Columbus County, NC Shrink-Swell Risk
Shrink-swell potential in Columbus County, NC
Low
Soil across 91.5% of Columbus County, NC comes back "Low" in USDA's shrink-swell data, averaging 1.66% 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 this number does and doesn't tell you
This is a countywide, area-weighted figure across every soil survey map unit in Columbus County, NC - never a reading for one specific parcel. 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 Columbus County.
Columbus County: the real numbers
Columbus County's soil reading points toward standard foundation practice as the likely outcome, not the exception. 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
Among the 3,085 rated counties on this site, Columbus County, NC ranks 2,325 most-constrained nationally, and 53 of 100 within North Carolina. Columbus County covers 938 square miles and counts 50,054 residents.
See how another county compares
Orleans Parish, LA carries this site's most-constrained reading. Yamhill County, OR and Madison County, NY 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
Elsewhere in North Carolina
Every county in North Carolina is on this site, including Washington County, NC and Durham County, NC. The full underlying dataset is downloadable directly, one row per county.