Jefferson Davis Parish, LA Shrink-Swell Risk

What Jefferson Davis Parish, LA's soil means for a foundation

Moderate

USDA's SSURGO data puts Jefferson Davis Parish, LA's soil at "Moderate" shrink-swell potential, an area-weighted linear extensibility of 4.31% across 62.5% of the county's surveyed land. Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

This is a county figure, not a lot figure

USDA's survey covers the whole of Jefferson Davis Parish, LA at once, not any single address. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

Report cost vs. repair cost

With Jefferson Davis Parish, LA rating "Moderate", 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.

Jefferson Davis Parish's rank among Louisiana counties

Nationally, Jefferson Davis Parish, LA is the 436-most-constrained of 3,085 rated counties for shrink-swell soil. Within Louisiana alone it ranks 38 of 64. Jefferson Davis Parish covers 652 square miles and counts 31,436 residents.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Wayne County, TN and Carroll 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

More of Louisiana

Every county in Louisiana is on this site, including Franklin Parish, LA and Tangipahoa Parish, LA. The full underlying dataset is downloadable directly, one row per county.