Sinkhole risk in Jefferson County, ID: Not karst, but voids possible

Not karst, but voids possible

No soluble bedrock; some pseudokarst (piping or lava-tube ground).

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

The next step for one property

Not true karst, but soil piping or lava tubes can still open voids - mention it to an inspector.

Across 1,094 square miles, under one square mile of Jefferson County maps onto soluble rock. With about 34,854 residents (32 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 282 map points about 2.0 miles apart, so a pocket smaller than that can be missed or overstated.

Worth reading for this county: how ground with no limestone still opens up, and how these percentages are measured.

Counties around Jefferson County

The nearest county rated sinkhole country is Emery County, UT, about 341 miles south. None of the 6 closest counties land in the same band, so Jefferson County stands out from its surroundings.

Madison County, ID 33 mi east · 5% at surface
Clark County, ID 34 mi north · 14% at surface
Bingham County, ID 40 mi south · 8% at surface
Butte County, ID 44 mi west · 24% at surface
Bonneville County, ID 45 mi southeast · 17% at surface
Fremont County, ID 51 mi northeast · 9% at surface

Against the rest of Idaho

Jefferson County ranks 36 of 44 in Idaho for soluble rock at the surface, and sits above 0% of US counties on that measure.