Sinkhole risk in San Joaquin 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 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 1,392 square miles, under one square mile of San Joaquin County maps onto soluble rock. With about 816,108 residents (586 per square mile), most of the county is built up, so a mapped unit is likely to sit under somebody's street. The figures come from 281 map points about 2.2 miles apart, so a pocket smaller than that can be missed or overstated.
Two things to read before deciding: how these percentages are measured, and the warning signs that apply anywhere.
Counties around San Joaquin County
The nearest county rated sinkhole country is Emery County, UT, about 575 miles east. 6 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.
- Stanislaus County, CA 30 mi southeast · 0% at surface
- Sacramento County, CA 36 mi north · 0% at surface
- Contra Costa County, CA 37 mi west · 0% at surface
- Alameda County, CA 40 mi southwest · 0% at surface
- Calaveras County, CA 43 mi northeast · under 1% at surface
- Solano County, CA 43 mi northwest · 0% at surface
Against the rest of California
San Joaquin County ranks 51 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%