Kankakee County, IL Shrink-Swell Risk

What Kankakee County, IL's soil means for a foundation

Moderate

USDA's SSURGO data puts Kankakee County, IL's soil at "Moderate" shrink-swell potential, an area-weighted linear extensibility of 3.05% across 47.1% of the county's surveyed land. Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

This is a county figure, not a lot figure

USDA's survey covers the whole of Kankakee County, IL at once, not any single address. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

Report cost vs. repair cost

With Kankakee County, IL 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, Kankakee County, IL is the 1,157-most-constrained of 3,085 rated counties for shrink-swell soil. Within Illinois alone it ranks 87 of 101. The county spans 676 square miles, home to 106,410 people.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Lavaca County, TX and Pickens County, AL 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 Illinois

Every county in Illinois is on this site, including Grundy County, IL and Knox County, IL. The full underlying dataset is downloadable directly, one row per county.