Soil series profile

Conneaut soil series

Conneaut is a somewhat poorly drained soil with a silt loam surface, mapped on 35,505 acres in 3 counties across 2 states. Hydrologic group C/D.

#7501 by mapped area fine-silty Aeric Haplaquepts (Inceptisols)

Drainage class
Somewhat poorly drained
54% of mapped acres
Hydrologic group
C/D
99% of mapped acres
Typical topsoil pH
5.9
moderately acidic · range 4.8–5.9
Mapped area
36k
acres in 3 counties, 2 states

Typical Conneaut profile

Texture and pH by depth

Typical Conneaut soil profile by depth 0 in 10 in 20 in 30 in 40 in 50 in 0–9 in · H1 · pH 5.9 · 20% clay Silt loam 9–54 in · H2 · pH 5.9 · 28% clay Silty clay loam 54–60 in · H3 · pH 7.5 · 28% clay Silty clay loam
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 Conneaut horizons (representative values)
Depth Texture pH Clay Sand Organic matter
0–9 in (H1) Silt loam 5.9 20% 11% 2%
9–54 in (H2) Silty clay loam 5.9 28% 7% 0.75%
54–60 in (H3) Silty clay loam 7.5 28% 7% 0.4%

Representative values from the most extensive Conneaut map unit (Conneaut silt loam, 0 to 1 percent slopes, survey area OH085). 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 Conneaut soil means for gardens, lawns and septic systems

For gardens

Typical topsoil in Conneaut soils is moderately acidic: pH 5.9 (most land between 4.8 and 5.9). Many vegetables grow well here, and some gardens benefit from a little lime. Test before adding any.

Loamy topsoil (loam, silt loam and similar) covers 99% of mapped Conneaut acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is silt loam (99% of mapped Conneaut acres).

99% of mapped Conneaut 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 99% 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.

A seasonal high water table comes within 18 inches of the surface on 99% of mapped acres, often in spring. Basements, sump pumps and lawns in low spots feel it first.

For a septic system

For conventional septic absorption fields, NRCS rates 99% of the acres in mapped Conneaut soils very limited, 0% somewhat limited and 0% not limited (1% 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 Conneaut soil is found

Mapped acres

Conneaut is mapped in Ohio and Pennsylvania.

Counties with the most mapped Conneaut soil
County Acres Share of county land
Lake County, OH 19,116 13.0%
Ashtabula County, OH 13,942 3.1%
Erie County, PA 2,448 0.5%

Septic absorption fields

NRCS rating, share of Conneaut acres

Not limited 0%
Somewhat limited 0%
Very limited 99%
Not rated 1%
Septic tank absorption field rating across mapped Conneaut acres. Scale 0 to 100% of mapped land.
Show as a table
Septic tank absorption field rating across mapped Conneaut acres.
CategoryShare of acres
Not limited0.0%
Somewhat limited0.0%
Very limited98.6%
Not rated1.4%

Drainage, water table and flooding

Share of Conneaut acres

Depth to seasonal high water table
About 8 inches (median where reported); within 18 inches on 99% of acres.
Flooding
Not mapped as flooding on most acres.
Slope
Typically 0–3% (median 1%).
Topsoil organic matter
Median 2%.

Drainage class

Excessively drained 0%
Somewhat excessively drained 0%
Well drained 0%
Moderately well drained 0%
Somewhat poorly drained 54%
Poorly drained 45%
Very poorly drained 0%
Not rated 1%
Drainage class across mapped Conneaut acres. Scale 0 to 100% of mapped land.
Show as a table
Drainage class across mapped Conneaut acres.
CategoryShare of acres
Excessively drained0.0%
Somewhat excessively drained0.0%
Well drained0.0%
Moderately well drained0.0%
Somewhat poorly drained53.7%
Poorly drained44.9%
Very poorly drained0.0%
Not rated1.4%

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) 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 99%
Not rated 1%
Hydrologic soil group across mapped Conneaut acres. Scale 0 to 100% of mapped land.
Show as a table
Hydrologic soil group across mapped Conneaut 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)0.0%
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 drained98.6%
Not rated1.4%

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 Conneaut (component kind "Series") in SSURGO: 35,505 acres.
Method
Shares are by mapped acres of Conneaut components. The profile comes from the single largest Conneaut component. Full methodology.

Independent reference site. No government affiliation or endorsement.

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