Soil series profile
Saurin soil series
Saurin is a well drained soil with a clay loam surface, mapped on 22,926 acres in 1 county in CA. Hydrologic group C.
- Drainage class
- Well drained 90% of mapped acres
- Hydrologic group
- C 90% of mapped acres
- Typical topsoil pH
- 6.1 slightly acidic · range 6.1–6.1
- Mapped area
- 23k acres in 1 county, 1 state
Typical Saurin profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–10 in (H1) | Clay loam | 6.1 | 30% | 34% | 2% |
| 10–33 in (H2) | Clay loam | 6.1 | 33% | 35% | 0.75% |
| 33–37 in (H3) | Bedrock | Not reported | Not reported | Not reported | Not reported |
What this means
What Saurin soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in Saurin soils is slightly acidic: pH 6.1, the range most vegetables, flowers and lawn grasses prefer.
Loamy topsoil (loam, silt loam and similar) covers 90% of mapped Saurin acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is clay loam (90% of mapped Saurin acres).
90% of mapped Saurin acres is moderately well to excessively drained, which suits most garden plants.
For lawns and yards
On 90% of mapped acres, rain soaks in slowly (hydrologic groups C and D, including dual groups that are D until drained). Expect runoff and puddles after heavy rain: core-aerate compacted lawns and keep ground sloping away from foundations.
For a septic system
For conventional septic absorption fields, NRCS rates 90% of the acres in mapped Saurin soils very limited, 0% somewhat limited and 0% not limited (10% 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 Saurin soil is found
Mapped acres
Saurin is mapped in California.
| County | Acres | Share of county land |
|---|---|---|
| Marin County, CA | 22,926 | 6.9% |
Septic absorption fields
NRCS rating, share of Saurin acres
Show as a table
| Category | Share of acres |
|---|---|
| Not limited | 0.0% |
| Somewhat limited | 0.0% |
| Very limited | 90.0% |
| Not rated | 10.0% |
Drainage, water table and flooding
Share of Saurin 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 23–63% (median 40%).
- 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 | 90.0% |
| Moderately well drained | 0.0% |
| Somewhat poorly drained | 0.0% |
| Poorly drained | 0.0% |
| Very poorly drained | 0.0% |
| Not rated | 10.0% |
Hydrologic soil group
Show as a table
| Category | Share of acres |
|---|---|
| A: fast infiltration (mostly sandy or gravelly) | 0.0% |
| B: moderate infiltration | 0.0% |
| C: slow infiltration | 90.0% |
| 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 | 10.0% |
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 Saurin (component kind "Series") in SSURGO: 22,926 acres.
- Method
- Shares are by mapped acres of Saurin components. The profile comes from the single largest Saurin component. Full methodology.