Soil series profile
Galt soil series
Galt is a moderately well drained soil with a clay surface, mapped on 43,694 acres in 6 counties in CA. Hydrologic group D.
- Drainage class
- Moderately well drained 39% of mapped acres
- Hydrologic group
- D 77% of mapped acres
- Typical topsoil pH
- 6.5 slightly acidic · range 6.5–7.0
- Mapped area
- 44k acres in 6 counties, 1 state
Typical Galt profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–5 in (A) | Clay | 6.5 | 40% | 30% | 1.6% |
| 5–13 in (Bss1) | Clay | 6.5 | 42% | 28% | 1.1% |
| 13–22 in (Bss2) | Clay | 7.0 | 50% | 22% | 0.9% |
| 22–32 in (Bss3) | Clay | 8.0 | 50% | 22% | 0.6% |
| 32–60 in (2Bkqm) | Cemented material | 8.4 | Not reported | Not reported | Not reported |

What this means
What Galt soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in Galt soils is slightly acidic: pH 6.5 (most land between 6.5 and 7.0), the range most vegetables, flowers and lawn grasses prefer.
Clayey topsoil covers 68% of mapped Galt acres. Clay holds water and nutrients but drains slowly and compacts if worked wet: add compost, avoid tilling soggy soil and consider raised beds. The most common surface texture is clay (68% of mapped Galt acres).
43% of mapped Galt acres is somewhat poorly to very poorly drained, so soil stays soggy for long spells after rain and in wet seasons. Raised beds, plants that tolerate wet feet, and not working the soil while wet all help.
For lawns and yards
On 82% 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 82% of the acres in mapped Galt soils very limited, 0% somewhat limited and 0% not limited (18% 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.
Flooding is mapped on 49% of the acres (<1% occasional, 4% frequent).
Only a licensed site evaluation or perc test at the actual lot decides whether a system is allowed and which design.
Where Galt soil is found
Mapped acres
Galt is mapped in California.
| County | Acres | Share of county land |
|---|---|---|
| Sacramento County, CA | 23,706 | 3.8% |
| San Joaquin County, CA | 9,565 | 1.1% |
| Butte County, CA | 6,510 | 0.5% |
| Sutter County, CA | 3,846 | 1.0% |
| Tehama County, CA | 67 | 0.0% |
| Placer County, CA | 1 | 0.0% |
Septic absorption fields
NRCS rating, share of Galt acres
Show as a table
| Category | Share of acres |
|---|---|
| Not limited | 0.0% |
| Somewhat limited | 0.0% |
| Very limited | 82.4% |
| Not rated | 17.6% |
Drainage, water table and flooding
Share of Galt acres
- Depth to seasonal high water table
- About 1.8 feet (22 in) (median where reported); within 18 inches on 16% of acres.
- Flooding
- Mapped as flooding on 49% of acres (<1% occasional, 4% frequent).
- Slope
- Typically 0–1% (median 1%).
- Topsoil organic matter
- Median 1.5%.
Drainage class
Show as a table
| Category | Share of acres |
|---|---|
| Excessively drained | 0.0% |
| Somewhat excessively drained | 0.0% |
| Well drained | 0.0% |
| Moderately well drained | 39.3% |
| Somewhat poorly drained | 33.5% |
| Poorly drained | 9.6% |
| Very poorly drained | 0.0% |
| Not rated | 17.6% |
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 | 0.0% |
| D: very slow infiltration (clayey, shallow or wet) | 77.1% |
| 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 | 5.3% |
| Not rated | 17.6% |
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 Galt (component kind "Series") in SSURGO: 43,694 acres.
- Method
- Shares are by mapped acres of Galt components. The profile comes from the single largest Galt component. Full methodology.