New Jersey Radon Levels
7Zone 1 (High)
11Zone 2 (Moderate)
3Zone 3 (Low)
33% of counties in New Jersey are classified as EPA Zone 1 (highest radon potential), meaning predicted average indoor radon levels exceed 4 pCi/L — the EPA action level. The EPA recommends that all homes be tested for radon, regardless of zone classification.
| County | EPA Zone | Risk Level |
|---|---|---|
| Atlantic County | Zone 3 | Lowest Potential |
| Bergen County | Zone 2 | Moderate Potential |
| Burlington County | Zone 2 | Moderate Potential |
| Camden County | Zone 2 | Moderate Potential |
| Cape May County | Zone 3 | Lowest Potential |
| Cumberland County | Zone 2 | Moderate Potential |
| Essex County | Zone 2 | Moderate Potential |
| Gloucester County | Zone 2 | Moderate Potential |
| Hudson County | Zone 2 | Moderate Potential |
| Hunterdon County | Zone 1 | Highest Potential |
| Mercer County | Zone 1 | Highest Potential |
| Middlesex County | Zone 2 | Moderate Potential |
| Monmouth County | Zone 1 | Highest Potential |
| Morris County | Zone 1 | Highest Potential |
| Ocean County | Zone 3 | Lowest Potential |
| Passaic County | Zone 2 | Moderate Potential |
| Salem County | Zone 2 | Moderate Potential |
| Somerset County | Zone 1 | Highest Potential |
| Sussex County | Zone 1 | Highest Potential |
| Union County | Zone 2 | Moderate Potential |
| Warren County | Zone 1 | Highest Potential |