Castro County, TX Shrink-Swell Risk

What Castro County, TX's soil means for a foundation

Moderate

USDA's SSURGO data puts Castro County, TX's soil at "Moderate" shrink-swell potential, an area-weighted linear extensibility of 5.52% across 91.6% of the county's surveyed land. That's a middle reading: not the sharp swings that crack a foundation outright, but enough that grading and drainage are worth getting right.

This is a county figure, not a lot figure

USDA's survey covers the whole of Castro County, TX at once, not any single address. 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 Castro County.

Report cost vs. repair cost

With Castro County, TX rating "Moderate", a geotechnical report is still worthwhile before a build, just less urgent than in a high-risk county. A geotechnical report runs $1,000-$5,000, typically around $2,700. Foundation repair, if a specific lot turns out to differ from the county average, runs $5,000-$15,000.

Where this sits nationally

Nationally, Castro County, TX is the 212-most-constrained of 3,085 rated counties for shrink-swell soil. Within Texas alone it ranks 57 of 253. Castro County, TX is 894 square miles with a population of 7,380.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Keweenaw County, MI and Franklin County, NE are worth a look for comparison.

How this reading is built, and its real limits · Moisture management: the cheap fix that works on any soil

More of Texas

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