Perry County, IL Shrink-Swell Risk

Shrink-swell potential in Perry County, IL

Moderate

Soil across 73.8% of Perry County, IL comes back "Moderate" in USDA's shrink-swell data, averaging 3.48% linear extensibility. Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Perry County, IL - never a reading for one specific parcel. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Perry County will actually do.

Perry County: the real numbers

Perry 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 Perry County, IL compares

Among the 3,085 rated counties on this site, Perry County, IL ranks 856 most-constrained nationally, and 66 of 101 within Illinois. Perry County covers 442 square miles and counts 20,272 residents.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Fayette County, WV and Licking County, OH 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 Macon County, IL and Tazewell County, IL. The full underlying dataset is downloadable directly, one row per county.