McMullen County, TX Shrink-Swell Risk
Shrink-swell potential in McMullen County, TX
High
Soil across 31% of McMullen County, TX comes back "High" in USDA's shrink-swell data, averaging 6.94% linear extensibility. 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.
What this number does and doesn't tell you
This is a countywide, area-weighted figure across every soil survey map unit in McMullen County, TX - never a reading for one specific parcel. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).
McMullen County: the real numbers
With McMullen 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.
How McMullen County, TX compares
Among the 3,085 rated counties on this site, McMullen County, TX ranks 79 most-constrained nationally, and 28 of 253 within Texas. McMullen County covers 1,140 square miles and counts 565 residents.
See how another county compares
Orleans Parish, LA carries this site's most-constrained reading. Clarke County, AL and Madison County, IA 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 Grimes County, TX and Runnels County, TX. The full underlying dataset is downloadable directly, one row per county.