Asotin County, WA Shrink-Swell Risk

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

Moderate

USDA's SSURGO data puts Asotin County, WA's soil at "Moderate" shrink-swell potential, an area-weighted linear extensibility of 3.47% across 46.1% of the county's surveyed land. That's a middle reading: not the sharp swings that crack a foundation outright, but enough that grading and drainage are worth getting right.

This is a county figure, not a lot figure

USDA's survey covers the whole of Asotin County, WA at once, not any single address. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

Report cost vs. repair cost

With Asotin County, WA 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.

Asotin County's rank among Washington counties

Nationally, Asotin County, WA is the 863-most-constrained of 3,085 rated counties for shrink-swell soil. Within Washington alone it ranks 1 of 39. Asotin County covers 636 square miles and counts 22,523 residents.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Iowa County, IA and Clinton County, MI 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 Okanogan County, WA and Columbia County, WA. The full underlying dataset is downloadable directly, one row per county.