Cobb County, GA Shrink-Swell Risk

Cobb County, GA's soil, for shrink-swell risk

Low

Cobb County, GA: USDA's soil survey rates 97.9% of the county "Low" for shrink-swell potential (1.5% linear extensibility). That's as favorable a county-level reading as this dataset produces - standard foundation practice, pending one lot's own geotechnical report.

What Cobb County's reading doesn't cover

Two lots a mile apart in Cobb 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 Cobb County, GA 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.

Cobb County's rank among Georgia counties

Nationally, Cobb County, GA is the 2,486-most-constrained of 3,085 rated counties for shrink-swell soil. Within Georgia alone it ranks 81 of 159. Cobb County covers 340 square miles and counts 787,538 residents.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Custer County, MT and Oxford County, ME 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 Georgia

Every county in Georgia is on this site, including Richmond County, GA and Jeff Davis County, GA. The full underlying dataset is downloadable directly, one row per county.