Uvalde County, Texas

Survey Area TX463• 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 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 Uvalde 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
Rock outcrop-Real association, steep	119K		D	Very limited	Very limited
Knippa clay, 0 to 1 percent slopes	85K	Well drained	C	Somewhat limited	Very limited
Rock Outcrop-Ector, warm, complex, 10 to 40 percent slopes	80K		D	Very limited	Very limited
Uvalde clay loam, 0 to 1 percent slopes	73K	Well drained	C	Somewhat limited	Very limited
Olmos and Langtry soils undifferentiated, 1 to 8 percent slopes	52K	Well drained	D	Very limited	Very limited
Ector-Rock outcrop complex, warm, 5 to 20 percent slopes	50K	Well drained	D	Very limited	Very limited
Real and Eckrant soils, undulating	46K	Well drained	D	Very limited	Very limited
Olmos very cobbly loam, 1 to 8 percent slopes	43K	Well drained	D	Very limited	Very limited
Montell clay, 0 to 1 percent slopes	42K	Moderately well drained	D	Very limited	Very limited
Ector soils, warm, 1 to 8 percent slopes	40K	Well drained	D	Very limited	Very limited
Uvalde clay loam, 1 to 3 percent slopes	35K	Well drained	C	Somewhat limited	Very limited
Speck association, 1 to 8 percent slopes	28K	Well drained	D	Very limited	Very limited
Hindes-Yologo complex, 1 to 8 percent slopes	24K	Well drained	C	Not limited	Very limited
Dev extremely gravelly clay loam, 0 to 3 percent slopes, frequently flooded	22K	Well drained	A	Very limited	Very limited
Eckrant soils, undulating	19K	Well drained	D	Very limited	Very limited
Pratley clay, 0 to 3 percent slopes	19K	Well drained	C	Very limited	Very limited
Knippa clay, 1 to 3 percent slopes	19K	Well drained	C	Somewhat limited	Very limited
Atco loam, 0 to 1 percent slopes	16K	Well drained	B	Not limited	Somewhat limited
Kavett clay, 0 to 3 percent slopes	14K	Well drained	D	Very limited	Very limited
Castroville clay loam, 0 to 1 percent slopes	13K	Well drained	B	Somewhat limited	Somewhat 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.

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.

Alfisols

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

What This Means

Building & Foundations

About 68% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, 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

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.