Washington County Soil Data
Washington County, Ohio
USDA SSURGO / PHZMAvg pH
5.7
Texture
Stony loam
Drainage
Well drained
Organic Matter
5.9%
Hydrologic Group
A
Data Story
About Soil in Washington County, Ohio
Stony Loam and Acidic Alfisols
Washington County features Alfisols with a dominant stony loam texture and a pH of 5.69. This is more acidic than both the national median and the Ohio state average. The stony nature of the soil reflects the rugged, scenic topography of this river-valley region.
Silty Composition with Stone Fractions
The soil is comprised of 51.5% silt, 23.5% sand, and 19.5% clay. These proportions create a silty profile that is often interrupted by stones, which can make deep tilling a challenge. However, the silt provides a smooth consistency that holds nutrients effectively where stones are absent.
High Organic Matter and Nutrients
Washington County boasts an impressive 5.86% organic matter, far surpassing the state average of 4.85%. While its available water capacity is lower than average at 0.170 in/in, the rich organic content acts as a natural fertilizer. This soil is naturally charged with the biological components needed for healthy plant life.
Rapid Drainage for River Terrain
Classified as well-drained and belonging to hydrologic group A, the soil manages water quickly and efficiently. This is vital in the hilly terrain of Washington County to prevent heavy erosion during storms. It provides a stable base for development and reduces the risk of root rot in agricultural settings.
Hardy Growth in Zone 6b
In zone 6b, the combination of high organic matter and well-drained soil is perfect for timber and deep-rooted perennials. Gardeners should consider adding lime to raise the pH for vegetables like peppers or tomatoes. Your garden will thrive here if you manage the acidity and rocky texture.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Group A — Low Runoff
Sandy, well-drained soils with high infiltration rates. Water moves quickly through the soil profile. Lowest runoff potential when thoroughly wetted.
Drainage Class
Well drained
Water is removed from the soil readily but not rapidly. Optimal for most plants and construction.
Soil Profile
Dominant texture: Stony loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Acidic Soil Detected
Your county's average pH is 5.7. These products help balance soil pH for healthier grass.
Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Washington County have?
Washington County's soil is classified as Stony loam. This indicates the relative proportions of sand, silt, and clay — 23% sand, 52% silt, and 19% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Washington County's soil acidic or alkaline?
Washington County's soil has a pH of 5.7, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for Washington County?
Washington County has a dominant drainage class of "Well drained." Well-drained soils allow excess water to move through quickly, reducing waterlogging risk and supporting most field and garden crops.
What crops or plants grow well in Washington County's soil?
Based on Washington County's Stony loam texture, pH of 5.7, and Well drained, the soil is well suited for vegetables, grains, and most field crops, row crops and vegetable gardens, most annual and perennial crops.
What USDA soil order is found in Washington County?
Washington County's dominant soil order is Alfisols. Alfisols are moderate to high base-status soils with a clay-enriched subsoil. They support productive forests and cropland across temperate regions.
Soil & Planting Advisory: Washington County
Soil Verdict
Washington County is in USDA hardiness zone 6b, a moderate climate zone. where winter lows can reach -5°F. Freeze-thaw cycles are moderate; soil biology slows in winter but recovers reliably in spring, supporting a broad range of plants.
Planting Guidance
A wide plant palette is possible: deciduous trees, most shrubs, cool-season vegetables, and many perennials thrive here. Winter protection (mulch, burlap wraps) helps push the zone boundary for desired species. Always match plant selections to the specific microclimate of your property — low spots, slopes, and wind exposure can shift effective hardiness by half a zone.
Soil Implications
Moderate freeze-thaw cycles naturally aerate the soil but can also cause compaction in clay-heavy areas; annual core aeration is beneficial. Organic matter amendments decompose at a moderate pace — aim for 3-5% organic content for optimal fertility. When soil temperatures drop below freezing, microbial nitrogen cycling stops; spring fertilization is more effective than late-fall application.
Regional Context
Washington County closely matches the Ohio average hardiness conditions.
Planning your lawn? View lawn care data for Washington County on LawnByCounty.com →
Other Counties in Ohio
Soil data sourced from USDA SSURGO via Soil Data Access. Data is informational only and should not be used as a substitute for on-site soil testing. Contact your local NRCS office for site-specific soil information.