Radon in Pennsylvania well water
In Pennsylvania, radon was detected in 99% of 2,590 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.
Test your Pennsylvania well for radon
Certified lab analysis of your own tap water, bottles and prepaid return shipping included. The Essential well panel covers arsenic, uranium, nitrate, lead, copper, manganese, iron, sodium and bacteria; radon and PFAS are add-ons.
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Getting it fixed
Book a free in-home water test with a licensed local company, or see the treatment guide for what removes radon.
Where to get a well tested for radon in Pennsylvania: certified labs, state programs and prices.
By county, from individual samples
Public monitoring samples against the EPA limit; counties with at least 30 samples.
| County | Above EPA limit | Samples | Detected | Median | Highest |
|---|---|---|---|---|---|
| Bradford | no limit | 80 | 100% | 635 | 8,500 pCi/L |
| Cumberland | no limit | 49 | 100% | 500 | 7,050 pCi/L |
| Dauphin | no limit | 48 | 100% | 1,800 | 4,600 pCi/L |
| Montgomery | no limit | 66 | 100% | 1,755 | 5,080 pCi/L |
| Pike | no limit | 245 | 100% | 1,130 | 5,100 pCi/L |
| Sullivan | no limit | 44 | 100% | 1,000 | 15,300 pCi/L |
| Wayne | no limit | 221 | 100% | 2,090 | 7,400 pCi/L |
| York | no limit | 66 | 100% | 2,115 | 28,500 pCi/L |
| Chester | no limit | 770 | 99% | 1,700 | 53,000 pCi/L |
| Bucks | no limit | 143 | 99% | 1,300 | 14,000 pCi/L |
| Clinton | no limit | 63 | 98% | 500 | 3,990 pCi/L |
| Lancaster | no limit | 170 | 98% | 1,200 | 38,000 pCi/L |
| Potter | no limit | 48 | 98% | 905 | 3,140 pCi/L |
| Jefferson | no limit | 42 | 98% | 155 | 1,900 pCi/L |
| Lycoming | no limit | 82 | 96% | 770 | 7,400 pCi/L |
- Salisbury township, Lancaster County100% detected of 33
- New Garden township, Chester County100% detected of 43
- Kennett township, Chester County100% detected of 42
- Charlestown township, Chester County100% detected of 74
- West Caln township, Chester County100% detected of 52
- East Brandywine township, Chester County100% detected of 35
- East Marlborough township, Chester County100% detected of 45
- Dingman township, Pike County100% detected of 49
- Lackawaxen township, Pike County100% detected of 56
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.