Radon mitigation specialists in Hunterdon County
Hunterdon is a Tier 1 county, NJDEP's highest radon-potential tier, meaning at least a quarter of tested homes here come back over the EPA's action level. State radon certification is mandatory for this work.
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Find a radon mitigation specialist →What it costs
A standard sub-slab depressurization system runs $1,000 to $2,000 for most New Jersey homes, with straightforward colonial, split-level, or ranch installs on a slab or poured basement typically landing in the $1,000 to $1,800 range. Crawlspaces or unusual foundations that need sealing work push installs to $2,000 to $3,500. Add $150 to $700 for the radon test itself and $25 to $150 for the township permit. (HomeGuide and FindRadonPros NJ cost guides, 2026.)
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Before you sign anything
- Ask for the NJDEP radon mitigation business certification number and the name of the certified specialist affiliated with it, then check it yourself at nj.gov/dep/rpp/radon. This is a state certification, not a voluntary credential.
- Get a radon test before and after mitigation from a certified measurement provider, ideally not the same company doing the mitigation work, so you're not grading your own homework.
- Ask what system type they're proposing (sub-slab depressurization is standard) and why, given your foundation. Crawlspaces and sump pits change the design and the price.
- Get the fan model and warranty in writing. Radon fans run continuously for years; a cheap one that fails silently defeats the whole system.
- If you're buying a home, a Tier 1 county makes a radon test worth doing even when it isn't required, ask for the seller's most recent test result and don't assume an old test still reflects current levels.
Radon testing and mitigation businesses, and the individuals who work for them, must be certified by NJDEP under N.J.A.C. 7:28-27. A certified mitigation business must affiliate with a certified radon mitigation specialist and renew annually. This is a separate registry from the contractor board; look it up at nj.gov/dep/rpp/radon.
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The local picture
Radon mitigation is a licensed niche, not every HVAC or contractor company that says it does radon actually carries the NJDEP certification. Cross-check the certification before the sales pitch.
Questions neighbors actually ask
Does my radon mitigation contractor need to be certified in New Jersey?
Yes. New Jersey requires both radon measurement and radon mitigation businesses, and the individuals working under them, to be certified by the NJDEP under N.J.A.C. 7:28-27. A certified mitigation business must affiliate with a certified radon mitigation specialist and file an annual renewal. Verify the certification at nj.gov/dep/rpp/radon before signing anything, general contractor or HVAC licensing does not cover this work.
Is radon really a bigger deal in Hunterdon County?
Yes. NJDEP classifies Hunterdon as Tier 1, its highest radon-potential category, meaning at least 25 percent of tested homes come back at or above the EPA's action level of 4 pCi/L (NJDEP Radon Potential Map). Radon varies by lot even within a Tier 1 county, so a neighbor's clean test doesn't clear your house, get your own test.
Do I need a permit for a radon mitigation system?
Most New Jersey townships require one, budget $25 to $150 for it. A legitimate installer either pulls it themselves or tells you clearly that it's on you, either way it should be part of the written scope before work starts.
How do I know the mitigation system actually worked?
Get a post-mitigation test, ideally from a certified measurement provider other than the company that installed the system. A conflict-of-interest test (the installer grading their own work) is a weaker verification than an independent one, and it's a normal, inexpensive ask.
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The Hunterdon Scoop business directory has every Hunterdon County business we know of, browsable by town. Browse Home Services & Trades →
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