Willcox Area, Arizona Parts of Cochise and Graham Counties

Survey Area AZ665• Arizona

The dominant drainage class is Well drained and the dominant hydrologic group is C (slow infiltration, moderate runoff). The most common soil order is Aridisols — dry-climate soils with limited organic matter and often calcium carbonate accumulation. 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 Willcox Area, Arizona Parts of Cochise and Graham Counties. 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	36K		D	Not rated	Not rated
Tubac sandy clay loam, 0 to 2 percent slopes	33K	Well drained	C	Somewhat limited	Very limited
Pima loam	31K	Well drained	C	Not limited	Very limited
Gothard fine sandy loam	31K	Moderately well drained	C	Somewhat limited	Very limited
Tubac sandy loam, 0 to 2 percent slopes	20K	Well drained	C	Somewhat limited	Very limited
Crot sandy loam	19K	Somewhat poorly drained	D	Very limited	Very limited
Sonoita sandy loam, 0 to 2 percent slopes	19K	Well drained	A	Not limited	Not limited
Karro loam	16K	Well drained	C	Somewhat limited	Very limited
Grabe loam	15K	Well drained	C	Not limited	Very limited
McAllister loam	13K	Well drained	C	Somewhat limited	Very limited
Elfrida silty clay loam	13K	Well drained	C	Somewhat limited	Very limited
Forrest loam, 0 to 2 percent slopes	11K	Well drained	C	Somewhat limited	Very limited
Guest clay loam	11K	Well drained	C	Very limited	Very limited
Grabe sandy loam	10K	Well drained	C	Not limited	Very limited
Comoro sandy loam, 0 to 2 percent slopes	10K	Well drained	A	Not limited	Very limited
Stewart loam	8K	Somewhat poorly drained	D	Not limited	Very limited
Cogswell clay loam	8K	Well drained	C	Somewhat limited	Very limited
Frye sandy loam	5K	Well drained	D	Very limited	Very limited
Torriorthents, hummocky	5K	Excessively drained		Not rated	Not rated
Duncan loam	5K	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.

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.

Entisols

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

What This Means

Building & Foundations

Most soils are generally favorable for residential construction. Standard foundations are usually viable, though site-specific evaluation is always recommended.

Septic Systems

About 81% 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.