Soil series profile

Singh soil series

Singh is a well drained soil with a ashy sandy loam surface, mapped on 67,883 acres in 3 counties in WA. Hydrologic group C.

#4729 by mapped area ashy over loamy-skeletal Alfic Vitrixerands (Andisols)

Drainage class: Well drained
Hydrologic group: C
Typical topsoil pH: 6.5
Mapped area: 68k

Typical Singh profile

Texture and pH by depth

Depth to scale. More strongly shaded layers hold more clay. Horizon names are the soil survey's (A = topsoil, B = subsoil, C = parent material).

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Typical Singh horizons (representative values)
Depth	Texture	pH	Clay	Sand	Organic matter
0–1 in (Oi)	Slightly decomposed plant material	5.0	Not reported	Not reported	75%
1–16 in (A)	Ashy sandy loam	6.5	5%	65%	5%
16–21 in (Bw)	Gravelly ashy fine sandy loam	6.5	10%	60%	2%
21–31 in (2Bt1)	Very gravelly fine sandy loam	6.5	18%	55%	0.5%
31–63 in (2Bt2)	Very cobbly loam	7.0	25%	40%	0.5%

Representative values from the most extensive Singh map unit (Singh ashy sandy loam, 0 to 20 percent slopes, survey area WA676). Other map units of this series vary within the series range.

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

What this means

What Singh soil means for gardens, lawns and septic systems

For gardens

Typical topsoil in Singh soils is slightly acidic: pH 6.5 (most land between 6.3 and 6.5), the range most vegetables, flowers and lawn grasses prefer.

Loamy topsoil (loam, silt loam and similar) covers 96% of mapped Singh acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is ashy sandy loam (85% of mapped Singh acres).

96% of mapped Singh acres is moderately well to excessively drained, which suits most garden plants.

For lawns and yards

On 96% 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 96% of the acres in mapped Singh soils very limited, 0% somewhat limited and 0% not limited (4% 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.

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

Where Singh soil is found

Mapped acres

Singh is mapped in Washington.

Counties with the most mapped Singh soil
County	Acres	Share of county land
Yakima County, WA	61,176	3.2%
Klickitat County, WA	6,484	0.6%
Kittitas County, WA	222	0.0%

Septic absorption fields

NRCS rating, share of Singh acres

Not limited 0%

Somewhat limited 0%

Very limited 96%

Not rated 4%

Septic tank absorption field rating across mapped Singh acres. Scale 0 to 100% of mapped land.

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Septic tank absorption field rating across mapped Singh acres.
Category	Share of acres
Not limited	0.0%
Somewhat limited	0.0%
Very limited	95.7%
Not rated	4.3%

Drainage, water table and flooding

Share of Singh 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 10–43% (median 10%).
Topsoil organic matter: Median 5%.

Drainage class

Excessively drained 0%

Somewhat excessively drained 0%

Well drained 96%

Moderately well drained 0%

Somewhat poorly drained 0%

Poorly drained 0%

Very poorly drained 0%

Not rated 4%

Drainage class across mapped Singh acres. Scale 0 to 100% of mapped land.

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Drainage class across mapped Singh acres.
Category	Share of acres
Excessively drained	0.0%
Somewhat excessively drained	0.0%
Well drained	95.7%
Moderately well drained	0.0%
Somewhat poorly drained	0.0%
Poorly drained	0.0%
Very poorly drained	0.0%
Not rated	4.3%

Hydrologic soil group

A: fast infiltration (mostly sandy or gravelly) 0%

B: moderate infiltration 0%

C: slow infiltration 96%

D: very slow infiltration (clayey, shallow or wet) 0%

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 0%

Not rated 4%

Hydrologic soil group across mapped Singh acres. Scale 0 to 100% of mapped land.

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Hydrologic soil group across mapped Singh acres.
Category	Share of acres
A: fast infiltration (mostly sandy or gravelly)	0.0%
B: moderate infiltration	0.0%
C: slow infiltration	95.7%
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	4.3%

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 Singh (component kind "Series") in SSURGO: 67,883 acres.
Method: Shares are by mapped acres of Singh components. The profile comes from the single largest Singh component. Full methodology.

Independent reference site. No government affiliation or endorsement.

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