Sinkhole risk in Mason 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 to do about a house in Mason County
No soluble bedrock is mapped here, so natural sinkholes are unlikely. Collapses from broken pipes or old mines are a separate risk.
Across 960 square miles, under one square mile of Mason County maps onto soluble rock. With about 69,632 residents (73 per square mile), homes are spread across towns and farmland, and a mapped unit may or may not reach the developed parts. The figures come from 344 map points about 1.7 miles apart, so a pocket smaller than that can be missed or overstated.
Read next: how these percentages are measured, and the warning signs that apply anywhere.
Counties around Mason County
The nearest county rated sinkhole country is Emery County, UT, about 850 miles southeast. 5 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.
- Kitsap County, WA 32 mi northeast · 0% at surface
- Thurston County, WA 33 mi southeast · 0% at surface
- Grays Harbor County, WA 35 mi southwest · 0% at surface
- Jefferson County, WA 35 mi northwest · 0% at surface
- Pierce County, WA 52 mi southeast · 0% at surface
- Island County, WA 60 mi northeast · 0% at surface
Against the rest of Washington
Mason County ranks 29 of 39 in Washington for soluble rock at the surface, and sits above 0% of US counties on that measure.
- San Juan County 4%
- Stevens County 3%
- Pend Oreille County 2%
- Okanogan County under 1%
- Ferry County under 1%