Johnson County, TX Shrink-Swell Risk

Shrink-swell potential in Johnson County, TX

High

Soil across 37% of Johnson County, TX comes back "High" in USDA's shrink-swell data, averaging 6.47% linear extensibility. This is enough movement to matter: a standard footing can hold up here, but usually only with real moisture management, not by default.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Johnson 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).

Johnson County: the real numbers

Johnson County's soil reading is exactly the case where a report before construction, or before cracks widen, pays for itself. 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.

Johnson County's rank among Texas counties

Among the 3,085 rated counties on this site, Johnson County, TX ranks 92 most-constrained nationally, and 34 of 253 within Texas. Johnson County, TX is 725 square miles with a population of 210,547.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Wadena County, MN and Daggett County, UT 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 Martin County, TX and Hays County, TX. The full underlying dataset is downloadable directly, one row per county.