2026-05-14 · 5 min read
Radon Mitigation Cost in New Jersey (2026)
New Jersey averages 4.2 pCi/L with extreme concentrations in northern counties over the Reading Prong. Here's what mitigation costs across the state.
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
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.
Find a Certified Mitigator Near You
Every contractor on RadonBase is NRPP or NRSB certified — mitigators only, no testers.
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