Sinkhole risk in Sonoma County, CA: 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 Sonoma County
No soluble bedrock is mapped here, so natural sinkholes are unlikely. Collapses from broken pipes or old mines are a separate risk.
Across 1,575 square miles, under one square mile of Sonoma County maps onto soluble rock. With about 485,375 residents (308 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 494 map points about 1.8 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 Sonoma County
The nearest county rated sinkhole country is Emery County, UT, about 658 miles east. 4 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.
- Napa County, CA 32 mi east · 2% at surface
- Marin County, CA 34 mi south · 0% at surface
- Lake County, CA 41 mi north · 2% at surface
- San Francisco County, CA 55 mi south · 0% at surface
- Yolo County, CA 56 mi east · 0% at surface
- Solano County, CA 56 mi east · 0% at surface
Against the rest of California
Sonoma County ranks 54 of 58 in California for soluble rock at the surface, and sits above 0% of US counties on that measure.
- Trinity County 25%
- Inyo County 17%
- Ventura County 9%
- Shasta County 9%
- Siskiyou County 9%