Walla Walla County, WA Shrink-Swell Risk
Walla Walla County's SSURGO shrink-swell reading
Low
In Walla Walla County, WA, 98.9% of the surveyed soil carries a "Low" shrink-swell rating, 1.58% linear extensibility on average. Among the 3,144 counties on this site, that's the clean result: little shrink-swell movement, standard construction the likely outcome.
Before you rely on this for one address
Walla Walla County's reading is an average across the whole county, not a promise about any one lot inside it. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Walla Walla County will actually do.
Budgeting for Walla Walla County, WA
Walla Walla 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, Walla Walla County, WA ranks 2,400 most-constrained nationally, and 27 of 39 within Washington. The county spans 1,270 square miles, home to 62,068 people.
See how another county compares
Orleans Parish, LA carries this site's most-constrained reading. Fayette County, IL and Madera County, CA 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 Washington
Every county in Washington is on this site, including Grant County, WA and Yakima County, WA. The full underlying dataset is downloadable directly, one row per county.