Diagnosing why an existing system didn't get the number down, and fixing the actual cause rather than adding a bigger fan.
It is one of the more common requests we route across Hunterdon County, NJ.
What people describe first
- A fan mounted in a basement or a crawl space rather than outside conditioned space
- A system installed by the previous owner with no paperwork behind it
- A system is running but the re-test still came back above 4.0
- Pipework that discharges below the eaves or beside a window
How it's normally done
Most failed systems fail for a small number of reasons: too few suction points, a fan undersized for the pressure, discharge in the wrong place, or sealing that was never done. Diagnosis comes first — retrofitting a bigger fan onto a system with one point in the wrong place mostly just makes it louder.
Typical cost in Hunterdon County, NJ
$500 – $1,800 — typical range, not a quote. What your building needs can only be settled by a certified business that measures it on site.
What we confirm before anyone calls you
This is certified work in New Jersey, not general home improvement. We look up the business on the NJDEP radon register, confirm the mitigation certification is active, and record the date. Insurance is not part of that check, and nothing here should be read as confirming that any business carries liability cover. None of that is an endorsement of their workmanship — get more than one quote.
Never tested, and wondering whether to?
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
Where this applies
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.