Sinkhole risk in Costilla County, CO: 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 1,228 square miles, under one square mile of Costilla County maps onto soluble rock. With about 3,686 residents (3 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 317 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 Costilla County

The nearest county rated sinkhole country is Briscoe County, TX, about 303 miles southeast. 1 of the 6 closest counties land in the same band; the ground changes quickly around here.

Alamosa County, CO 28 mi northwest · 0% at surface
Huerfano County, CO 38 mi northeast · 23% at surface
Conejos County, CO 41 mi west · 0% at surface
Taos County, NM 50 mi south · 19% at surface
Custer County, CO 57 mi north · under 1% at surface
Rio Grande County, CO 58 mi west · 0% at surface

Against the rest of Colorado

Costilla County ranks 48 of 64 in Colorado for soluble rock at the surface, and sits above 0% of US counties on that measure.