Washington County Soil Data
Washington County, Texas
USDA SSURGO / PHZMAvg pH
6.8
Texture
Clay Loam
Drainage
N/A
Organic Matter
1.6%
Hydrologic Group
D
Data Story
About Soil in Washington County, Texas
Near Neutral Soil Identity
Washington County features an average pH of 6.84, which is very close to the ideal neutral mark. This is slightly higher than the national median of 6.5 but lower than the Texas average of 7.09. The county earns a strong soil score of 38.8, outperforming the state average.
Balanced Composition for Better Structure
The soil is comprised of 43.8% sand, 25.7% silt, and 27.2% clay. This relatively high clay content for the region helps the soil retain nutrients better than sandier neighbors. The balanced mix provides a solid foundation for both agricultural and residential use.
Excellent Water Retention Potential
With an available water capacity of 0.139 in/in, this county exceeds the Texas average of 0.133. Organic matter stands at 1.58%, which is nearly on par with the state average of 1.66%. These factors combine to create a reliable environment for growing a variety of crops.
Hydrologic Group D Runoff Risks
Like many coastal plain counties, Washington County falls into Hydrologic Group D. This indicates slow water infiltration and a higher risk of runoff during heavy storms. Proper drainage planning is necessary to keep garden beds and building foundations from becoming waterlogged.
Success in Hardiness Zone 9a
Washington County’s location in Zone 9a is perfect for everything from spring wildflowers to fall harvests. The near-neutral pH and good water capacity make this a versatile region for hobbyist gardeners. Grab your tools and take advantage of the productive soil in the birthplace of Texas.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Group D — High Runoff
Clay soils with very slow infiltration rates. Highest runoff potential. These soils have a permanent high water table or are shallow over impervious material.
Drainage Class
Drainage class data not available.
Soil Profile
Dominant texture: Clay Loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Clay Soil Detected
Clay soils can struggle with drainage. These products improve soil structure and water flow.
Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Washington County have?
Washington County's soil is classified as Clay Loam. This indicates the relative proportions of sand, silt, and clay — 44% sand, 26% silt, and 27% 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 6.8, which is near neutral. This range is ideal for most garden plants and field crops.
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 Clay Loam texture, pH of 6.8, and drainage class, the soil is well suited for vegetables, grains, and most field crops, 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.
Soil & Planting Advisory: Washington County
Soil Verdict
Washington County is in USDA hardiness zone 9a, a warm climate zone. where winter lows can reach 20°F. Warm winters keep soil biology active nearly year-round, accelerating decomposition but increasing pest and disease pressure in topsoil.
Planting Guidance
Tropical and subtropical plants are viable. Year-round gardening is possible, though summer heat may limit some cool-season crops. Frost is rare; tender plants can overwinter with minimal protection. 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
Rapid organic matter turnover means soils can become nutrient-poor quickly; test annually and fertilize based on results. High soil temperatures favor certain soilborne pathogens; practice crop rotation and avoid overwatering.
Regional Context
Washington County is somewhat warmer than the Texas statewide average.
Planning your lawn? View lawn care data for Washington County on LawnByCounty.com →
Other Counties in Texas
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.