Sinkhole risk in San Augustine 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%

What to do about a house in San Augustine County

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

Across 531 square miles, under one square mile of San Augustine County maps onto soluble rock. With about 7,767 residents (15 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 246 map points about 1.5 miles apart, so a pocket smaller than that can be missed or overstated.

Counties around San Augustine County

The nearest county rated sinkhole country is Adair County, OK, about 313 miles north. 2 of the 6 closest counties land in the same band; the ground changes quickly around here.

Sabine County, TX 19 mi east · 0% at surface
Angelina County, TX 28 mi west · 0% at surface
Shelby County, TX 28 mi north · 0% at surface
Nacogdoches County, TX 32 mi northwest · 0% at surface
Sabine Parish, LA 38 mi east · 0% at surface
Tyler County, TX 44 mi south · 0% at surface

Against the rest of Texas

San Augustine County ranks 230 of 254 in Texas for soluble rock at the surface, and sits above 0% of US counties on that measure.