San Juan County, Utah, Central Part
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, Central Part.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Rizno-Barx-Yarts complex | 126K | Well drained | D | Very limited | Very limited |
| Rizno-Rock outcrop complex | 81K | Well drained | D | Very limited | Very limited |
| Rock outcrop-Piute-Skos association | 74K | D | Not rated | Not rated | |
| Rizno-Skos-Rock outcrop complex | 71K | Well drained | D | Very limited | Very limited |
| Rizno-Littlenan-Bodot association | 70K | Well drained | D | Very limited | Very limited |
| Myton family-Skos-Rock outcrop association | 70K | Well drained | D | Very limited | Very limited |
| Rizno-Ruinpoint-Rock outcrop complex | 65K | Well drained | D | Not rated | Not rated |
| Bodot-Strych-Skos association | 64K | Well drained | C | Very limited | Very limited |
| Skos,warm-Rock outcrop complex | 45K | Well drained | D | Very limited | Very limited |
| Bluechief-Limeridge-Nakai complex, 1 to 6 percent slopes | 41K | Well drained | B | Very limited | Very limited |
| Rock outcrop-Strych-Rizno association | 41K | Well drained | D | Very limited | Very limited |
| Strych-Rizno-Strych, very steep association | 36K | Well drained | A | Very limited | Very limited |
| Rizno-Cahona-Rock outcrop complex | 34K | Well drained | D | Very limited | Very limited |
| Moenkopie-Moenkopie,warm, complex | 34K | Well drained | D | Very limited | Very limited |
| Ruinpoint-Cahona association | 31K | Well drained | B | Somewhat limited | Somewhat limited |
| Moenkopie-Rock outcrop complex | 30K | D | Not rated | Not rated | |
| Piute-Sheppard-Rock outcrop association | 30K | D | Not rated | Very limited | |
| Littlenan-Ruinpoint-Rizno association, 1 to 20 percent slopes | 29K | Well drained | D | Very limited | Very limited |
| Milok-Mivida complex | 25K | Well drained | A | Not limited | Not limited |
| Strych, warm-Skos, warm-Badland complex | 24K | Well drained | A | Very limited | Very limited |
What This Means
Building & Foundations
About 75% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes. A geotechnical assessment is recommended before building.
Septic Systems
About 78% 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.