Marion County, SC Shrink-Swell Risk

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

Low

USDA's SSURGO data puts Marion County, SC's soil at "Low" shrink-swell potential, an area-weighted linear extensibility of 2.58% across 62.1% of the county's surveyed land. That's as favorable a county-level reading as this dataset produces - standard foundation practice, pending one lot's own geotechnical report.

This is a county figure, not a lot figure

USDA's survey covers the whole of Marion County, SC at once, not any single address. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Marion County will actually do.

Report cost vs. repair cost

With Marion 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 Marion County, SC compares

Nationally, Marion County, SC is the 1,490-most-constrained of 3,085 rated counties for shrink-swell soil. Within South Carolina alone it ranks 7 of 46. Marion County, SC is 489 square miles with a population of 28,368.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Otoe County, NE and Dinwiddie County, VA 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 Dillon County, SC and Edgefield County, SC. The full underlying dataset is downloadable directly, one row per county.