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.

#6547 by mapped area fine Aquic Durixererts (Vertisols)

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

Typical Galt soil profile by depth 0 in 10 in 20 in 30 in 40 in 50 in 0–5 in · A · pH 6.5 · 40% clay Clay 5–13 in · Bss1 · pH 6.5 · 42% clay Clay 13–22 in · Bss2 · pH 7.0 · 50% clay Clay 22–32 in · Bss3 · pH 8.0 · 50% clay Clay 32–60 in · 2Bkqm · pH 8.4 Cemented material
Depth to scale. More strongly shaded layers hold more clay. Horizon names are the soil survey's (A = topsoil, B = subsoil, C = parent material).
Show as a table
Typical Galt horizons (representative values)
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

Representative values from the most extensive Galt map unit (Galt clay, 0 to 1 percent slopes, MLRA 17, survey area CA077). Other map units of this series vary within the series range.

Hands holding dark garden soil
Stock photo for illustration, not a sample of this soil series. Credit on the Sources & method page.

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.

Generated from the mapped numbers above using fixed rules, not a site visit. See how these notes are written.

Where Galt soil is found

Mapped acres

Galt is mapped in California.

Counties with the most mapped Galt soil
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

Not limited 0%
Somewhat limited 0%
Very limited 82%
Not rated 18%
Septic tank absorption field rating across mapped Galt acres. Scale 0 to 100% of mapped land.
Show as a table
Septic tank absorption field rating across mapped Galt acres.
CategoryShare of acres
Not limited0.0%
Somewhat limited0.0%
Very limited82.4%
Not rated17.6%

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

Excessively drained 0%
Somewhat excessively drained 0%
Well drained 0%
Moderately well drained 39%
Somewhat poorly drained 34%
Poorly drained 10%
Very poorly drained 0%
Not rated 18%
Drainage class across mapped Galt acres. Scale 0 to 100% of mapped land.
Show as a table
Drainage class across mapped Galt acres.
CategoryShare of acres
Excessively drained0.0%
Somewhat excessively drained0.0%
Well drained0.0%
Moderately well drained39.3%
Somewhat poorly drained33.5%
Poorly drained9.6%
Very poorly drained0.0%
Not rated17.6%

Hydrologic soil group

A: fast infiltration (mostly sandy or gravelly) 0%
B: moderate infiltration 0%
C: slow infiltration 0%
D: very slow infiltration (clayey, shallow or wet) 77%
A/D: D as is, A if drained 0%
B/D: D as is, B if drained 0%
C/D: D as is, C if drained 5%
Not rated 18%
Hydrologic soil group across mapped Galt acres. Scale 0 to 100% of mapped land.
Show as a table
Hydrologic soil group across mapped Galt acres.
CategoryShare of acres
A: fast infiltration (mostly sandy or gravelly)0.0%
B: moderate infiltration0.0%
C: slow infiltration0.0%
D: very slow infiltration (clayey, shallow or wet)77.1%
A/D: D as is, A if drained0.0%
B/D: D as is, B if drained0.0%
C/D: D as is, C if drained5.3%
Not rated17.6%

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.

Independent reference site. No government affiliation or endorsement.

Full narrative description: USDA Official Soil Series Description for Galt.