Dillon County, SC Shrink-Swell Risk

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

Low

USDA's SSURGO data puts Dillon County, SC's soil at "Low" shrink-swell potential, an area-weighted linear extensibility of 2.25% across 69.6% of the county's surveyed land. That's the easiest starting point on this site's scale - a standard foundation is the reasonable default here, though any one lot can still differ.

This is a county figure, not a lot figure

USDA's survey covers the whole of Dillon 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 Dillon 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.

Where this sits nationally

Nationally, Dillon County, SC is the 1,758-most-constrained of 3,085 rated counties for shrink-swell soil. Within South Carolina alone it ranks 12 of 46. Dillon County covers 405 square miles and counts 27,577 residents.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Mercer County, PA and McIntosh County, OK 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 Kershaw County, SC and Oconee County, SC. The full underlying dataset is downloadable directly, one row per county.