Sealing the sump and drawing suction through an existing perimeter drain loop. Efficient where the drainage is already there.
It is one of the more common requests we route across Hunterdon County, NJ.
When this is the right question
- A basement that has both a water problem and a radon problem
- A drain-tile loop that already runs the full perimeter
- An interior perimeter drain or a French drain around the basement floor
- An open sump pit with no sealed cover
The usual approach
Where a perimeter drain already circles the footing, it is an existing distribution network for suction. The pit gets a sealed, gasketed cover with a viewing port and a pipe fitting, and the fan draws through the loop. It is often the cheapest effective system in a house that has one — and it has to be built so the pump can still be serviced.
Typical cost in Hunterdon County, NJ
$1,400 – $2,800 — typical range, not a quote. What your building needs can only be settled by a certified business that measures it on site.
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.
Want to know what a fix would actually cost?
Write down what the system is doing and what the re-test said. We'll get it to crews who diagnose rather than guess.
Tell us what you've got →Coverage
Towns where this is the right question
These are the towns whose geology and housing stock actually put this on the table.
Highlands ridge and limestone valley
Precambrian gneiss and granite of the Reading Prong, cut by carbonate valleys. The highest-potential ground in the county, and almost all of it on private wells.
Newark Basin shale country
Red shale and mudstone of the Passaic Formation under Flemington and the centre of the county. Fractured rock, plenty of basements, and a mix of public water and wells.
Diabase uplands and the Delaware corridor
Sourland-type diabase and the dark argillite of the Lockatong Formation. Stone farmhouses, open crawl spaces, and river-town cellars cut into rock.