Mason County, IL Shrink-Swell Risk

Shrink-swell potential in Mason County, IL

Low

Soil across 67.9% of Mason County, IL comes back "Low" in USDA's shrink-swell data, averaging 2.01% linear extensibility. That's as favorable a county-level reading as this dataset produces - standard foundation practice, pending one lot's own geotechnical report.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Mason County, IL - never a reading for one specific parcel. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

Mason County: the real numbers

Mason 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.

Where this sits nationally

Among the 3,085 rated counties on this site, Mason County, IL ranks 1,976 most-constrained nationally, and 101 of 101 within Illinois. The county spans 539 square miles, home to 12,543 people.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Franklin County, TX and Monroe County, KY 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 Fayette County, IL and McDonough County, IL. The full underlying dataset is downloadable directly, one row per county.