Radon zones in New Jersey
Last updated
EPA’s Map of Radon Zones places 21 New Jersey counties in its three radon potential zones: 7 in Zone 1 (highest), 11 in Zone 2 (moderate), and 3 in Zone 3 (low).
What this means for New Jersey homes
Most New Jersey counties fall in Zone 2. EPA predicts moderate average indoor levels (2 to 4 pCi/L) across much of New Jersey. Many homes will be below the action level, but many will not, and only a test can tell which.
EPA’s guidance is the same everywhere: test your home, fix it if the level is 4 pCi/L or higher, and consider fixing between 2 and 4 pCi/L. The zone map is from 1993 and should not be used to decide whether a single home needs testing.
New Jersey radon program
EPA lists the following state contact for New Jersey: NJ Dept. of Environmental Protection, Radiation Protection & Release Protection Program, phone 609-984-5425. Website: www.state.nj.us/dep/rpp/radon/index.htm. State programs can tell you about local testing data, free or discounted test kits, disclosure rules for home sales, and credentialed radon professionals.
New Jersey counties and their EPA radon zones
| County | EPA radon zone |
|---|---|
| Atlantic County | Zone 3 |
| Bergen County | Zone 2 |
| Burlington County | Zone 2 |
| Camden County | Zone 2 |
| Cape May County | Zone 3 |
| Cumberland County | Zone 2 |
| Essex County | Zone 2 |
| Gloucester County | Zone 2 |
| Hudson County | Zone 2 |
| Hunterdon County | Zone 1 |
| Mercer County | Zone 1 |
| Middlesex County | Zone 2 |
| Monmouth County | Zone 1 |
| Morris County | Zone 1 |
| Ocean County | Zone 3 |
| Passaic County | Zone 2 |
| Salem County | Zone 2 |
| Somerset County | Zone 1 |
| Sussex County | Zone 1 |
| Union County | Zone 2 |
| Warren County | Zone 1 |
County names follow the 2020 Census. Zones from the EPA Map of Radon Zones (text version). Rows marked “zone of” use the zone EPA gave the predecessor or surrounding county.
Next steps: read how to test your home, check a result with the level calculator, or look up a single address by ZIP code.