Radon in New Jersey well water
In New Jersey, radon was detected in 99% of 864 tested private well samples.
Radon is a radioactive gas released from bedrock into well water. It escapes into household air during showers and washing, where inhaling it raises lung cancer risk. EPA has no enforceable water MCL; New Hampshire recommends treatment above 2,000 pCi/L, and many states use 4,000 pCi/L.
Check your radon number
Type the value from your lab report. It is compared to the EPA limit, the same way the full interpretation does it.
Getting it fixed
Book a free in-home water test with a licensed local company, or see the treatment guide for what removes radon.
By county, from individual samples
Public monitoring samples against the EPA limit; counties with at least 30 samples.
| County | Samples | Detected | Above EPA limit | Median | Highest |
|---|---|---|---|---|---|
| Atlantic | 36 | 100% | no limit | 210 | 820 pCi/L |
| Bergen | 32 | 100% | no limit | 2,025 | 8,700 pCi/L |
| Hunterdon | 61 | 100% | no limit | 2,560 | 38,300 pCi/L |
| Middlesex | 42 | 100% | no limit | 1,570 | 15,000 pCi/L |
| Morris | 34 | 100% | no limit | 1,555 | 31,800 pCi/L |
| Sussex | 59 | 100% | no limit | 1,450 | 90,000 pCi/L |
| Gloucester | 106 | 99% | no limit | 255 | 1,100 pCi/L |
| Mercer | 94 | 99% | no limit | 1,020 | 39,200 pCi/L |
| Ocean | 78 | 99% | no limit | 210 | 1,010 pCi/L |
| Camden | 64 | 98% | no limit | 184 | 3,170 pCi/L |
| Salem | 57 | 98% | no limit | 450 | 1,840 pCi/L |
| Cumberland | 135 | 96% | no limit | 280 | 3,900 pCi/L |
- West Amwell township, Hunterdon County100% detected of 47
- Ewing township, Mercer County100% detected of 58
- Byram township, Sussex County100% detected of 31
- Upper Deerfield township, Cumberland County97% detected of 39
- Monroe township, Gloucester County97% detected of 31
- Toms River township, Ocean County97% detected of 31
Sources
- Individual samples from the USGS Water Quality Portal and state monitoring, summarized per geography. radon counts and shares are listed on each county and town page with their sources.