Radon in Texas well water
In Texas, radon was detected in 95% of 655 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 |
|---|---|---|---|---|---|
| Harris | 86 | 100% | no limit | 635 | 2,510 pCi/L |
| Comal | 31 | 94% | no limit | 350 | 780 pCi/L |
| Uvalde | 35 | 91% | no limit | 290 | 1,040 pCi/L |
| Bexar | 40 | 83% | no limit | 78.5 | 570 pCi/L |
| Medina | 36 | 64% | no limit | 105 | 2,010 pCi/L |
- Houston CCD, Harris County100% detected of 71
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.