Richland County, IL Shrink-Swell Risk

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

Moderate

Richland County, IL: USDA's soil survey rates 69.4% of the county "Moderate" for shrink-swell potential (3.48% linear extensibility). Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

What Richland County's reading doesn't cover

Two lots a mile apart in Richland 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 Richland County will actually do.

What it costs to find out, versus to ignore it

With Richland 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.

How Richland County, IL compares

Nationally, Richland County, IL is the 857-most-constrained of 3,085 rated counties for shrink-swell soil. Within Illinois alone it ranks 67 of 101. Richland County covers 360 square miles and counts 15,362 residents.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Hoke County, NC and Graham County, KS 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 Jo Daviess County, IL and Effingham County, IL. The full underlying dataset is downloadable directly, one row per county.