Coahoma County, MS Shrink-Swell Risk

What Coahoma County, MS's soil means for a foundation

High

USDA's SSURGO data puts Coahoma County, MS's soil at "High" shrink-swell potential, an area-weighted linear extensibility of 8.32% across 36.2% of the county's surveyed land. Ground like this needs active moisture control to keep a conventional foundation from cracking - it's not automatic either way.

This is a county figure, not a lot figure

USDA's survey covers the whole of Coahoma County, MS at once, not any single address. 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 Coahoma County.

Report cost vs. repair cost

Given Coahoma County's rating, spending a few thousand now is the way to avoid spending tens of thousands later. The report ($1,000-$5,000) is what tells you whether Coahoma 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.

How Coahoma County, MS compares

Nationally, Coahoma County, MS is the 52-most-constrained of 3,085 rated counties for shrink-swell soil. Within Mississippi alone it ranks 10 of 82. The county spans 553 square miles, home to 20,105 people.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Perry County, OH and Coos County, NH 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 Hancock County, MS and Panola County, MS. The full underlying dataset is downloadable directly, one row per county.