Johnson County, Missouri

Survey Area MO101• Missouri

The dominant drainage class is Somewhat poorly drained and the dominant hydrologic group is C (slow infiltration, moderate 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 Johnson County, Missouri. 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
Sampsel silty clay loam, 5 to 9 percent slopes, severely eroded	79K	Somewhat poorly drained	C/D	Very limited	Very limited
Deepwater silt loam, 5 to 9 percent slopes, eroded	35K	Moderately well drained	C	Somewhat limited	Very limited
Mandeville silt loam, 5 to 9 percent slopes	32K	Well drained	C	Somewhat limited	Very limited
Haig silt loam, 0 to 2 percent slopes	29K	Poorly drained	D	Very limited	Very limited
Sampsel silty clay loam, 2 to 5 percent slopes	27K	Poorly drained	C/D	Very limited	Very limited
Arisburg silt loam, 1 to 5 percent slopes	24K	Somewhat poorly drained	C	Very limited	Very limited
Snead silty clay loam, warm, 5 to 14 percent slopes, eroded	23K	Moderately well drained	D	Very limited	Very limited
Deepwater silt loam, 2 to 5 percent slopes	23K	Moderately well drained	C	Somewhat limited	Very limited
Polo silt loam, 2 to 5 percent slopes	18K	Well drained	C	Very limited	Very limited
Norris channery silt loam, 5 to 14 percent slopes	16K	Well drained	D	Very limited	Very limited
Nodaway silt loam, heavy till, 0 to 2 percent slopes, occasionally flooded	16K	Moderately well drained	B	Very limited	Very limited
Gorin silt loam, 5 to 9 percent slopes, eroded	14K	Somewhat poorly drained	C	Very limited	Very limited
Zook silty clay loam, 0 to 2 percent slopes, frequently flooded	14K	Poorly drained	C/D	Very limited	Very limited
Hartwell silt loam, 1 to 3 percent slopes, eroded	13K	Somewhat poorly drained	C/D	Very limited	Very limited
Hartwell silt loam, 0 to 1 percent slopes	12K	Somewhat poorly drained	C/D	Very limited	Very limited
Nodaway silt loam, 1 to 3 percent slopes, occasionally flooded	11K	Moderately well drained	B	Very limited	Very limited
Dockery silty clay loam, 0 to 2 percent slopes, frequently flooded	11K	Somewhat poorly drained	C	Very limited	Very limited
Snead-Rock outcrop complex, warm, 5 to 14 percent slopes	11K	Moderately well drained	D	Very limited	Very limited
Weller silt loam, 2 to 5 percent slopes	10K	Moderately well drained	D	Very limited	Very limited
Snead-Rock outcrop complex, warm, 14 to 30 percent slopes	9K	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.

Mollisols

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

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.

Ultisols

Strongly weathered clay soils of the Southeast. Acidic and naturally low in nutrients. Clay subsoil can slow drainage.

What This Means

Building & Foundations

About 78% 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 100% of soils are rated "very limited" for septic absorption fields. Poorly drained soils can't absorb septic effluent effectively. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.

Gardening & Agriculture

Many soils hold water for extended periods. Raised beds are highly recommended to improve drainage for vegetables. Well-adapted native plants and water-loving species will do best in natural conditions.