Macoupin County, IL Shrink-Swell Risk

Macoupin County's SSURGO shrink-swell reading

Moderate

In Macoupin County, IL, 77% of the surveyed soil carries a "Moderate" shrink-swell rating, 4.31% linear extensibility on average. A real but modest amount of movement - standard foundations usually hold up, but drainage and moisture control around the foundation still matter more than on low-risk soil.

Before you rely on this for one address

Macoupin County's reading is an average across the whole county, not a promise about any one lot inside it. A site-specific soil report, usually $1,000-$5,000, is what an engineer would actually pull before designing a foundation on a lot in Macoupin County.

Budgeting for Macoupin County, IL

Macoupin 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.

Macoupin County's rank among Illinois counties

Among the 3,085 rated counties on this site, Macoupin County, IL ranks 435 most-constrained nationally, and 12 of 101 within Illinois. The county spans 863 square miles, home to 43,895 people.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Watauga County, NC and Cass County, IN 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 Randolph County, IL and Crawford County, IL. The full underlying dataset is downloadable directly, one row per county.