Pinnacles National Monument, California
The most common soil here is Ordeal, on about 16% of the land: a loamy sand, gritty and loose. Backdoor and Tuborcio come next.
About 98% of the land drains well.
USDA rates all of the land very limited for a standard septic drain field, and 96% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: bedrock lies within 40 inches under 69% 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 Pinnacles National Monument, California, 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 Mollisols — grassland soils with a thick, dark, fertile topsoil rich in organic matter. 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 Pinnacles National Monument, California. 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 |
|---|---|---|---|---|---|
| Ordeal-Longsfolly-Passion complex, 9 to 50 percent slopes | 4K | Somewhat excessively drained | A | Very limited | Very limited |
| Backdoor-Tuborcio complex, 20 to 70 percent slopes | 4K | Well drained | C | Very limited | Very limited |
| Ordeal-Passion-Badlands association, 50 to 100 percent slopes | 3K | Somewhat excessively drained | B | Very limited | Very limited |
| Backdoor-Tuborcio complex, 35 to 50 percent slopes | 2K | Well drained | C | Very limited | Very limited |
| Ordeal-Tuborcio-Passion complex, 20 to 50 percent slopes | 2K | Somewhat excessively drained | B | Very limited | Very limited |
| Chalone-Knuckle-Firstsister complex, 50 to 70 percent slopes | 2K | Well drained | C | Very limited | Very limited |
| Knuckle-Burgundy-Argixerolls complex, 20 to 70 percent slopes | 2K | Well drained | D | Very limited | Very limited |
| Rock outcrop-Highpeaks-Burgundy complex, 35 to 100 percent slopes | 1K | Well drained | D | Very limited | Very limited |
| Chalone-Firstsister-Highpeaks complex, 50 to 70 percent slopes | 1K | Well drained | C | Very limited | Very limited |
| Tuborcio sandy loam, 35 to 50 percent slopes | 790 | Well drained | C | Very limited | Very limited |
| Rock outcrop-Highpeaks-Chalone complex, 35 to 50 percent slopes | 730 | Well drained | D | Very limited | Very limited |
| Chalone-Knuckle-Rock outcrop complex, 35 to 50 percent slopes | 651 | Well drained | D | Very limited | Very limited |
| Argixerolls-Rock outcrop-Chalone complex, 35 to 50 percent slopes | 623 | Well drained | C | Very limited | Very limited |
| Casino-Argixerolls complex, 50 to 70 percent slopes | 436 | Moderately well drained | D | Very limited | Very limited |
| Highpeaks-Rock outcrop complex, 35 to 50 percent slopes | 282 | Well drained | D | Very limited | Very limited |
| Pinnacles coarse sandy loam, 5 to 30 percent slopes | 267 | Well drained | C | Very limited | Very limited |
| Toags-Oxyaquic Haploxerolls-Riverwash complex, 0 to 2 percent slopes | 254 | Somewhat excessively drained | A | Not limited | Very limited |
| Pinnacles coarse sandy loam, 30 to 75 percent slopes | 240 | Well drained | D | Very limited | Very limited |
| Teapot-Rock outcrop complex, 35 to 50 percent slopes | 191 | Well drained | B | Very limited | Very limited |
| Tuborcio loam, 2 to 20 percent slopes | 185 | Well drained | C | Somewhat limited | Very 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 96% 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 100% 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.