Warren County, IL Shrink-Swell Risk

Warren County, IL's soil, for shrink-swell risk

Moderate

Warren County, IL: USDA's soil survey rates 87.9% of the county "Moderate" for shrink-swell potential (3.95% linear extensibility). Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

What Warren County's reading doesn't cover

Two lots a mile apart in Warren County can carry different soil, even though they share one countywide reading. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Warren County will actually do.

What it costs to find out, versus to ignore it

With Warren 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, Warren County, IL is the 598-most-constrained of 3,085 rated counties for shrink-swell soil. Within Illinois alone it ranks 34 of 101. The county spans 542 square miles, home to 16,217 people.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Marshall County, KY and Newberry County, SC 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 Saline County, IL and Monroe County, IL. The full underlying dataset is downloadable directly, one row per county.