Sinkhole risk in Halifax County, NC: Pockets of it

Pockets of it

Soluble rock at the surface or under thin cover in part of the county.

On soluble rock: 24%
At or near the surface: 24%
Buried under cover: 0%

The next step for one property

Check the parcel against your state survey sinkhole map, and ask for an inspection if cracks, depressions or sticking doors show up.

That works out to roughly 171 of Halifax County's 724 square miles on soluble rock, 171 of them with the rock at or near the surface. With about 46,992 residents (65 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 509 map points about 1.2 miles apart, so a pocket smaller than that can be missed or overstated.

Two things to read before deciding: the signs to look for and how an inspection works, and how these percentages are measured.

Counties around Halifax County

The nearest county rated sinkhole country is Edgecombe County, NC, about 23 miles south, close enough that the same rock may run under the county line. 2 of the 6 closest counties land in the same band; the ground changes quickly around here.

Northampton County, NC 18 mi northeast · 34% at surface
Edgecombe County, NC 23 mi south · 62% at surface
Warren County, NC 27 mi west · 0% at surface
Nash County, NC 27 mi southwest · 16% at surface
Greensville County, VA 30 mi north · 2% at surface
Emporia city, VA 31 mi north · 0% at surface

What Halifax County is built on

The largest mapped soluble unit here is the Yorktown Formation and Duplin Formation, Undivided (clay or mud), Tertiary in age, covering about 24% of the county.

Against the rest of North Carolina

Halifax County ranks 31 of 100 in North Carolina for soluble rock at the surface, and sits above 77% of US counties on that measure.