Sinkhole risk in Union 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%
What this means before you buy
No soluble bedrock is mapped here, so natural sinkholes are unlikely. Collapses from broken pipes or old mines are a separate risk.
Across 103 square miles, under one square mile of Union County maps onto soluble rock. With about 594,160 residents (5,782 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 604 map points about 0.4 miles apart, so a pocket smaller than that can be missed or overstated.
Read next: how these percentages are measured, and the warning signs that apply anywhere.
Counties around Union County
The nearest county rated sinkhole country is Union County, PA, about 145 miles west. 5 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.
- Essex County, NJ 9 mi north · 0% at surface
- Richmond County, NY 11 mi southeast · 0% at surface
- Hudson County, NJ 13 mi east · 0% at surface
- Middlesex County, NJ 16 mi south · 0% at surface
- Somerset County, NJ 18 mi west · under 1% at surface
- Morris County, NJ 19 mi northwest · 1% at surface
Against the rest of New Jersey
Union County ranks 21 of 21 in New Jersey for soluble rock at the surface, and sits above 0% of US counties on that measure.
- Salem County 15%
- Monmouth County 13%
- Warren County 10%
- Gloucester County 9%
- Camden County 6%