New Jersey Department of Environmental Protection — Radon Section
New Jersey radon (air)
No current public DEP certified-business roster to republish. Updated 2026-09-18 (US/Pacific).
If you are not sure you need a pro yet, see when a DIY radon test kit is enough or how to test a home for radon.
By law, businesses and professionals that measure or mitigate radon in New Jersey must be DEP-certified under N.J.A.C. 7:28-27. NJDEP’s Radon Section regulates those certifications, but as of 2026-09-18 it does not publish a current downloadable public statewide roster of certified businesses or individuals that this index can copy.
This page does not invent company names, phones, licenses, or addresses. It does not scrape NRPP, NRSB, or third-party directories into a fake “state roster.” A standalone certified-business PDF found online dated 01/06/2010 is stale and is not used here.
Ask any tester or mitigator for their separate business and individual DEP certification numbers and dates, then verify with the Radon Section before hiring. National NRPP/NRSB credentials support training and exams NJDEP references, but they are not a substitute for current New Jersey DEP certification where the state requires it.
What homeowners can do
- Radon is a radioactive gas from uranium in soil and rock. You cannot see or smell it — testing indoor air is the only way to know a building’s level. This page covers indoor air, not well water.
- DEP and EPA both recommend mitigating if confirmed indoor-air results are 4 pCi/L or higher. DEP also recommends that all homes be tested; municipal radon-potential maps are context only, not a substitute for a home test.
- Homeowners may test their own homes. Retail kits sold in New Jersey should show the producer’s NJDEP measurement-business certification number; official guidance has long stated that number often begins with MEB9 followed by four digits. Confirm the label and, if needed, check with the Radon Section.
- If you hire someone, they must be DEP-certified. Check their DEP certificate (name, certification number, and certification dates) or call the Radon Public Information Line.
- Free or low-cost kits are sometimes available through municipal or county health departments — ask locally, or purchase from a hardware store or a NJ-certified radon business.
- Questions or to verify a certification number: NJDEP Radon Section. Radon Public Information Line 800-648-0394; office 609-984-5425; fax 609-984-5595; radon@dep.nj.gov. Mail: Mail Code 25-01, P.O. Box 420, Trenton, NJ 08625-0420. Courier: 25 Arctic Pkwy, Ewing, NJ 08638.
- Optional secondary national lookups (not a NJ license substitute): NRPP Find a Pro or NRSB Find a Pro — then still verify DEP certification with the Radon Section.
Official sources
- NJDEP Radiation Protection Element — Radon (retrieved 2026-09-18; live hub confirmed via Wayback snapshot 20260918013502 when Incapsula blocked direct fetch)
- NJDEP — Radon Testing (retrieved 2026-09-18)
- NJDEP — Radon Business Certification (retrieved 2026-09-18)
- NJDEP — Radon Professional Certification (retrieved 2026-09-18; N.J.A.C. 7:28-27; NRPP/NRSB training and exam links)
- NJDEP — Radon Testing Certification FAQ (retrieved 2026-09-18; credential = name, number, dates; amendments via radon@dep.nj.gov)
- NJDEP Radiation Protection Element — Contact Us (retrieved 2026-09-18; Radon Public Information Line 800-648-0394)
- NJDEP — Initial Radon Measurement Business Certification Application (PDF, January 2023) (retrieved 2026-09-18; lists 609-984-5425 and mailing addresses)
- NJDEP — Radon: Frequently Asked Questions (PDF) (retrieved 2026-09-18; MEB9 kit-label note and info-line guidance; older brochure — verify current details with the Radon Section)
- NRPP Find a Pro (secondary; linked from NJDEP professional certification materials for courses/exams)
- NRSB Find a Pro (secondary; linked from NJDEP professional certification materials for courses/exams)
- U.S. EPA Radon
This index does not rank contractors or take referral fees. No Amazon kit links on this state page.