Sinkhole risk in Anson County, NC: Mostly deep or small

Mostly deep or small

Some soluble rock, mostly deeply buried or in a small share of the county.

On soluble rock: 2%
At or near the surface: 2%
Buried under cover: 0%

What to do about a house in Anson County

Sinkholes are uncommon here; watch for new depressions after heavy rain or leaking pipes.

That works out to roughly 12 of Anson County's 531 square miles on soluble rock, 12 of them with the rock at or near the surface. With about 22,432 residents (42 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 308 map points about 1.3 miles apart, so a pocket smaller than that can be missed or overstated.

Counties around Anson County

The nearest county rated sinkhole country is Chesterfield County, SC, about 24 miles south, close enough that the same rock may run under the county line. 1 of the 6 closest counties land in the same band; the ground changes quickly around here.

Richmond County, NC 20 mi east · 20% at surface
Chesterfield County, SC 24 mi south · 63% at surface
Union County, NC 24 mi west · 0% at surface
Stanly County, NC 25 mi north · 0% at surface
Montgomery County, NC 27 mi northeast · 8% at surface
Marlboro County, SC 36 mi southeast · 64% at surface

What Anson County is built on

The largest mapped soluble unit here is the Terrace Deposits and Upland Sediment (terrace), Tertiary in age, covering about 1% of the county. Next is the Middendorf Formation at 1%.

Against the rest of North Carolina

Anson County ranks 58 of 100 in North Carolina for soluble rock at the surface, and sits above 58% of US counties on that measure.