Sinkhole risk in Williamsburg County, SC: Pockets of it

Pockets of it

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

On soluble rock: 100%
At or near the surface: 31%
Buried under cover: 69%

What this means before you buy

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 934 of Williamsburg County's 934 square miles on soluble rock, 287 of them with the rock at or near the surface. With about 29,865 residents (32 per square mile), there is effectively nowhere in the county off the soluble rock, town or country. The figures come from 521 map points about 1.3 miles apart, so a pocket smaller than that can be missed or overstated.

Worth reading for this county: why the 69% under cover still counts, and the signs to look for and how an inspection works.

Counties around Williamsburg County

The nearest county rated sinkhole country is Florence County, SC, about 28 miles north, 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.

Florence County, SC 28 mi north · 77% at surface
Georgetown County, SC 28 mi southeast · 0% at surface
Clarendon County, SC 29 mi west · 79% at surface
Berkeley County, SC 32 mi southwest · 30% at surface
Marion County, SC 38 mi northeast · 33% at surface
Sumter County, SC 43 mi northwest · 77% at surface

Against the rest of South Carolina

Williamsburg County ranks 21 of 46 in South Carolina for soluble rock at the surface, and sits above 80% of US counties on that measure.