Soil series profile

Wynn soil series

Wynn is a well drained soil with a silt loam surface, mapped on 56,584 acres in 12 counties across 2 states. Hydrologic group C.

#5442 by mapped area fine Typic Hapludalfs (Alfisols)

Drainage class: Well drained
Hydrologic group: C
Typical topsoil pH: 6.2
Mapped area: 57k

Typical Wynn 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).

Show as a table

Typical Wynn horizons (representative values)
Depth	Texture	pH	Clay	Sand	Organic matter
0–8 in (Ap)	Silt loam	6.2	22%	26%	1.25%
8–12 in (Bt1)	Silty clay loam	6.6	35%	17%	0.7%
12–16 in (2Bt2)	Silty clay loam	6.7	35%	17%	0.7%
16–26 in (2Bt3)	Clay	7.0	41%	29%	0.3%
26–33 in (2BC)	Clay	7.4	41%	29%	0.3%
33–43 in (3Cr)	Bedrock	Not reported	Not reported	Not reported	Not reported

Representative values from the most extensive Wynn map unit (Wynn silt loam, 6 to 12 percent slopes, eroded, survey area OH017). 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 Wynn soil means for gardens, lawns and septic systems

For gardens

Typical topsoil in Wynn soils is slightly acidic: pH 6.2 (most land between 6.1 and 6.2), the range most vegetables, flowers and lawn grasses prefer.

Loamy topsoil (loam, silt loam and similar) covers 94% of mapped Wynn acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is silt loam (91% of mapped Wynn acres).

>99% of mapped Wynn acres is moderately well to excessively drained, which suits most garden plants.

For lawns and yards

On 94% 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 94% of the acres in mapped Wynn soils very limited, 0% somewhat limited and 0% not limited (6% 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 Wynn soil is found

Mapped acres

Wynn is mapped in Ohio and Indiana.

Counties with the most mapped Wynn soil
County	Acres	Share of county land
Butler County, OH	39,098	13.2%
Warren County, OH	9,222	3.6%
Franklin County, IN	3,036	1.2%
Preble County, OH	2,312	0.9%
Wayne County, IN	2,052	0.8%
Union County, IN	509	0.5%
Montgomery County, OH	127	0.0%
Hamilton County, OH	94	0.0%
Fayette County, IN	77	0.1%
Greene County, OH	28	0.0%
Clermont County, OH	26	0.0%
Clinton County, OH	2	0.0%

Septic absorption fields

NRCS rating, share of Wynn acres

Not limited 0%

Somewhat limited 0%

Very limited 94%

Not rated 6%

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

Show as a table

Septic tank absorption field rating across mapped Wynn acres.
Category	Share of acres
Not limited	0.0%
Somewhat limited	0.0%
Very limited	93.7%
Not rated	6.3%

Drainage, water table and flooding

Share of Wynn 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 4–8% (median 8%).
Topsoil organic matter: Median 1.2%.

Drainage class

Excessively drained 0%

Somewhat excessively drained 0%

Well drained >99%

Moderately well drained 0%

Somewhat poorly drained 0%

Poorly drained 0%

Very poorly drained 0%

Not rated <1%

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

Show as a table

Drainage class across mapped Wynn acres.
Category	Share of acres
Excessively drained	0.0%
Somewhat excessively drained	0.0%
Well drained	99.9%
Moderately well drained	0.0%
Somewhat poorly drained	0.0%
Poorly drained	0.0%
Very poorly drained	0.0%
Not rated	0.1%

Hydrologic soil group

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

B: moderate infiltration 0%

C: slow infiltration 91%

D: very slow infiltration (clayey, shallow or wet) 3%

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 6%

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

Show as a table

Hydrologic soil group across mapped Wynn acres.
Category	Share of acres
A: fast infiltration (mostly sandy or gravelly)	0.0%
B: moderate infiltration	0.0%
C: slow infiltration	90.7%
D: very slow infiltration (clayey, shallow or wet)	3.0%
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	6.3%

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 Wynn (component kind "Series") in SSURGO: 56,584 acres.
Method: Shares are by mapped acres of Wynn components. The profile comes from the single largest Wynn component. Full methodology.

Independent reference site. No government affiliation or endorsement.

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