Sinkhole risk in Walla Walla County, WA: No soluble rock mapped

No soluble rock mapped

No soluble bedrock mapped.

On soluble rock: 0%
At or near the surface: 0%
Buried under cover: 0%

What this means before you buy

No soluble bedrock is mapped here, so natural sinkholes are unlikely. Collapses from broken pipes or old mines are a separate risk.

Across 1,270 square miles, under one square mile of Walla Walla County maps onto soluble rock. With about 62,068 residents (49 per square mile), much of the land is open, and the mapped rock may sit far from where people actually live. The figures come from 245 map points about 2.3 miles apart, so a pocket smaller than that can be missed or overstated.

Worth reading for this county: how these percentages are measured, and the warning signs that apply anywhere.

Counties around Walla Walla County

The nearest county rated sinkhole country is Emery County, UT, about 637 miles southeast. 6 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Columbia County, WA 27 mi east · 0% at surface
Franklin County, WA 28 mi northwest · 0% at surface
Garfield County, WA 47 mi east · 0% at surface
Umatilla County, OR 47 mi south · under 1% at surface
Benton County, WA 50 mi west · 0% at surface
Adams County, WA 52 mi north · 0% at surface

Against the rest of Washington

Walla Walla County ranks 37 of 39 in Washington for soluble rock at the surface, and sits above 0% of US counties on that measure.