Union County, AR Shrink-Swell Risk

Union County, AR's soil, for shrink-swell risk

Low

Union County, AR: USDA's soil survey rates 80.4% of the county "Low" for shrink-swell potential (2.52% linear extensibility). Among the 3,144 counties on this site, that's the clean result: little shrink-swell movement, standard construction the likely outcome.

What Union County's reading doesn't cover

Two lots a mile apart in Union County can carry different soil, even though they share one countywide reading. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Union County will actually do.

What it costs to find out, versus to ignore it

With Union County, AR rating "Low", a geotechnical report is still worthwhile before a build, just less urgent than in a high-risk county. 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

Nationally, Union County, AR is the 1,547-most-constrained of 3,085 rated counties for shrink-swell soil. Within Arkansas alone it ranks 45 of 75. Union County, AR is 1,039 square miles with a population of 37,008.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Sullivan County, NY and Hawaii County, HI 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

More of Arkansas

Every county in Arkansas is on this site, including Faulkner County, AR and Johnson County, AR. The full underlying dataset is downloadable directly, one row per county.