Sinkhole risk in Strafford County, NH: 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 Strafford County

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

Across 367 square miles, under one square mile of Strafford County maps onto soluble rock. With about 134,202 residents (365 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 575 map points about 0.8 miles apart, so a pocket smaller than that can be missed or overstated.

Counties around Strafford County

The nearest county rated sinkhole country is Union County, PA, about 348 miles southwest. 6 of the 6 closest counties land in the same band, so this is a regional pattern rather than a local quirk.

York County, ME 21 mi northeast · 0% at surface
Rockingham County, NH 21 mi south · 0% at surface
Belknap County, NH 25 mi northwest · 0% at surface
Merrimack County, NH 32 mi west · 0% at surface
Carroll County, NH 41 mi north · 0% at surface
Hillsborough County, NH 44 mi southwest · 0% at surface

Against the rest of New Hampshire

Strafford County ranks 9 of 10 in New Hampshire for soluble rock at the surface, and sits above 0% of US counties on that measure.