Sinkhole risk in Polk County, TX: 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 1,057 square miles, under one square mile of Polk County maps onto soluble rock. With about 54,258 residents (51 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 244 map points about 2.1 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 these percentages are measured.

Counties around Polk County

The nearest county rated sinkhole country is Runnels County, TX, about 312 miles west. 6 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

San Jacinto County, TX 24 mi southwest · 0% at surface
Tyler County, TX 27 mi east · 0% at surface
Trinity County, TX 28 mi northwest · 0% at surface
Angelina County, TX 35 mi north · 0% at surface
Hardin County, TX 41 mi southeast · 0% at surface
Liberty County, TX 43 mi south · 0% at surface

Against the rest of Texas

Polk County ranks 222 of 254 in Texas for soluble rock at the surface, and sits above 0% of US counties on that measure.