Sinkhole risk in Middlesex County, NJ: 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%

The next step for one property

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

Across 309 square miles, under one square mile of Middlesex County maps onto soluble rock. With about 890,119 residents (2,878 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 610 map points about 0.7 miles apart, so a pocket smaller than that can be missed or overstated.

Worth reading for this county: how these percentages are measured, and the warning signs that apply anywhere.

Counties around Middlesex County

The nearest county rated sinkhole country is Union County, PA, about 143 miles west. 5 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

Somerset County, NJ 14 mi northwest · under 1% at surface
Union County, NJ 16 mi north · 0% at surface
Richmond County, NY 16 mi northeast · 0% at surface
Monmouth County, NJ 17 mi southeast · 13% at surface
Mercer County, NJ 19 mi southwest · 0% at surface
Essex County, NJ 25 mi north · 0% at surface

Against the rest of New Jersey

Middlesex County ranks 18 of 21 in New Jersey for soluble rock at the surface, and sits above 0% of US counties on that measure.