Plumas County, CA Shrink-Swell Risk

Plumas County, CA's soil, for shrink-swell risk

Moderate

Plumas County, CA: USDA's soil survey rates 62.4% of the county "Moderate" for shrink-swell potential (3.08% linear extensibility). Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

What Plumas County's reading doesn't cover

Two lots a mile apart in Plumas 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 Plumas County, CA rating "Moderate", 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.

How Plumas County, CA compares

Nationally, Plumas County, CA is the 1,130-most-constrained of 3,085 rated counties for shrink-swell soil. Within California alone it ranks 22 of 58. Plumas County, CA is 2,553 square miles with a population of 18,834.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Chambers County, TX and Halifax County, NC 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 California

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