Marion County, IL Shrink-Swell Risk

Marion County's SSURGO shrink-swell reading

Moderate

In Marion County, IL, 67.9% of the surveyed soil carries a "Moderate" shrink-swell rating, 3.55% linear extensibility on average. Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

Before you rely on this for one address

Marion County's reading is an average across the whole county, not a promise about any one lot inside it. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Marion County will actually do.

Budgeting for Marion County, IL

Marion County's soil reading points toward standard foundation practice as the likely outcome, not the exception. 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 Marion County, IL compares

Among the 3,085 rated counties on this site, Marion County, IL ranks 807 most-constrained nationally, and 56 of 101 within Illinois. The county spans 573 square miles, home to 36,437 people.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Yoakum County, TX and Putnam County, FL 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

Elsewhere in Illinois

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