Soil series profile

Ocilla soil series

Ocilla is a somewhat poorly drained soil with a loamy fine sand surface, mapped on 446,415 acres in 97 counties across 6 states. Hydrologic group B/D.

#669 by mapped area loamy Aquic Arenic Paleudults (Ultisols)

Drainage class
Somewhat poorly drained
97% of mapped acres
Hydrologic group
B/D
63% of mapped acres
Typical topsoil pH
5.0
very strongly acidic · range 5.0–5.5
Mapped area
446k
acres in 97 counties, 6 states

Typical Ocilla profile

Texture and pH by depth

Typical Ocilla soil profile by depth 0 in 20 in 40 in 60 in 0–28 in · H1 · pH 5.0 · 7% clay Loamy fine sand 28–59 in · H2 · pH 5.0 · 25% clay Sandy clay loam 59–67 in · H3 · pH 5.0 · 28% clay Sandy 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 Ocilla horizons (representative values)
Depth Texture pH Clay Sand Organic matter
0–28 in (H1) Loamy fine sand 5.0 7% 86% 1.5%
28–59 in (H2) Sandy clay loam 5.0 25% 57% 0.25%
59–67 in (H3) Sandy clay loam 5.0 28% 55% 0.25%

Representative values from the most extensive Ocilla map unit (Ocilla complex, survey area GA613). 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 Ocilla soil means for gardens, lawns and septic systems

For gardens

Typical topsoil in Ocilla soils is very strongly acidic: pH 5.0 (most land between 5.0 and 5.5). Most vegetables and lawn grasses do best around 6.0 to 7.0, so lime is often needed; blueberries, azaleas and rhododendrons like it as it is.

Sandy topsoil covers 100% of mapped Ocilla acres. It drains fast and warms early in spring, but dries out and loses nutrients quickly: mulch, compost and steady watering help. The most common surface texture is loamy sand (43% of mapped Ocilla acres).

97% of mapped Ocilla 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.

For a septic system

For conventional septic absorption fields, NRCS rates 99% of the acres in mapped Ocilla soils very limited, 1% somewhat limited and 0% not limited.

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 9% of the acres (3% occasional, 2% 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 Ocilla soil is found

Mapped acres

Ocilla is mapped in Georgia, South Carolina, Florida, Alabama, North Carolina and Mississippi. The 60 counties with the most Ocilla acres:

Counties with the most mapped Ocilla soil
County Acres Share of county land
Colleton County, SC 28,897 4.9%
Hampton County, SC 22,420 6.4%
Liberty County, GA 21,207 6.5%
Chatham County, GA 19,025 7.0%
Berkeley County, SC 16,503 2.4%
Pitt County, NC 16,214 4.3%
Madison County, FL 15,671 3.5%
Jasper County, SC 15,029 3.7%
Bryan County, GA 13,571 4.9%
Baker County, FL 12,725 3.4%
Irwin County, GA 11,330 5.7%
Orangeburg County, SC 10,262 1.5%
Allendale County, SC 8,581 2.3%
Washington County, FL 6,924 1.8%
Emanuel County, GA 6,920 1.8%
Decatur County, GA 6,906 2.2%
Bullock County, AL 6,899 2.0%
Dorchester County, SC 6,715 1.9%
Tift County, GA 6,237 4.1%
McIntosh County, GA 6,179 2.3%
Grady County, GA 6,004 2.5%
Barbour County, AL 5,933 1.2%
Colquitt County, GA 5,648 1.9%
Bamberg County, SC 5,522 2.4%
Long County, GA 5,501 2.2%
Wheeler County, GA 5,464 3.2%
Seminole County, GA 5,380 4.0%
Jackson County, MS 4,927 1.2%
Jenkins County, GA 4,916 2.5%
Screven County, GA 4,864 1.4%
Ben Hill County, GA 4,749 3.4%
Clarendon County, SC 4,707 1.2%
Miller County, GA 4,688 2.9%
Harrison County, MS 4,629 1.2%
Union County, FL 4,556 2.9%
Worth County, GA 4,520 1.4%
Laurens County, GA 4,496 1.0%
Bladen County, NC 4,357 0.9%
Leon County, FL 4,322 1.0%
Early County, GA 4,076 1.4%
Appling County, GA 3,831 1.2%
Jeff Davis County, GA 3,831 1.8%
Clay County, FL 3,747 1.0%
Hamilton County, FL 3,700 1.1%
Macon County, AL 3,612 1.1%
Suwannee County, FL 3,547 0.8%
Russell County, AL 3,392 0.9%
Washington County, GA 3,360 0.9%
Brooks County, GA 3,260 1.2%
Thomas County, GA 3,132 1.1%
Nassau County, FL 3,096 0.8%
Bradford County, FL 3,004 1.6%
Burke County, GA 2,961 0.6%
Crenshaw County, AL 2,782 0.8%
Gulf County, FL 2,759 0.7%
Jefferson County, GA 2,754 0.9%
Houston County, AL 2,482 0.8%
Toombs County, GA 2,388 1.1%
Lee County, GA 2,252 1.1%
Gadsden County, FL 2,195 0.7%

Septic absorption fields

NRCS rating, share of Ocilla acres

Not limited 0%
Somewhat limited 1%
Very limited 99%
Septic tank absorption field rating across mapped Ocilla acres. Scale 0 to 100% of mapped land.
Show as a table
Septic tank absorption field rating across mapped Ocilla acres.
CategoryShare of acres
Not limited0.0%
Somewhat limited1.3%
Very limited98.7%

Drainage, water table and flooding

Share of Ocilla acres

Depth to seasonal high water table
About 1.7 feet (20 in) (median where reported); within 18 inches on 18% of acres.
Flooding
Mapped as flooding on 9% of acres (3% occasional, 2% frequent).
Slope
Typically 1–3% (median 1%).
Topsoil organic matter
Median 1.5%.

Drainage class

Excessively drained 0%
Somewhat excessively drained 0%
Well drained 0%
Moderately well drained 3%
Somewhat poorly drained 97%
Poorly drained 0%
Very poorly drained 0%
Drainage class across mapped Ocilla acres. Scale 0 to 100% of mapped land.
Show as a table
Drainage class across mapped Ocilla acres.
CategoryShare of acres
Excessively drained0.0%
Somewhat excessively drained0.0%
Well drained0.0%
Moderately well drained3.3%
Somewhat poorly drained96.7%
Poorly drained0.0%
Very poorly drained0.0%

Hydrologic soil group

A: fast infiltration (mostly sandy or gravelly) 0%
B: moderate infiltration 1%
C: slow infiltration <1%
D: very slow infiltration (clayey, shallow or wet) 0%
A/D: D as is, A if drained 36%
B/D: D as is, B if drained 63%
C/D: D as is, C if drained <1%
Hydrologic soil group across mapped Ocilla acres. Scale 0 to 100% of mapped land.
Show as a table
Hydrologic soil group across mapped Ocilla acres.
CategoryShare of acres
A: fast infiltration (mostly sandy or gravelly)0.0%
B: moderate infiltration1.3%
C: slow infiltration0.2%
D: very slow infiltration (clayey, shallow or wet)0.0%
A/D: D as is, A if drained35.8%
B/D: D as is, B if drained62.6%
C/D: D as is, C if drained0.1%

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 Ocilla (component kind "Series") in SSURGO: 446,415 acres.
Method
Shares are by mapped acres of Ocilla components. The profile comes from the single largest Ocilla component. Full methodology.

Independent reference site. No government affiliation or endorsement.

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