Sinkhole risk in Berkshire County, MA: 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: 32%
At or near the surface: 0%
Buried under cover: 32%

What this means before you buy

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

That works out to roughly 297 of Berkshire County's 927 square miles on soluble rock. With about 128,726 residents (139 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 269 map points about 1.9 miles apart, so a pocket smaller than that can be missed or overstated.

Counties around Berkshire County

The nearest county rated sinkhole country is Union County, PA, about 221 miles southwest. 4 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Columbia County, NY 23 mi west · 0% at surface
Rensselaer County, NY 28 mi northwest · 0% at surface
Hampshire County, MA 28 mi east · 0% at surface
Hampden County, MA 34 mi southeast · 0% at surface
Franklin County, MA 35 mi northeast · 0% at surface
Northwest Hills Planning Region, CT 36 mi south · 0% at surface

Which formation it is

The largest mapped soluble unit here is the Stockbridge Formation (marble), Lower Cambrian in age, covering about 16% of the county. Next is the Stockbridge Formation at 12%.

Against the rest of Massachusetts

Berkshire County ranks 2 of 14 in Massachusetts for soluble rock at the surface, and sits above 0% of US counties on that measure.