Putnam County, FL Shrink-Swell Risk

Shrink-swell potential in Putnam County, FL

Low

Soil across 97.2% of Putnam County, FL comes back "Low" in USDA's shrink-swell data, averaging 0.83% 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 Putnam County, FL - 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 Putnam County.

Putnam County: the real numbers

Putnam 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, Putnam County, FL ranks 2,970 most-constrained nationally, and 47 of 66 within Florida. Putnam County covers 728 square miles and counts 77,301 residents.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Indian River County, FL and Tazewell County, VA 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 Holmes County, FL and Citrus County, FL. The full underlying dataset is downloadable directly, one row per county.