Radon in New Jersey
We don't have lab test results for New Jersey yet. EPA zones for every county are below.
The EPA puts 7 of New Jersey's 21 counties in Zone 1, its highest radon category, 11 in Zone 2 and 3 in Zone 3.
Every county in New Jersey
Sorted by the share of homes tested at or above 4 pCi/L. Select a county for local details and costs.
| County | Homes tested | At or above 4 | Median | EPA zone |
|---|---|---|---|---|
| Atlantic County | No data | – | – | 3 |
| Bergen County | No data | – | – | 2 |
| Burlington County | No data | – | – | 2 |
| Camden County | No data | – | – | 2 |
| Cape May County | No data | – | – | 3 |
| Cumberland County | No data | – | – | 2 |
| Essex County | No data | – | – | 2 |
| Gloucester County | No data | – | – | 2 |
| Hudson County | No data | – | – | 2 |
| Hunterdon County | No data | – | – | 1 |
| Mercer County | No data | – | – | 1 |
| Middlesex County | No data | – | – | 2 |
| Monmouth County | No data | – | – | 1 |
| Morris County | No data | – | – | 1 |
| Ocean County | No data | – | – | 3 |
| Passaic County | No data | – | – | 2 |
| Salem County | No data | – | – | 2 |
| Somerset County | No data | – | – | 1 |
| Sussex County | No data | – | – | 1 |
| Union County | No data | – | – | 2 |
| Warren County | No data | – | – | 1 |
"–" means fewer than 20 tests or no lab data, too few for a reliable figure.
Sources
- EPA Map of Radon Zones (public domain).
Last updated October 2026. How we calculate these numbers.