San Bernardino County, California, Mojave River Area
The dominant drainage class is Somewhat excessively drained and the dominant hydrologic group is A (high infiltration, low 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 Bernardino County, California, Mojave River Area.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| CAJON SAND, 2 TO 9 PERCENT SLOPES | 117K | Somewhat excessively drained | A | Not limited | Very limited |
| ROCK OUTCROP-LITHIC TORRIORTHENTS COMPLEX, 15 TO 50 PERCENT SLOPES* | 113K | D | Very limited | Very limited | |
| CAJON-ARIZO COMPLEX, 2 TO 15 PERCENT SLOPES* | 66K | Somewhat excessively drained | A | Very limited | Very limited |
| CAJON GRAVELLY SAND, 2 TO 15 PERCENT SLOPES | 59K | Somewhat excessively drained | A | Very limited | Very limited |
| CAJON SAND, 0 TO 2 PERCENT SLOPES | 46K | Somewhat excessively drained | A | Not limited | Very limited |
| MIRAGE-JOSHUA COMPLEX, 2 TO 5 PERCENT SLOPES* | 44K | Well drained | C | Somewhat limited | Very limited |
| HELENDALE-BRYMAN LOAMY SANDS, 2 TO 5 PERCENT SLOPES* | 44K | Well drained | A | Not limited | Not limited |
| SPARKHULE-ROCK OUTCROP COMPLEX, 15 TO 50 PERCENT SLOPES* | 43K | Well drained | D | Very limited | Very limited |
| NOROB-HALLORAN COMPLEX, 0 TO 5 PERCENT SLOPES* | 42K | Moderately well drained | C | Not limited | Very limited |
| BRYMAN LOAMY FINE SAND, 0 TO 2 PERCENT SLOPES | 38K | Well drained | C | Not limited | Very limited |
| NEBONA-CUDDEBACK COMPLEX, 2 TO 9 PERCENT SLOPES* | 32K | Well drained | D | Very limited | Very limited |
| MANET COARSE SAND, 2 TO 5 PERCENT SLOPES | 29K | Well drained | A | Very limited | Somewhat limited |
| CAJON LOAMY SAND, LOAMY SUBSTRATUM, 0 TO 2 PERCENT SLOPES | 29K | Somewhat excessively drained | A | Not limited | Somewhat limited |
| BRYMAN LOAMY FINE SAND, 2 TO 5 PERCENT SLOPES | 26K | Well drained | C | Somewhat limited | Very limited |
| MIRAGE SANDY LOAM, 2 TO 5 PERCENT SLOPES* | 22K | Well drained | C | Somewhat limited | Very limited |
| HALLORAN SANDY LOAM | 21K | Moderately well drained | C | Very limited | Somewhat limited |
| GULLIED LAND-HAPLOXERALFS ASSOCIATION | 20K | Not limited | Not limited | ||
| PLAYAS | 20K | Not rated | Not rated | ||
| HESPERIA LOAMY FINE SAND, 2 TO 5 PERCENT SLOPES | 19K | Well drained | A | Not limited | Not limited |
| YERMO-KIMBERLINA, COOL, ASSOCIATION, SLOPING* | 18K | Somewhat excessively drained | A | Very limited | Very limited |
What This Means
Building & Foundations
About 45% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 78% of soils are rated "very limited" for septic absorption fields. The well-drained soils may actually drain too fast for standard leach fields, allowing effluent to reach groundwater. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Soils tend to drain very quickly, meaning nutrients and water don't stick around long. Raised beds with amended soil, drip irrigation, and heavy mulching will give the best results. Compost is your best friend here — it improves water retention dramatically.