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Radon zones in New Jersey

The EPA assigns every county in New Jersey to one of three radon potential zones. 7 are in Zone 1, the highest category, home to about 24% of the state's residents.

21
Counties
7
Zone 1 counties
Predicted average above 4 pCi/L
11
Zone 2 counties
Predicted average 2-4 pCi/L
3
Zone 3 counties
Predicted average below 2 pCi/L

The map

Radon potential across New Jersey

Every county in New Jersey, filled by the zone the EPA assigns it. Zones follow geology rather than county lines, so the colour usually changes where the bedrock does, not where the border is.

Zone 1 · 7Zone 2 · 11Zone 3 · 3

Hover a county · click to open it

County by county

All 21 New Jersey counties

Zone 1 · > 4 pCi/LZone 2 · 2 - 4 pCi/LZone 3 · < 2 pCi/L
CountyZonePopulationCOPDSmokingLung ca. deaths
Hunterdon County1130k4.9%8.8%20.7
Mercer County1382k4.9%10.5%24.6
Monmouth County1643k5.0%9.7%27.4
Morris County1514k4.2%8.4%21.3
Somerset County1349k4.1%8.2%20.6
Sussex County1146k5.4%11.2%31.6
Warren County1111k5.8%11.6%34.2
Bergen County2958k4.4%8.4%21.5
Burlington County2469k5.2%10.9%29.0
Camden County2527k5.7%13.1%31.9
Cumberland County2152k7.4%16.5%39.4
Essex County2851k5.5%12.4%19.7
Gloucester County2308k5.4%11.9%33.4
Hudson County2705k4.1%10.6%20.5
Middlesex County2864k4.4%10.0%23.8
Passaic County2513k5.8%12.3%22.8
Salem County265k7.2%14.7%44.3
Union County2573k5.0%11.4%19.8
Atlantic County3275k6.5%12.9%32.9
Cape May County395k7.2%11.8%32.9
Ocean County3659k6.8%13.3%34.7

Zones from the EPA Map of Radon Zones. COPD and smoking are CDC PLACES model-based estimates of adult prevalence. Lung cancer death rates are age-adjusted deaths per 100,000 per year, 2019-2023, from NCI State Cancer Profiles. A dash means the source does not report a value for that county.

Highest potential

Zone 1 counties in New Jersey

These 7 counties have a predicted average indoor radon screening level above the EPA action level. The EPA recommends every home in them be tested.

Other states

Radon zones elsewhere