Knox County, Texas

Survey Area TX275• Texas

The dominant drainage class is Well 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 Knox County, Texas. 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
Knoco-Badland complex, 1 to 12 percent slopes	100K	Well drained	D	Very limited	Very limited
Miles fine sandy loam, moist, 0 to 1 percent slopes	39K	Well drained	B	Somewhat limited	Somewhat limited
Cottonwood-Knoco complex, 3 to 20 percent slopes	38K	Well drained	D	Very limited	Very limited
Miles fine sandy loam, moist, 1 to 3 percent slopes	23K	Well drained	B	Somewhat limited	Somewhat limited
Grandfield-Devol complex, 0 to 3 percent slopes	22K	Well drained	B	Not limited	Very limited
Hollister clay loam, 0 to 1 percent slopes	22K	Well drained	C	Very limited	Very limited
Mangum clay, frequently flooded	21K	Well drained	D	Very limited	Very limited
Rotan clay loam, 0 to 1 percent slopes	20K	Well drained	C	Somewhat limited	Very limited
Knoco-Vernon complex, 3 to 12 percent slopes	17K	Well drained	D	Very limited	Very limited
Vernon clay, 3 to 8 percent slopes	17K	Well drained	D	Somewhat limited	Very limited
Tillman clay loam, 1 to 3 percent slopes	16K	Well drained	C	Very limited	Very limited
Tillman clay loam, 0 to 1 percent slopes	15K	Well drained	C	Very limited	Very limited
Sagerton clay loam, moist, 0 to 1 percent slopes	14K	Well drained	C	Somewhat limited	Very limited
Clairemont silt loam, 0 to 1 percent slopes, frequently flooded	13K	Well drained	B	Very limited	Very limited
Rotan-Winters-Miles complex, 0 to 1 percent slopes	12K	Well drained	C	Somewhat limited	Very limited
Wichita clay loam, 0 to 1 percent slopes	10K	Well drained	C	Somewhat limited	Very limited
Lincoln-Westola complex, occasionally flooded	10K	Somewhat excessively drained	A	Very limited	Very limited
Cosh fine sandy loam, 1 to 5 percent slopes	10K	Well drained	D	Very limited	Very limited
Altus fine sandy loam, warm, 0 to 1 percent slopes	9K	Well drained	B	Not limited	Very limited
Enterprise very fine sandy loam, 0 to 1 percent slopes	8K	Well drained	A	Not 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.

Alfisols

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

Mollisols

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

Entisols

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

What This Means

Building & Foundations

About 59% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, flood-prone areas. A geotechnical assessment is recommended before building.

Septic Systems

About 85% 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

Drainage is generally favorable for gardening. Adding compost and mulch will improve fertility and water retention. Test your soil's pH before planting — most vegetables prefer 6.0-7.0.