Seminole County, Oklahoma

Survey Area OK133• Oklahoma

The dominant drainage class is Well drained and the dominant hydrologic group is C (slow infiltration, moderate runoff). The most common soil order is Mollisols — grassland soils with a thick, dark, fertile topsoil rich in organic matter. 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 Seminole County, Oklahoma. 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
Stephenville-Darnell complex, 5 to 12 percent slopes	73K	Well drained	C	Somewhat limited	Very limited
Stephenville-Darnell complex, 5 to 15 percent slopes, severely eroded	36K	Well drained	C	Somewhat limited	Very limited
Seminole, Chickasha, and Mulhall soils, 3 to 8 percent slopes, severely eroded	35K	Well drained	B	Not limited	Very limited
Niotaze-Wewoka complex, 3 to 12 percent slopes	27K	Somewhat poorly drained	D	Very limited	Very limited
Niotaze-Darnell complex, 8 to 30 percent slopes	25K	Somewhat poorly drained	D	Very limited	Very limited
Seminole loam, 3 to 5 percent slopes, eroded	19K	Moderately well drained	C/D	Very limited	Very limited
Stephenville fine sandy loam, 3 to 5 percent slopes	19K	Well drained	C	Somewhat limited	Very limited
Gowton loam, 0 to 1 percent slopes, occasionally flooded	15K	Well drained	B	Very limited	Very limited
Gowton fine sandy loam, 0 to 1 percent slopes, frequently flooded	13K	Well drained	B	Very limited	Very limited
Seminole-Gowton complex, 0 to 12 percent slopes, frequently flooded	12K	Moderately well drained	C/D	Very limited	Very limited
Konawa fine sandy loam, 3 to 8 percent slopes, eroded	11K	Well drained	B	Not limited	Very limited
Grainola-Lucien complex, 5 to 12 percent slopes	9K	Well drained	D	Somewhat limited	Very limited
Konawa fine sandy loam, 3 to 8 percent slopes, gullied	9K	Well drained	B	Not limited	Somewhat limited
Water	8K		D	Not rated	Not rated
Eufaula-Dougherty complex, 5 to 15 percent slopes	7K	Well drained	B	Somewhat limited	Very limited
Pulaski fine sandy loam, 0 to 1 percent slopes, occasionally flooded	6K	Well drained	A	Very limited	Very limited
Konawa fine sandy loam, 3 to 5 percent slopes	6K	Well drained	B	Not limited	Very limited
Grainola and Aydelotte soils, 3 to 8 percent slopes, severely eroded	6K	Well drained	D	Very limited	Very limited
Yahola fine sandy loam, 0 to 1 percent slopes, occasionally flooded	5K	Well drained	A	Very limited	Very limited
Stephenville fine sandy loam, 1 to 3 percent slopes	5K	Well drained	C	Somewhat 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.

Mollisols

Fertile grassland soils with thick, dark topsoil. Among the best for agriculture, building, and gardening.

Alfisols

Moderately weathered forest soils with clay-enriched subsoil. Productive for agriculture, generally good for building and septic.

Inceptisols

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

What This Means

Building & Foundations

About 37% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.

Septic Systems

About 95% of soils are rated "very limited" for septic absorption fields. Despite good drainage overall, limitations may stem from shallow bedrock, steep slopes, or seasonal conditions. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.

Gardening & Agriculture

Well-drained soils on sloped terrain — good for most plants but watch for erosion. Terracing, contour planting, and mulching help retain moisture and topsoil. Drip irrigation is more effective than sprinklers on slopes.