Grant County, WA Shrink-Swell Risk

What Grant County, WA's soil means for a foundation

Low

USDA's SSURGO data puts Grant County, WA's soil at "Low" shrink-swell potential, an area-weighted linear extensibility of 1.57% across 97.9% of the county's surveyed land. Among the 3,144 counties on this site, that's the clean result: little shrink-swell movement, standard construction the likely outcome.

This is a county figure, not a lot figure

USDA's survey covers the whole of Grant County, WA at once, not any single address. 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 Grant County.

Report cost vs. repair cost

With Grant 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.

Where this sits nationally

Nationally, Grant County, WA is the 2,412-most-constrained of 3,085 rated counties for shrink-swell soil. Within Washington alone it ranks 29 of 39. Grant County, WA is 2,680 square miles with a population of 104,717.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Yalobusha County, MS and Fallon County, MT 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 Grays Harbor County, WA and Asotin County, WA. The full underlying dataset is downloadable directly, one row per county.