San Juan County, Utah, Navajo Indian Reservation
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 San Juan County, Utah, Navajo Indian Reservation.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Rock outcrop, sandstone-Lithic Torriorthents, association, steep | 203K | D | Not rated | Not rated | |
| Lithic Torriorthents-Typic Torriorthents-Rock outcrop association, steep | 122K | Well drained | D | Very limited | Very limited |
| Aneth loamy fine sand, 1 to 8 percent slopes | 71K | Somewhat excessively drained | A | Not limited | Not limited |
| Badland | 58K | Not rated | Not rated | ||
| Rock outcrop-Moenkopie association, steep | 51K | D | Not rated | Not rated | |
| Sheppard fine sand, hummocky | 44K | Excessively drained | A | Not limited | Very limited |
| Hoskinnini-Rock outcrop complex, 2 to 8 percent slopes | 42K | Well drained | D | Very limited | Very limited |
| Deleco-Monue association, sloping | 40K | Well drained | D | Very limited | Very limited |
| Monue-Sheppard complex, 1 to 12 percent slopes | 40K | Well drained | A | Not limited | Somewhat limited |
| Nakai very fine sandy loam, 2 to 6 percent slopes | 38K | Well drained | A | Not limited | Not limited |
| Rock outcrop | 37K | D | Not rated | Not rated | |
| Mota loamy fine sand, 1 to 8 percent slopes | 33K | Well drained | A | Not limited | Not limited |
| Aneth-Sheppard association, rolling | 33K | Somewhat excessively drained | A | Very limited | Somewhat limited |
| Mota-Moenkopie-Rock outcrop association, sloping | 32K | Well drained | D | Not rated | Not rated |
| Badland-Typic Torrifluvents association, steep | 31K | Not rated | Not rated | ||
| Whit very fine sandy loam, 1 to 8 percent slopes | 28K | Well drained | B | Not limited | Somewhat limited |
| Moenkopie sandy loam, 3 to 8 percent slopes | 28K | Well drained | D | Very limited | Very limited |
| Deleco-Nakai-Rock outcrop association, sloping | 24K | Well drained | D | Very limited | Very limited |
| Ustollic Haplargids-Ustic Torriorthents-Rock outcrop association steep | 24K | Well drained | B | Very limited | Very limited |
| Sheppard fine sand, rolling | 21K | Excessively drained | A | Not limited | Very limited |
What This Means
Building & Foundations
About 31% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 34% 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.