Radon gas can also enter homes through the water supply. Radon dissolves and builds up in water from underground sources, such as wells. The radon in your water can enter the air in your home when you use water for household activities such as showering, washing clothes and cooking.
For every 10,000 picocuries per liter (pCi/L) of radon in your water, it is estimated that 1 pCi/L is added to your radon in the air. If your water comes from a lake, river, or reservoir (surface water), radon is not a concern. The radon is released into the air before it reaches your home.
Some radon stays in the water. Radon in the water you drink can also contribute to a very small increase in your risk of stomach cancer. However this risk is almost insignificant compared to your risk of lung cancer from radon.
For collection and analysis of radon in water, you should use the services of a qualified radon measurement professional and a lab approved by DPH to analyze radon in water (see below).
The Radon Program also maintains a list of nationally certified mitigation professionals who can reduce radon in water (see below).
Use the links below to find out more about radon in water:
Radon in Your Water (pdf) CT DPH Guidance Fact Sheet
- Nationally Certified Radon Measurement Professionals
- Nationally Certified Radon Mitigation Professionals
- A Comparison of Radon-in-Water Mitigation Systems (pdf)