Washington County, MS Shrink-Swell Risk

Washington County, MS's soil, for shrink-swell risk

Very High

Washington County, MS: USDA's soil survey rates 55.5% of the county "Very High" for shrink-swell potential (9.64% linear extensibility). That's the range most associated with real foundation cracking - stair-step cracks in mortar joints, sticking doors, gaps around window frames - and it typically needs an engineered foundation (post-tension slab, drilled piers), not a standard footing.

What Washington County's reading doesn't cover

Two lots a mile apart in Washington 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 Washington County will actually do.

What it costs to find out, versus to ignore it

With Washington County, MS rating "Very High", the gap between finding out early and finding out late is the whole decision. The report ($1,000-$5,000) is what tells you whether Washington County's county-level reading applies to your lot; the repair ($5,000-$15,000) is what it costs if you skip that and find out from the cracks instead.

Washington County's rank among Mississippi counties

Nationally, Washington County, MS is the 35-most-constrained of 3,085 rated counties for shrink-swell soil. Within Mississippi alone it ranks 9 of 82. Washington County, MS is 724 square miles with a population of 41,181.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Dixon County, NE and Colquitt County, GA are worth a look for comparison.

How this reading is built, and its real limits · The warning signs of expansive-clay damage, explained

More of Mississippi

Every county in Mississippi is on this site, including Quitman County, MS and Clarke County, MS. The full underlying dataset is downloadable directly, one row per county.