Counties
- Under 10%
- 10–20%
- 20–30%
- 30–40%
- 40% or more
| County | Tests | % ≥ 4 pCi/L | Median (pCi/L) | EPA zone (1993) | Source |
|---|---|---|---|---|---|
| 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 | — |
Test your home
County figures show how often tests come back high, not the level in your home. Only a test tells you that: see how to test for radon.
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