A 48-hour closed-house test at the lowest lived-in level, placed and read by a New Jersey certified measurement business. The number everything else follows from.
It is one of the more common requests we route across Hunterdon County, NJ.
When this is the right question
- You finished a basement and want to know what you have been sitting in
- A previous test was done years ago and you have since changed the heating or the ventilation
- A buyer or a lender has asked for a radon test before closing
- A neighbour tested high and you have never tested at all
How it's normally done
A short-term test means a sealed-house condition for at least 48 hours with a continuous monitor or a pair of charcoal detectors placed at the lowest lived-in level. The house has to stay closed the whole time, which is the part that most often invalidates a result. In New Jersey the placement and the reading both have to be done by a certified measurement business for the result to count in a real-estate transaction.
Typical cost in Hunterdon County, NJ
$150 – $325 — typical range, not a quote. What your building needs can only be settled by a certified business that measures it on site.
New Jersey requires certification for this
Measurement is certified separately from mitigation. Under N.J.A.C. 7:28-27, testing for radon for a fee in New Jersey requires NJDEP certification as a radon measurement business. A crew certified to install systems is not thereby certified to place and read the detectors. We only route this work to businesses we have checked on the measurement side.
Reading the result
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
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.