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State overview
Radon in New Jersey
Of New Jersey's 21 counties and county equivalents, EPA places 7 in Zone 1, 11 in Zone 2, 3 in Zone 3. Zones are county-wide predictions; testing is the only way to know your home's level.
Radon in the news
New Jersey stories
- Radon on the radar — FHFA and State of New Jersey issue new radon standardsNixon Peabody · 2023-02-01
- Radon Investigated as Cause of Over 100 Brain Tumors at New Jersey SchoolNewsweek · 2022-04-26
Headlines link to the original publishers via Google News. Updated 2026-10-27.
All 21 counties
| County | EPA 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 |
Source: EPA radon zones spreadsheet (EPA 402/A-16/001).