Williamson County, TX Shrink-Swell Risk

Williamson County's SSURGO shrink-swell reading

High

In Williamson County, TX, 39.9% of the surveyed soil carries a "High" shrink-swell rating, 7.34% linear extensibility on average. Soil at this level can crack a standard foundation without moisture-control measures - consistent watering near the foundation, correct grading, root barriers - or added structural design.

Before you rely on this for one address

Williamson County's reading is an average across the whole county, not a promise about any one lot inside it. A site-specific soil report, usually $1,000-$5,000, is what an engineer would actually pull before designing a foundation on a lot in Williamson County.

Budgeting for Williamson County, TX

With Williamson County, TX rating "High", the gap between finding out early and finding out late is the whole decision. A geotechnical report runs $1,000-$5,000 (typically $2,700); an actual foundation repair, once cracking sets in, typically runs $5,000-$15,000 (around $10,000 typical) - roughly 4x the report.

Where this sits nationally

Among the 3,085 rated counties on this site, Williamson County, TX ranks 68 most-constrained nationally, and 23 of 253 within Texas. Williamson County, TX is 1,116 square miles with a population of 727,480.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Dundy County, NE and Canadian County, OK are worth a look for comparison.

How this reading is built, and its real limits · The warning signs of expansive-clay damage, explained

Elsewhere in Texas

Every county in Texas is on this site, including Moore County, TX and Jackson County, TX. The full underlying dataset is downloadable directly, one row per county.