Washington County Soil Data
Washington County, Oklahoma
Avg pH
5.4
Texture
Water
Drainage
N/A
Organic Matter
1.9%
Hydrologic Group
N/A
Data Story
About Soil in Washington County, Oklahoma
Strongly Acidic Ground in Northeast Oklahoma
Washington County averages a pH of 5.38, placing it well below the state average of 6.06 and the national median of 6.5. This significant acidity can limit the availability of certain nutrients unless the soil is specifically managed.
A Silty Mix with Moderate Structure
The soil composition is 39.9% silt and 27.1% sand, which creates a silty texture that resists crusting. A clay fraction of 19.9% provides enough structure to hold fertilizers effectively without the heaviness of pure clay.
Rich Organic Matter and High Water Storage
At 1.91%, the organic matter content is higher than the Oklahoma average of 1.72%. This is paired with an available water capacity of 0.155 in/in, which is among the better water-retention scores in the state.
Monitoring Runoff in Silty Conditions
While specific drainage classes are not recorded for the dominant soil types here, the high silt content influences surface runoff patterns. Homeowners should observe how heavy rains move across their property before starting major landscaping projects.
Vibrant Gardens in Hardiness Zone 7a
The combination of high organic matter and good water storage makes Zone 7a ideal for tomatoes and leafy greens. Your soil has the biological foundation to support a very lush and healthy landscape.
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
Drainage class data not available.
Soil Profile
Dominant texture: Water
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 Water. This indicates the relative proportions of sand, silt, and clay — 27% sand, 40% silt, and 20% clay. Sandy soils drain quickly but may need more frequent irrigation and fertilization.
Is Washington County's soil acidic or alkaline?
Washington County's soil has a low pH of 5.4, 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?
Drainage class data is not currently available for Washington County.
What crops or plants grow well in Washington County's soil?
Based on Washington County's Water texture, pH of 5.4, and drainage class, the soil is well suited for acid-loving plants like blueberries and azaleas.
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 Oklahoma
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.