Madison County, NC Shrink-Swell Risk

Madison County, NC's soil, for shrink-swell risk

Low

Madison County, NC: USDA's soil survey rates 95.2% of the county "Low" for shrink-swell potential (1.34% 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 Madison County's reading doesn't cover

Two lots a mile apart in Madison County can carry different soil, even though they share one countywide reading. A site-specific soil report, usually $1,000-$5,000, is what an engineer would actually pull before designing a foundation on a lot in Madison County.

What it costs to find out, versus to ignore it

With Madison County, NC 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, Madison County, NC is the 2,671-most-constrained of 3,085 rated counties for shrink-swell soil. Within North Carolina alone it ranks 89 of 100. Madison County covers 450 square miles and counts 22,352 residents.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Washington County, NE and Passaic County, NJ 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 North Carolina

Every county in North Carolina is on this site, including Columbus County, NC and Yancey County, NC. The full underlying dataset is downloadable directly, one row per county.