Sullivan County, MO Shrink-Swell Risk

What Sullivan County, MO's soil means for a foundation

Moderate

USDA's SSURGO data puts Sullivan County, MO's soil at "Moderate" shrink-swell potential, an area-weighted linear extensibility of 5.25% across 46.1% 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 Sullivan County, MO at once, not any single address. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Sullivan County will actually do.

Report cost vs. repair cost

With Sullivan County, MO 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.

How Sullivan County, MO compares

Nationally, Sullivan County, MO is the 249-most-constrained of 3,085 rated counties for shrink-swell soil. Within Missouri alone it ranks 32 of 114. Sullivan County, MO is 648 square miles with a population of 5,750.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Levy County, FL and Pulaski County, IL 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 Missouri

Every county in Missouri is on this site, including Knox County, MO and Jasper County, MO. The full underlying dataset is downloadable directly, one row per county.