Webb County, Texas

Survey Area TX479• 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 Vertisols — clay-rich soils that shrink and swell dramatically with moisture changes. 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 Webb 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
Maverick-Catarina complex, gently rolling	284K	Well drained	D	Very limited	Very limited
Copita fine sandy loam, 0 to 3 percent slopes	190K	Well drained	C	Somewhat limited	Very limited
Montell clay, 0 to 3 percent slopes	173K	Moderately well drained	D	Very limited	Very limited
Catarina clay, 0 to 2 percent slopes	163K	Moderately well drained	D	Very limited	Very limited
Moglia clay loam, 1 to 5 percent slopes	150K	Well drained	C	Somewhat limited	Very limited
Aguilares sandy clay loam, 0 to 3 percent slopes	123K	Well drained	B	Not limited	Somewhat limited
Duval very fine sandy loam, 0 to 3 percent slopes	111K	Well drained	B	Not limited	Somewhat limited
Brundage fine sandy loam, 0 to 1 percent slopes, occasionally flooded	106K	Moderately well drained	D	Very limited	Very limited
Jimenez-Quemado complex, undulating	96K	Well drained	D	Very limited	Very limited
Hebbronville loamy fine sand, 0 to 2 percent slopes	84K	Well drained	A	Not limited	Not limited
Brystal fine sandy loam, 0 to 3 percent slopes	80K	Well drained	B	Not limited	Somewhat limited
Tela sandy clay loam, 0 to 1 percent slopes, frequently flooded	77K	Well drained	B	Very limited	Very limited
Palafox clay loam, 0 to 3 percent slopes	76K	Well drained	C	Somewhat limited	Very limited
Monwebb clay, 0 to 1 percent slopes, occasionally flooded	69K	Moderately well drained	D	Very limited	Very limited
Delmita-Randado complex, 0 to 3 percent slopes	54K	Well drained	C	Very limited	Very limited
Cuevitas-Randado complex, 0 to 3 percent slopes	53K	Well drained	D	Very limited	Very limited
Viboras clay, 0 to 3 percent slopes	52K	Moderately well drained	D	Very limited	Very limited
Catarina clay, 0 to 1 percent slopes, occasionally flooded	37K	Moderately well drained	D	Very limited	Very limited
Verick fine sandy loam, 1 to 5 percent slopes	33K	Well drained	D	Very limited	Very limited
Dilley fine sandy loam, 0 to 3 percent slopes	28K	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.

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.

Entisols

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

Aridisols

Dry-climate soils with low organic matter. Often have caliche layers that make excavation difficult. Low shrink-swell is good for foundations.

Mollisols

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

What This Means

Building & Foundations

About 60% 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 80% 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.