Solano County, California

Survey Area CA095• California

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 Solano County, California. 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
Water	54K		D	Not rated	Not rated
Capay clay, 0 percent slopes, MLRA 17	38K	Moderately well drained	C	Very limited	Very limited
Capay silty clay loam, 0 percent slopes, MLRA 17	29K	Moderately well drained	C	Very limited	Very limited
Yolo silty clay loam, 0 to 2 percent slopes, MLRA 17	27K	Well drained	B	Very limited	Very limited
Antioch-San Ysidro complex, 0 to 2 percent slopes	21K	Moderately well drained	D	Very limited	Very limited
Diablo-Ayar clays, 9 to 30 percent slopes, eroded	21K	Well drained	C	Very limited	Very limited
Dibble-Los Osos clay loams, 30 to 50 percent slopes, eroded	19K	Well drained	D	Very limited	Very limited
San Ysidro sandy loam, 0 to 2 percent slopes	18K	Moderately well drained	D	Somewhat limited	Very limited
Clear Lake clay, 0 to 2 percent slopes, MLRA 17	16K	Poorly drained	C/D	Very limited	Very limited
Reyes silty clay	15K	Poorly drained	D	Very limited	Very limited
Brentwood clay loam, 0 to 2 percent slopes	15K	Well drained	C	Somewhat limited	Very limited
Tamba mucky clay, MLRA 16	15K	Very poorly drained	C	Very limited	Very limited
Dibble-Los Osos clay loams, 9 to 30 percent slopes	14K	Well drained	D	Very limited	Very limited
Joice muck, MLRA 16	13K	Very poorly drained	A/D	Very limited	Very limited
Maymen-Los Gatos loams, 15 to 75 percent slopes, severe ly eroded	13K	Somewhat excessively drained	D	Very limited	Very limited
Millsholm loam, 15 to 65 percent slopes, eroded, MLRA 15	11K	Well drained	D	Very limited	Very limited
Yolo loam, 0 to 4 percent slopes, MLRA 17	11K	Well drained	B	Very limited	Somewhat limited
Solano loam	9K	Moderately well drained	D	Somewhat limited	Very limited
Hambright loam, 15 to 40 percent slopes	9K	Well drained	D	Very limited	Very limited
Rincon clay loam, 0 to 2 percent slope	9K	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.

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.

Inceptisols

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

Vertisols

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

Entisols

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

What This Means

Building & Foundations

About 72% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.

Septic Systems

About 82% 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.