Polk County, FL Shrink-Swell Risk

Polk County, FL's soil, for shrink-swell risk

Low

Polk County, FL: USDA's soil survey rates 92.2% of the county "Low" for shrink-swell potential (1.47% 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 Polk County's reading doesn't cover

Two lots a mile apart in Polk 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 Polk County, FL 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, Polk County, FL is the 2,543-most-constrained of 3,085 rated counties for shrink-swell soil. Within Florida alone it ranks 8 of 66. Polk County covers 1,798 square miles and counts 852,878 residents.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Kay County, OK and Hunterdon 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 Florida

Every county in Florida is on this site, including Flagler County, FL and Citrus County, FL. The full underlying dataset is downloadable directly, one row per county.