Johnson County, Texas

Survey Area TX251• 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 Alfisols — moderately leached forest soils with a clay-enriched subsoil. 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 Johnson 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
Aledo-Bolar association, 1 to 8 percent slopes	70K	Well drained	D	Very limited	Very limited
Heiden clay, 1 to 3 percent slopes	53K	Well drained	D	Very limited	Very limited
Crosstell fine sandy loam, 3 to 8 percent slopes	47K	Moderately well drained	D	Very limited	Very limited
Sanger clay, 1 to 3 percent slopes	34K	Well drained	D	Very limited	Very limited
Crosstell fine sandy loam, 1 to 3 percent slopes	23K	Moderately well drained	D	Very limited	Very limited
Ponder clay loam, 1 to 3 percent slopes	16K	Moderately well drained	C	Very limited	Very limited
Rader fine sandy loam, 0 to 3 percent slopes	15K	Moderately well drained	B	Somewhat limited	Very limited
Ferris-Heiden complex, 2 to 5 percent slopes	13K	Well drained	D	Very limited	Very limited
Bolar clay loam, 3 to 8 percent slopes	13K	Well drained	C	Somewhat limited	Very limited
Slidell clay, 1 to 3 percent slopes	13K	Moderately well drained	D	Very limited	Very limited
Bolar-Aledo complex, 3 to 20 percent slopes	9K	Well drained	D	Very limited	Very limited
Frio silty clay, 0 to 1 percent slopes, occasionally flooded	9K	Well drained	C	Very limited	Very limited
Bolar clay loam, 1 to 3 percent slopes	8K	Well drained	C	Very limited	Very limited
Gasil fine sandy loam, 1 to 3 percent slopes	8K	Well drained	B	Not limited	Somewhat limited
Brackett-Rock outcrop complex, 5 to 30 percent slopes	7K	Well drained	D	Very limited	Very limited
Navo clay loam, 2 to 5 percent slopes	7K	Moderately well drained	D	Very limited	Very limited
Lindale clay loam, 1 to 3 percent slopes	7K	Well drained	C	Somewhat limited	Very limited
Gasil fine sandy loam, 3 to 8 percent slopes	7K	Well drained	B	Not limited	Somewhat limited
Sanger clay, 3 to 5 percent slopes	6K	Well drained	D	Very limited	Very limited
Houston Black clay, 1 to 3 percent slopes	6K	Moderately well drained	D	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.

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.

Vertisols

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

Inceptisols

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

What This Means

Building & Foundations

About 86% 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 96% 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.