Sinkhole risk in Union County, NC: 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 633 square miles, under one square mile of Union County maps onto soluble rock. With about 263,386 residents (416 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 299 map points about 1.5 miles apart, so a pocket smaller than that can be missed or overstated.

Worth reading for this county: how these percentages are measured, and the warning signs that apply anywhere.

Counties around Union County

The nearest county rated sinkhole country is Chesterfield County, SC, about 32 miles southeast, close enough that the same rock may run under the county line. 3 of the 6 closest counties land in the same band; the ground changes quickly around here.

Lancaster County, SC 23 mi southwest · 8% at surface
Anson County, NC 24 mi east · 2% at surface
Mecklenburg County, NC 25 mi northwest · 0% at surface
Stanly County, NC 27 mi northeast · 0% at surface
Cabarrus County, NC 27 mi north · 0% at surface
Chesterfield County, SC 32 mi southeast · 63% at surface

Against the rest of North Carolina

Union County ranks 96 of 100 in North Carolina for soluble rock at the surface, and sits above 0% of US counties on that measure.