Flagler County, FL Shrink-Swell Risk
Shrink-swell potential in Flagler County, FL
Low
Soil across 84.2% of Flagler County, FL comes back "Low" in USDA's shrink-swell data, averaging 1.35% linear extensibility. Among the 3,144 counties on this site, that's the clean result: little shrink-swell movement, standard construction the likely outcome.
What this number does and doesn't tell you
This is a countywide, area-weighted figure across every soil survey map unit in Flagler County, FL - never a reading for one specific parcel. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).
Flagler County: the real numbers
Flagler 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, Flagler County, FL ranks 2,658 most-constrained nationally, and 14 of 66 within Florida. The county spans 486 square miles, home to 136,744 people.
Before you act on this
Orleans Parish, LA carries this site's most-constrained reading. Lander County, NV and Franklin County, KS 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 Florida
Every county in Florida is on this site, including Baker County, FL and Okaloosa County, FL. The full underlying dataset is downloadable directly, one row per county.