St. Charles Parish, Louisiana

Survey Area LA089• Louisiana

The dominant drainage class is Very poorly drained and the dominant hydrologic group is D (very slow infiltration, high runoff). The most common soil order is Inceptisols — young soils with minimal horizon development but more than Entisols. This report summarizes the major soil map units across the survey area to help you understand what to expect when buying, building, or gardening in St. Charles Parish, Louisiana. Search your address to find the exact soil composition, drainage, and series details at your specific location.

Soil Map Unit	Acres	Drainage	Hydro Group	Dwellings	Septic
Water	90K			Not rated	Not rated
Kenner muck, 0 to 1 percent slopes, very frequently flooded	56K	Very poorly drained	D	Very limited	Very limited
Barbary muck, 0 to 1 percent slopes, frequently flooded	29K	Very poorly drained	D	Very limited	Very limited
Cancienne silt loam, 0 to 1 percent slopes	9K	Somewhat poorly drained	C	Somewhat limited	Very limited
Cancienne and Carville soils, frequently flooded	8K	Somewhat poorly drained	C	Very limited	Very limited
Harahan clay, 0 to 1 percent slopes	8K	Poorly drained	D	Very limited	Very limited
Cancienne silty clay loam, 0 to 1 percent slopes	8K	Somewhat poorly drained	C	Somewhat limited	Very limited
Fausse clay, 0 to 1 percent slopes, frequently flooded	7K	Very poorly drained	D	Very limited	Very limited
Schriever clay, 0 to 1 percent slopes, frequently flooded	6K	Poorly drained	D	Very limited	Very limited
Lafitte muck, 0 to 0.2 percent slopes, very frequently flooded	5K	Very poorly drained	A/D	Very limited	Very limited
Cancienne silty clay loam, frequently flooded	5K	Somewhat poorly drained	C	Very limited	Very limited
Maurepas muck, 0 to 1 percent slopes, frequently flooded	4K	Very poorly drained	A/D	Very limited	Very limited
Allemands-Larose association	4K	Very poorly drained	C/D	Very limited	Very limited
Thibaut clay, 0 to 1 percent slopes	4K	Poorly drained	D	Very limited	Very limited
Urban land	4K			Not rated	Not rated
Schriever silty clay loam, 0 to 1 percent slopes	3K	Poorly drained	D	Very limited	Very limited
Schriever clay, 0 to 1 percent slopes, rarely flooded	3K	Poorly drained	D	Very limited	Very limited
Allemands clay, drained	2K	Poorly drained	D	Very limited	Very limited
Allemands muck, 0 to 0.2 percent slopes, very frequently flooded	2K	Very poorly drained	A/D	Very limited	Very limited
Cancienne-Harahan-Allemands complex, drained	1K	Poorly drained	C	Very limited	Very limited

Soil Orders in This Area

The USDA classifies every soil into one of 12 soil orders. Here are the dominant orders found in this survey area.

Inceptisols

Young but developing soils found in mountains and river terraces. Variable properties — check drainage and bedrock depth.

Histosols

Organic peat and muck soils formed in wetlands. Very poor for building (compressible) and septic. Often in regulated wetlands.

Entisols

Young soils with little development — found on floodplains, dunes, and steep slopes. Properties vary widely by setting.

Vertisols

High-clay soils that shrink and swell dramatically. Fertile but challenging for foundations and septic systems.

What This Means

Building & Foundations

About 57% of soils are rated "very limited" for dwellings with basements. Specific challenges include poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.

Septic Systems

About 63% of soils are rated "very limited" for septic absorption fields. Poorly drained soils can't absorb septic effluent effectively. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.

Gardening & Agriculture

Many soils hold water for extended periods. Raised beds are highly recommended to improve drainage for vegetables. Well-adapted native plants and water-loving species will do best in natural conditions.