Clallam County, WA Shrink-Swell Risk

Clallam County, WA's soil, for shrink-swell risk

Low

Clallam County, WA: USDA's soil survey rates 78.7% of the county "Low" for shrink-swell potential (2.04% 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 Clallam County's reading doesn't cover

Two lots a mile apart in Clallam County can carry different soil, even though they share one countywide reading. 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 Clallam County.

What it costs to find out, versus to ignore it

With Clallam County, WA 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.

Clallam County's rank among Washington counties

Nationally, Clallam County, WA is the 1,946-most-constrained of 3,085 rated counties for shrink-swell soil. Within Washington alone it ranks 14 of 39. Clallam County covers 1,739 square miles and counts 77,958 residents.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Livingston County, MO and Schenectady County, NY 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 Washington

Every county in Washington is on this site, including Jefferson County, WA and San Juan County, WA. The full underlying dataset is downloadable directly, one row per county.