New Jersey · EPA radon zones
Radon risk in New Jersey
Zone 1 (highest — avg ≥ 4 pCi/L). Zone 1 in central + western NJ, Zone 2-3 in coastal counties.
The EPA Map of Radon Zones is published as a planning tool — not a prediction of any single home's reading. Even in Zone 3 states, individual basements can test well above the 4 pCi/L action level, and a Zone 1 designation doesn't mean every home is high. Always test the specific home you live in or are buying.
For homes in New Jersey, a short-term test ($15-50, 2-7 days) gives a quick baseline, and a long-term test (90+ days) gives the most accurate annual-average reading. Continuous radon monitors are increasingly popular for ongoing surveillance.
Source: EPA Map of Radon Zones