Los Angeles County, California, Southeastern 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 Los Angeles County, California, Southeastern Part.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Urban land-Hueneme, drained-San Emigdio complex, 0 to 2 percent slopes | 67K | D | Very limited | Very limited | |
| Urban land-Palmview-Tujunga complex, 0 to 5 percent slopes | 64K | D | Very limited | Very limited | |
| Urban land-Azuvina-Montebello complex, 0 to 5 percent slopes | 40K | Well drained | C | Not limited | Not rated |
| Urban land-Palmview-Tujunga, gravelly complex, 2 to 9 percent slopes | 25K | A | Not limited | Very limited | |
| Counterfeit-Urban land complex, 10 to 35 percent slopes, terraced | 25K | Somewhat poorly drained | C | Very limited | Very limited |
| Urban land-Biscailuz-Hueneme, drained complex, 0 to 2 percent slopes | 22K | D | Very limited | Not rated | |
| Urban land-Soboba complex, 0 to 5 percent slopes | 17K | Somewhat excessively drained | D | Very limited | Very limited |
| Urban land-Sorrento-Arbolado complex, 2 to 9 percent slopes | 17K | Well drained | C | Not rated | Very limited |
| Urban land-Biscailuz-Pico complex, 0 to 2 percent slopes | 16K | D | Very limited | Very limited | |
| Urban land-Windfetch-Typic Haploxerolls complex, 0 to 2 percent slopes | 15K | D | Not rated | Very limited | |
| Zaca-Apollo, warm complex, 20 to 55 percent slopes | 14K | Well drained | C | Very limited | Very limited |
| Urban land-Ballona-Typic Xerorthents, fine substratum complex, 0 to 5 percent slopes | 13K | Well drained | C | Not rated | Very limited |
| Urban land-Metz-Pico complex, 0 to 2 percent slopes | 13K | D | Very limited | Very limited | |
| Urban land-Abaft-Marina complex, 0 to 15 percent slopes | 12K | D | Not limited | Very limited | |
| Urban land-Anthraltic Xerorthents, loamy substratum-Grommet complex, 0 to 5 percent slopes | 12K | D | Not rated | Not rated | |
| Urban land-Windfetch-Centinela complex, 0 to 5 percent slopes | 12K | Well drained | D | Not rated | Very limited |
| Water | 11K | D | Not rated | Not rated | |
| Urban land-Marina complex, 0 to 5 percent slopes | 11K | D | Not rated | Not rated | |
| Urban land-Thums-Pierview complex, 0 to 5 percent slopes | 11K | Well drained | C | Not rated | Very limited |
| Vista-Cieneba complex, 30 to 85 percent slopes | 10K | Well drained | B | Very limited | Very limited |
What This Means
Building & Foundations
About 58% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 77% 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.