WilCo Soil-Type Risk Checker
In Williamson County, the ground under your house — not the city name — sets how much your foundation moves. Enter your ZIP for a quick read.
General soil guidance based on Williamson County geology — not a site-specific survey. Lots vary, and cut-and-fill grading can change the picture on any street. An elevation survey and an engineer’s look confirm your specific home.
Why soil decides everything here
East of I-35 — Hutto, Taylor, Pflugerville — the county sits on deep Blackland Prairie clay, which swells when wet and shrinks hard in a drought. That seasonal movement is what walks a slab and cracks it. West toward Cedar Park and Leander, the ground turns to Edwards limestone, which barely moves. Same county, very different foundation risk. There’s a deeper explainer on why east-county homes crack more, and if you’re already seeing issues, the 7 warning signs help you read them.
Get a local crew’s read
Whatever your soil, an on-site look tells you what’s really happening. We’ll match you with up to three independent local contractors — free, no obligation.