A 90-day-to-a-year detector that returns an annual average instead of a weather-dependent snapshot. What a borderline short-term result deserves.
If this is what you are dealing with, you are not the first household in Hunterdon County to reach it.
What people describe first
- A short-term result landed between 2 and 4 pCi/L and you want to know the real annual average
- Two short-term tests in the same house disagreed with each other
- You want a year-round picture rather than a February snapshot
- You are deciding whether a borderline reading is worth acting on
How it's normally done
A long-term detector sits in place for 90 days to a year and returns an annual average rather than a single weather-dependent snapshot. It is the better measurement and the worse fit for a closing date, which is why it usually follows a short-term test rather than replacing one.
Typical cost in Hunterdon County, NJ
$175 – $400 — 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
Not sure whether your number is a problem?
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.
Tell us what you've got →Coverage
Towns where this is the right question
Only the ground where this is genuinely the right question — we do not generate a page for a service that makes no sense on a given bedrock.
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.