Soil series profile

Grant soil series

Grant is a well drained soil with a silt loam surface, mapped on 626,332 acres in 32 counties across 2 states. Hydrologic group B.

#409 by mapped area fine-silty Udic Argiustolls (Mollisols)

Drainage class: Well drained
Hydrologic group: B
Typical topsoil pH: 7.0
Mapped area: 626k

Typical Grant 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 Grant horizons (representative values)
Depth	Texture	pH	Clay	Sand	Organic matter
0–12 in (Ap)	Silt loam	7.0	23%	19%	2%
12–16 in (BA)	Silt loam	7.0	22%	20%	2%
16–32 in (Bt)	Silty clay loam	7.3	29%	16%	0.75%
32–47 in (BC)	Silt loam	7.9	25%	15%	0.75%
47–59 in (C)	Silt loam	7.9	23%	23%	0.75%
59–72 in (Cr)	Bedrock	Not reported	Not reported	Not reported	Not reported

Representative values from the most extensive Grant map unit (Grant silt loam, 1 to 3 percent slopes, survey area OK003). 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 Grant soil means for gardens, lawns and septic systems

For gardens

Typical topsoil in Grant soils is neutral: pH 7.0, the range most vegetables, flowers and lawn grasses prefer.

Loamy topsoil (loam, silt loam and similar) covers 94% of mapped Grant acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is silt loam (84% of mapped Grant acres).

100% of mapped Grant 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 0% of the acres in mapped Grant soils very limited, 94% somewhat limited and 0% not limited (6% not rated, such as urban land, pits or water).

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 Grant soil is found

Mapped acres

Grant is mapped in Oklahoma and Kansas.

Counties with the most mapped Grant soil
County	Acres	Share of county land
Alfalfa County, OK	88,219	15.9%
McClain County, OK	71,296	19.6%
Garfield County, OK	70,119	10.4%
Grady County, OK	58,295	8.3%
Caddo County, OK	56,760	7.0%
Harper County, KS	55,349	10.8%
Barber County, KS	51,575	7.1%
Blaine County, OK	31,007	5.2%
Grant County, OK	30,762	4.8%
Canadian County, OK	26,079	4.6%
Major County, OK	24,720	4.1%
Woods County, OK	24,578	3.0%
Custer County, OK	13,878	2.2%
Noble County, OK	10,628	2.3%
Cleveland County, OK	4,746	1.4%
Kingfisher County, OK	4,626	0.8%
Logan County, OK	550	0.1%
Sumner County, KS	546	0.1%
Pawnee County, OK	501	0.1%
Kingman County, KS	460	0.1%
Kay County, OK	356	0.1%
Osage County, OK	324	0.0%
Comanche County, KS	216	0.0%
Oklahoma County, OK	201	0.0%
Pottawatomie County, OK	118	0.0%
Payne County, OK	100	0.0%
Garvin County, OK	78	0.0%
Jefferson County, OK	65	0.0%
Stephens County, OK	62	0.0%
Carter County, OK	53	0.0%
Washita County, OK	38	0.0%
Okfuskee County, OK	26	0.0%

Septic absorption fields

NRCS rating, share of Grant acres

Not limited 0%

Somewhat limited 94%

Very limited 0%

Not rated 6%

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

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Septic tank absorption field rating across mapped Grant acres.
Category	Share of acres
Not limited	0.0%
Somewhat limited	94.2%
Very limited	0.0%
Not rated	5.8%

Drainage, water table and flooding

Share of Grant 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 2–6% (median 4%).
Topsoil organic matter: Median 2%.

Drainage class

Excessively drained 0%

Somewhat excessively drained 0%

Well drained 100%

Moderately well drained 0%

Somewhat poorly drained 0%

Poorly drained 0%

Very poorly drained 0%

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

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Drainage class across mapped Grant acres.
Category	Share of acres
Excessively drained	0.0%
Somewhat excessively drained	0.0%
Well drained	100.0%
Moderately well drained	0.0%
Somewhat poorly drained	0.0%
Poorly drained	0.0%
Very poorly drained	0.0%

Hydrologic soil group

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

B: moderate infiltration >99%

C: slow infiltration 0%

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 <1%

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

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Hydrologic soil group across mapped Grant acres.
Category	Share of acres
A: fast infiltration (mostly sandy or gravelly)	0.0%
B: moderate infiltration	99.7%
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	0.3%

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 Grant (component kind "Series") in SSURGO: 626,332 acres.
Method: Shares are by mapped acres of Grant components. The profile comes from the single largest Grant component. Full methodology.

Independent reference site. No government affiliation or endorsement.

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