Soil series profile
Andregg soil series
Andregg is a well drained soil with a coarse sandy loam surface, mapped on 39,365 acres in 4 counties in CA. Hydrologic group B.
- Drainage class
- Well drained 94% of mapped acres
- Hydrologic group
- B 91% of mapped acres
- Typical topsoil pH
- 6.5 slightly acidic · range 6.5–6.5
- Mapped area
- 39k acres in 4 counties, 1 state
Typical Andregg profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–15 in (H1) | Coarse sandy loam | 6.5 | 13% | 68% | 2% |
| 15–29 in (H2) | Coarse sandy loam | 6.1 | 13% | 68% | 0.5% |
| 29–33 in (H3) | Weathered bedrock | Not reported | Not reported | Not reported | Not reported |
What this means
What Andregg soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in Andregg soils is slightly acidic: pH 6.5, the range most vegetables, flowers and lawn grasses prefer.
Loamy topsoil (loam, silt loam and similar) covers 91% of mapped Andregg acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is coarse sandy loam (91% of mapped Andregg acres).
94% of mapped Andregg acres is moderately well to excessively drained, which suits most garden plants.
For lawns and yards
Most land is in hydrologic groups B and C, where rain soaks in at a moderate pace.
For a septic system
For conventional septic absorption fields, NRCS rates 91% of the acres in mapped Andregg soils very limited, 0% somewhat limited and 0% not limited (9% not rated, such as urban land, pits or water).
Where the soil is very limited (slow permeability, a high water table, flooding, shallow bedrock or steep slopes), alternative systems such as mound or sand-filter designs are common and cost more.
Only a licensed site evaluation or perc test at the actual lot decides whether a system is allowed and which design.
Where Andregg soil is found
Mapped acres
Andregg is mapped in California.
| County | Acres | Share of county land |
|---|---|---|
| Placer County, CA | 32,734 | 5.9% |
| San Luis Obispo County, CA | 4,392 | 0.3% |
| Sacramento County, CA | 1,740 | 0.3% |
| Nevada County, CA | 500 | 0.0% |
Septic absorption fields
NRCS rating, share of Andregg acres
Show as a table
| Category | Share of acres |
|---|---|
| Not limited | 0.0% |
| Somewhat limited | 0.0% |
| Very limited | 91.3% |
| Not rated | 8.7% |
Drainage, water table and flooding
Share of Andregg acres
- Depth to seasonal high water table
- None reported within about 6.5 feet (median where reported).
- Flooding
- Not mapped as flooding on most acres.
- Slope
- Typically 6–40% (median 9%).
- Topsoil organic matter
- Median 2%.
Drainage class
Show as a table
| Category | Share of acres |
|---|---|
| Excessively drained | 0.0% |
| Somewhat excessively drained | 0.0% |
| Well drained | 93.7% |
| Moderately well drained | 0.0% |
| Somewhat poorly drained | 0.0% |
| Poorly drained | 0.0% |
| Very poorly drained | 0.0% |
| Not rated | 6.3% |
Hydrologic soil group
Show as a table
| Category | Share of acres |
|---|---|
| A: fast infiltration (mostly sandy or gravelly) | 0.0% |
| B: moderate infiltration | 91.3% |
| C: slow infiltration | 0.0% |
| D: very slow infiltration (clayey, shallow or wet) | 0.0% |
| A/D: D as is, A if drained | 0.0% |
| B/D: D as is, B if drained | 0.0% |
| C/D: D as is, C if drained | 0.0% |
| Not rated | 8.7% |
Sources & data dates
- Source
- USDA NRCS Soil Survey Geographic Database (SSURGO), queried through Soil Data Access. Public domain.
- Data date
- SSURGO as published on November 3, 2026 (most recent survey area update October 26, 2026). NRCS refreshes SSURGO each October.
- Scope
- All map unit components named Andregg (component kind "Series") in SSURGO: 39,365 acres.
- Method
- Shares are by mapped acres of Andregg components. The profile comes from the single largest Andregg component. Full methodology.