Soil series profile

LaFitte soil series

LaFitte is a very poorly drained soil with a muck surface, mapped on 310,351 acres in 17 counties across 3 states. Hydrologic group A/D.

#1079 by mapped area Typic Haplosaprists (Histosols)

Drainage class
Very poorly drained
99% of mapped acres
Hydrologic group
A/D
96% of mapped acres
Typical topsoil pH
6.3
slightly acidic · range 6.3–6.3
Mapped area
310k
acres in 17 counties, 3 states

Typical LaFitte profile

Texture and pH by depth

Typical LaFitte soil profile by depth 0 in 20 in 40 in 60 in 80 in 0–99 in · Oa Muck
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 LaFitte horizons (representative values)
Depth Texture pH Clay Sand Organic matter
0–99 in (Oa) Muck Not reported Not reported Not reported 50%

Representative values from the most extensive LaFitte map unit (Lafitte association, survey area LA045). 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 LaFitte soil means for gardens, lawns and septic systems

For gardens

Typical topsoil in LaFitte soils is slightly acidic: pH 6.3, the range most vegetables, flowers and lawn grasses prefer.

Organic muck or peat is the most common topsoil (96% of mapped LaFitte acres). It is rich and holds water, but is often wet, can be acidic, and settles when drained. The most common surface texture is muck (94% of mapped LaFitte acres).

99% of mapped LaFitte 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 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.

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 96% of the acres in mapped LaFitte 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.

Flooding is mapped on 99% of the acres (0% occasional, 99% 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 LaFitte soil is found

Mapped acres

LaFitte is mapped in Louisiana, Alabama and Florida.

Counties with the most mapped LaFitte soil
County Acres Share of county land
Terrebonne Parish, LA 62,112 8.6%
Plaquemines Parish, LA 43,531 11.6%
Iberia Parish, LA 42,436 12.1%
Lafourche Parish, LA 34,942 5.7%
Jefferson Parish, LA 33,364 19.5%
St. Bernard Parish, LA 32,294 13.3%
Vermilion Parish, LA 16,399 2.3%
Baldwin County, AL 13,392 1.4%
Orleans Parish, LA 9,622 9.4%
St. Tammany Parish, LA 7,067 1.3%
Mobile County, AL 5,369 0.8%
St. Charles Parish, LA 4,232 2.5%
St. Mary Parish, LA 2,160 0.5%
Cameron Parish, LA 1,721 0.2%
Franklin County, FL 1,280 0.3%
Calcasieu Parish, LA 427 0.1%
St. Martin Parish, LA 4 0.0%

Septic absorption fields

NRCS rating, share of LaFitte acres

Not limited 0%
Somewhat limited 0%
Very limited 96%
Not rated 4%
Septic tank absorption field rating across mapped LaFitte acres. Scale 0 to 100% of mapped land.
Show as a table
Septic tank absorption field rating across mapped LaFitte acres.
CategoryShare of acres
Not limited0.0%
Somewhat limited0.0%
Very limited96.0%
Not rated4.0%

Drainage, water table and flooding

Share of LaFitte acres

Depth to seasonal high water table
About 0 inches (median where reported); within 18 inches on 99% of acres.
Flooding
Mapped as flooding on 99% of acres (0% occasional, 99% frequent).
Slope
Typically 0–0% (median 0%).
Topsoil organic matter
Median 50%.

Drainage class

Excessively drained 0%
Somewhat excessively drained 0%
Well drained 0%
Moderately well drained 0%
Somewhat poorly drained 0%
Poorly drained 0%
Very poorly drained 99%
Not rated 2%
Drainage class across mapped LaFitte acres. Scale 0 to 100% of mapped land.
Show as a table
Drainage class across mapped LaFitte acres.
CategoryShare of acres
Excessively drained0.0%
Somewhat excessively drained0.0%
Well drained0.0%
Moderately well drained0.0%
Somewhat poorly drained0.0%
Poorly drained0.0%
Very poorly drained98.5%
Not rated1.5%

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 96%
B/D: D as is, B if drained <1%
C/D: D as is, C if drained 0%
Not rated 4%
Hydrologic soil group across mapped LaFitte acres. Scale 0 to 100% of mapped land.
Show as a table
Hydrologic soil group across mapped LaFitte 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 drained95.6%
B/D: D as is, B if drained0.4%
C/D: D as is, C if drained0.0%
Not rated4.0%

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 LaFitte (component kind "Series") in SSURGO: 310,351 acres.
Method
Shares are by mapped acres of LaFitte components. The profile comes from the single largest LaFitte component. Full methodology.

Independent reference site. No government affiliation or endorsement.

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