drained | B | Not limited | Somewhat limited |
| Laveen loam | 2K | Well drained | B | Not limited | Somewhat limited |
| Gachado extremely cobbly loam, 2 to 8 percent slopes | 2K | Well drained | D | Very limited | Very limited |
What This Means
Building & Foundations
About 32% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 39% of soils have significant septic limitations, while others are more suitable. A perc test is essential — conditions vary across the area.
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.