Ringoes owners ask about block-wall depressurization more than you would think for a town this size.
What people describe first
- A system that was installed under the slab and only got the reading part of the way down
- A hollow concrete-block foundation wall
- An older block wall with an open top course
Why this comes up in Ringoes
Public supply is not the norm around Ringoes. A well here draws from the northern edge of the Sourland diabase, which is also what the suction test has to contend with.
East Amwell Township — the state's own numbers
43% of the 1,314 test results NJDEP holds for East Amwell Township were at or above the 4.0 pCi/L action level — 567 of them. That puts it in Tier 1 — high potential.
One of the oldest settlements in the county, with 18th and 19th century houses around the crossroads and farmsteads on the surrounding land.
What access looks like here
Village lots are modest; the surrounding farm properties have ample room.
East Amwell Township handles permitting for work at this address.
The usual approach
Hollow block walls are a network of interconnected voids running from the footing to the top course, and soil gas uses them as a chimney. Treating them means sealing the top course and drawing suction from inside the cavity, usually alongside a sub-slab system rather than instead of one.
Typical cost in Hunterdon County, NJ
$1,800 – $3,200 — typical range, not a quote. What your building needs can only be settled by a certified business that measures it on site.
A crew that works East Amwell Township regularly will have met this pattern before.
Who is allowed to do this in New Jersey
Under N.J.A.C. 7:28-27 this is not work a general contractor may take on. It requires a business certified by NJDEP for radon mitigation, with a certified mitigation specialist directing the work. We verify that on the state register, note the date, and route accordingly — but a verified certification is a fact, not a recommendation.
Never tested, and wondering whether to?
Give us the short version and the timeline. We'll put it in front of crews who can work to it, and tell you honestly if nobody can.
Get quotes in Ringoes →Related
Also common in Ringoes
Other work in Ringoes
Same ground, different question.
Block-wall depressurization nearby
Neighbouring towns on the same ground.