Radon Mitigation Cost in New Jersey (2026)
New Jersey Radon at a Glance
New Jersey averages 4.2 pCi/L statewide, but this average masks extreme variation. The northern counties over the Reading Prong rank among the highest-radon areas in the United States. Southern New Jersey along the coastal plain runs much lower.
The NJDEP estimates approximately 30% of NJ homes test above 4 pCi/L, with much higher rates in Morris, Warren, Sussex, and Hunterdon counties.
New Jersey Licensing Requirement
New Jersey requires certification for radon mitigators through NJDEP. This creates a higher baseline of quality and accountability. The NJDEP maintains a searchable certified contractor list at nj.gov/dep/rpp.
Never hire an uncertified contractor in New Jersey — it's illegal and may invalidate insurance coverage.
What Mitigation Costs in New Jersey
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Find a mitigator in New Jersey →New Jersey runs higher than the Midwest average due to higher labor costs and the complexity of northern NJ homes.
Slab or Basement: $1,000–$2,400
- Standard basement, Central NJ (Somerset, Middlesex): $1,000–$1,700
- North Jersey (Morris, Sussex, Warren — Reading Prong): $1,200–$2,400
- Finished basement, complex routing: $1,500–$2,600
- South Jersey: $950–$1,800
Crawl Space: $3,000–$7,000
- Basic crawl space: $3,000–$4,500
- With vapor barrier: $3,500–$5,500
- North Jersey complex access: $4,500–$7,000
Reading Prong Premium
Homes in Morris, Warren, and Sussex counties with extremely high radon (common above 10 pCi/L) often need upgraded equipment:
- High-suction GX3 or GX5 fan instead of standard XP201: adds $80–$135
- Multiple suction points for very high levels: adds $500–$900
- Post-install test required by NJ code in many jurisdictions
New Jersey Resources
- NJDEP Radon Program: nj.gov/dep/rpp or 800-648-0394
- Certified contractor search: nj.gov/dep/rpp
- Verify NRPP: radonproficiency.org
Frequently Asked Questions
How much does radon mitigation cost in New Jersey?
New Jersey homeowners typically pay $1,000–$2,400 for a standard basement job — one of the higher-priced states due to NJ labor costs and licensing requirements. Crawl spaces run $3,000–$7,000.
Which New Jersey counties have the highest radon?
Morris, Warren, Sussex, and Hunterdon counties in northern New Jersey sit directly on the Reading Prong — the same uranium-bearing rock belt that runs through southeastern Pennsylvania. These counties routinely test 10–100+ pCi/L. Passaic, Bergen, and Somerset counties also run above average.
Does New Jersey require a licensed radon contractor?
Yes. New Jersey requires radon mitigators to be certified by the NJ Department of Environmental Protection (NJDEP). This is one of the stricter state programs — verify any contractor at nj.gov/dep/rpp before hiring.
Is radon a concern in South Jersey and the shore?
Less so than North Jersey. South Jersey counties (Cape May, Atlantic, Cumberland, Salem) average 1.5–2.5 pCi/L due to coastal plain sandy soil geology. Shore-area homes are generally lower risk, but still worth testing — especially homes with basements in Burlington and Camden counties.
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