Washington County Soil Data
Washington County, Arkansas
Avg pH
5.5
Texture
Loam
Drainage
Subaqueous
Organic Matter
3.5%
Hydrologic Group
N/A
Data Story
About Soil in Washington County, Arkansas
Typical Ozark Acidity in Washington County
Washington County maintains an average pH of 5.46, falling just below the Arkansas state average of 5.56. This acidic profile is typical for the region, requiring soil management for those accustomed to the national median of 6.5.
Silty Mix with Moderate Clay Content
The soil contains 46.3% silt and 17.8% clay, offering a good balance between nutrient storage and physical structure. With 33.7% sand, the soil provides enough drainage to prevent the heavy silt from compacting too quickly.
Strong Water Storage and Healthy Organic Levels
At 3.46% organic matter, the soil is healthier than many neighboring counties, though it still sits below the 4.15% state average. The available water capacity of 0.155 in/in is a strength, beating the state benchmark for moisture retention.
Unique Hydrology Near Local Waterways
Dominant soils are classified as subaqueous, reflecting areas that are often saturated or near the water table. While specific hydrologic group data is limited, this suggests a landscape deeply influenced by its proximity to Ozark streams.
Ideal Growing for Zone 7a Favorites
Washington County’s zone 7a climate is famous for apples, berries, and diverse gardens. The soil’s above-average water capacity makes it an excellent choice for a productive home orchard or vegetable patch.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Hydrologic group data not available.
Drainage Class
Subaqueous
Drainage class: Subaqueous
Soil Profile
Dominant texture: Loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Frequently Asked Questions
What type of soil does Washington County have?
Washington County's soil is classified as Loam. This indicates the relative proportions of sand, silt, and clay — 34% sand, 46% silt, and 18% 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 low pH of 5.5, which is strongly acidic. Acidic soils benefit from lime applications to raise pH and improve nutrient availability.
What is the drainage class for Washington County?
Washington County has a dominant drainage class of "Subaqueous." Moderate drainage allows adequate moisture retention while still permitting excess water to drain over time.
What crops or plants grow well in Washington County's soil?
Based on Washington County's Loam texture, pH of 5.5, and Subaqueous, the soil is well suited for acid-loving plants like blueberries and azaleas, row crops and vegetable gardens.
What USDA soil order is found in Washington County?
The dominant USDA soil order for Washington County is not currently available in our dataset.
Planning your lawn? View lawn care data for Washington County on LawnByCounty.com →
Other Counties in Arkansas
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.