Humboldt County, CA Shrink-Swell Risk

Humboldt County's SSURGO shrink-swell reading

Low

In Humboldt County, CA, 77.9% of the surveyed soil carries a "Low" shrink-swell rating, 2.22% linear extensibility on average. That's as favorable a county-level reading as this dataset produces - standard foundation practice, pending one lot's own geotechnical report.

Before you rely on this for one address

Humboldt County's reading is an average across the whole county, not a promise about any one lot inside it. 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 Humboldt County.

Budgeting for Humboldt County, CA

Humboldt 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, Humboldt County, CA ranks 1,780 most-constrained nationally, and 45 of 58 within California. Humboldt County covers 3,568 square miles and counts 132,380 residents.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Quitman County, GA and Uvalde County, TX 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 California

Every county in California is on this site, including Placer County, CA and Modoc County, CA. The full underlying dataset is downloadable directly, one row per county.