Colleton County, SC Shrink-Swell Risk

What Colleton County, SC's soil means for a foundation

Low

USDA's SSURGO data puts Colleton County, SC's soil at "Low" shrink-swell potential, an area-weighted linear extensibility of 2.2% across 72.4% of the county's surveyed land. Among the 3,144 counties on this site, that's the clean result: little shrink-swell movement, standard construction the likely outcome.

This is a county figure, not a lot figure

USDA's survey covers the whole of Colleton County, SC 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 Colleton County, SC 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.

How Colleton County, SC compares

Nationally, Colleton County, SC is the 1,802-most-constrained of 3,085 rated counties for shrink-swell soil. Within South Carolina alone it ranks 13 of 46. Colleton County covers 1,057 square miles and counts 39,259 residents.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Randolph County, GA and Williams County, ND 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 South Carolina

Every county in South Carolina is on this site, including Abbeville County, SC and Marlboro County, SC. The full underlying dataset is downloadable directly, one row per county.