Darlington County, SC Shrink-Swell Risk

Darlington County, SC's soil, for shrink-swell risk

Low

Darlington County, SC: USDA's soil survey rates 86% of the county "Low" for shrink-swell potential (1.77% linear extensibility). 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.

What Darlington County's reading doesn't cover

Two lots a mile apart in Darlington County can carry different soil, even though they share one countywide reading. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

What it costs to find out, versus to ignore it

With Darlington 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, Darlington County, SC is the 2,193-most-constrained of 3,085 rated counties for shrink-swell soil. Within South Carolina alone it ranks 22 of 46. Darlington County, SC is 561 square miles with a population of 62,425.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Tazewell County, IL and Macon County, NC 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 Georgetown County, SC and Aiken County, SC. The full underlying dataset is downloadable directly, one row per county.