Williamson County Soil Data
Williamson County, Texas
Avg pH
7.4
Texture
Silty clay loam
Drainage
Well drained
Organic Matter
2.1%
Hydrologic Group
B
Data Story
About Soil in Williamson County, Texas
Fertile Inceptisols on the Edge of the Hill Country
Williamson County is defined by Inceptisols, which are relatively young but highly productive soils. The average pH is 7.35, which is more alkaline than the national median but provides excellent minerals for plant growth. These soils contribute to a high county soil score of 38.2, well above the Texas average.
Rich Silty Clay Loams
The soil consists of 36.2% clay and 35.6% silt, creating a silty clay loam texture. This composition provides exceptional nutrient retention and structural support for plants. However, the high clay content can make the soil difficult to till when it is too dry or too wet.
Top-Tier Organic Matter and Water Storage
Organic matter is a standout at 2.12%, surpassing both the Texas average of 1.66% and the national average of 2.0%. The available water capacity is also high at 0.146 in/in. These factors combined create some of the best natural growing conditions in the state.
Well-Drained Land with Moderate Infiltration
The soil is classified as well-drained and falls into Hydrologic Group B. This group suggests a moderate infiltration rate, meaning the soil absorbs water well without excessive runoff. It is an ideal profile for both large-scale farming and home gardening projects.
Abundant Possibilities in Zone 9a
With a long growing season in Zone 9a, you can grow everything from tomatoes to heritage roses. Your soil's high organic matter and water capacity give you a major advantage over neighboring counties. Focus on plants that thrive in slightly alkaline clay to make the most of this fertile land.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Group B — Moderate Runoff
Moderately deep, moderately well-drained soils with moderate infiltration rates. Good balance of drainage and water retention.
Drainage Class
Well drained
Water is removed from the soil readily but not rapidly. Optimal for most plants and construction.
Soil Profile
Dominant texture: Silty clay loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Frequently Asked Questions
What type of soil does Williamson County have?
Williamson County's soil is classified as Silty clay loam. This indicates the relative proportions of sand, silt, and clay — 26% sand, 36% silt, and 36% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Williamson County's soil acidic or alkaline?
Williamson County's soil has a pH of 7.4, which is near neutral. This range is ideal for most garden plants and field crops.
What is the drainage class for Williamson County?
Williamson 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 Williamson County's soil?
Based on Williamson County's Silty clay loam texture, pH of 7.4, and Well drained, the soil is well suited for drought-tolerant crops and native grasses, row crops and vegetable gardens, most annual and perennial crops.
What USDA soil order is found in Williamson County?
Williamson County's dominant soil order is Inceptisols. Inceptisols are young soils with weak horizon development. They occur in a wide range of climates and parent materials.
Planning your lawn? View lawn care data for Williamson 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.