Radon Levels in New Jersey
New Jersey is classified as an EPA Zone 1 state with a high risk for radon. Average indoor radon levels range from 2 to 6 pCi/L, and approximately 32% of New Jersey homes test above the EPA action level of 4.0 pCi/L.
New Jersey Radon Summary
High Radon Risk State
New Jersey is among the higher-risk states for residential radon. The New Jersey Department of Health strongly recommends that all residents test their homes. If you have not tested your home, consider ordering a test kit or radon detector today.
Key Facts About Radon in New Jersey
- New Jersey has significant radon risk, particularly in the northern counties
- The Highlands region (Morris, Sussex, Passaic counties) has the highest levels
- NJ DEP requires radon-resistant construction in new homes
- NJ requires certified radon professionals for testing and mitigation
New Jersey Testing Requirements & Recommendations
New Jersey requires radon disclosure in real estate sales. Testing is required in many counties before closing.
New Jersey has one of the strictest radon contractor certification programs in the country.
Major Cities in New Jersey
Radon levels can vary significantly within New Jersey depending on local geology. All residents — regardless of city — should test their specific home, as neighborhood-level radon varies independently of broader state and county averages.
What Should New Jersey Residents Do?
Test Your Home
Use a short-term charcoal test kit ($15–$25) for an initial reading, or a continuous radon detector for ongoing monitoring. Test in your basement or lowest livable area.
Understand Your Result
If your result is below 2.0 pCi/L: monitor periodically. Between 2.0–4.0 pCi/L: consider mitigation. Above 4.0 pCi/L: the EPA recommends mitigation. Above 8.0 pCi/L: take action promptly.
Hire a Certified Contractor if Needed
Look for NRPP or NRSB-certified radon mitigation contractors in New Jersey. Mitigation systems typically cost $800–$2,500 and can reduce radon levels by 50–99%.
Verify with a Follow-Up Test
After mitigation, test again to confirm the system is working. Retest every 2 years, or after significant home renovations.
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