Sac County, IA Shrink-Swell Risk

Shrink-swell potential in Sac County, IA

Moderate

Soil across 66.3% of Sac County, IA comes back "Moderate" in USDA's shrink-swell data, averaging 3.79% 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 Sac County, IA - never a reading for one specific parcel. 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 Sac County.

Sac County: the real numbers

Sac 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 Sac County, IA compares

Among the 3,085 rated counties on this site, Sac County, IA ranks 683 most-constrained nationally, and 53 of 99 within Iowa. Sac County, IA is 575 square miles with a population of 9,533.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Steuben County, NY and Denver County, CO 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 Iowa

Every county in Iowa is on this site, including Ida County, IA and Montgomery County, IA. The full underlying dataset is downloadable directly, one row per county.