Radon note for Mercer County: 4 municipalities here are NJDEP Tier 1 (high radon potential). Testing is the only way to know your home's level — see your town's published test data:
5120 homes tested · 29% ≥ 4 pCi/L
6519 homes tested · 33% ≥ 4 pCi/L
7470 homes tested · 26% ≥ 4 pCi/L
12615 homes tested · 34% ≥ 4 pCi/L
| Company | Location | Certifications | License # |
|---|---|---|---|
| Radon Shield LLC | Trenton, NJ | mitigation | MIB93374 |
1 company in the NJDEP Radon Certification Program is based in Mercer County as of 2026-07-17. Companies based elsewhere in New Jersey also commonly serve the county.
NJDEP designates 4 Mercer County municipalities as Tier 1 (high radon potential): Ewing Township, Hopewell Borough and Hopewell Township and Pennington Borough, Lawrence Township, Princeton Boro and Princeton Township.
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