Sinkhole risk in Plymouth County, MA: 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 to do about a house in Plymouth County

No soluble bedrock is mapped here, so natural sinkholes are unlikely. Collapses from broken pipes or old mines are a separate risk.

Across 659 square miles, under one square mile of Plymouth County maps onto soluble rock. With about 542,090 residents (823 per square mile), most of the county is built up, so a mapped unit is likely to sit under somebody's street. The figures come from 545 map points about 1.1 miles apart, so a pocket smaller than that can be missed or overstated.

Two things to read before deciding: how these percentages are measured, and the warning signs that apply anywhere.

Counties around Plymouth County

The nearest county rated sinkhole country is Union County, PA, about 334 miles west. 5 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Bristol County, MA 24 mi southwest · 0% at surface
Norfolk County, MA 26 mi northwest · 0% at surface
Suffolk County, MA 28 mi northwest · 0% at surface
Bristol County, RI 34 mi southwest · 0% at surface
Barnstable County, MA 35 mi southeast · 0% at surface
Dukes County, MA 42 mi south · 0% at surface

Against the rest of Massachusetts

Plymouth County ranks 12 of 14 in Massachusetts for soluble rock at the surface, and sits above 0% of US counties on that measure.