Sinkhole risk in Henderson County, TX: 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 874 square miles, under one square mile of Henderson County maps onto soluble rock. With about 87,467 residents (100 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 270 map points about 1.8 miles apart, so a pocket smaller than that can be missed or overstated.

Worth reading for this county: why gypsum and salt move faster than limestone, and how ground with no limestone still opens up.

Counties around Henderson County

The nearest county rated sinkhole country is Baylor County, TX, about 218 miles northwest. 2 of the 6 closest counties land in the same band; the ground changes quickly around here.

Van Zandt County, TX 24 mi north · 0% at surface
Anderson County, TX 28 mi southeast · 0% at surface
Smith County, TX 36 mi east · 0% at surface
Kaufman County, TX 37 mi northwest · 0% at surface
Navarro County, TX 38 mi west · 0% at surface
Freestone County, TX 39 mi southwest · under 1% at surface

Against the rest of Texas

Henderson County ranks 189 of 254 in Texas for soluble rock at the surface, and sits above 0% of US counties on that measure.