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Any time you use water, radon is released:

• Showers release the most radon (hot water + agitation)
• Dishwashers, washing machines, and faucets also release radon
• Even flushing toilets release small amounts

The EPA estimates that 10,000 pCi/L in your water adds about 1 pCi/L to your indoor air.

The main risk is inhalation, not ingestion. When radon is released from water into your home's air, you inhale it. Drinking water with radon poses much less risk than breathing radon gas.

Long-term exposure to elevated radon levels increases lung cancer risk. If your water has high radon levels, it can significantly increase radon levels in your indoor air.

The EPA considers the ingestion risk minimal compared to inhalation. Your primary concern should be radon entering your home's air, especially in bathrooms during showers.

Not necessarily. Radon levels can vary dramatically even between properties just a few hundred feet apart. It depends on the specific geology your well water travels through. Each well should be tested independently.

Testing requires special sealed bottles provided by a certified laboratory. You fill the bottles with water from your tap (following specific instructions), seal them, and return them to the lab within 48 hours. Results typically come back in 5-7 business days.

What do the results mean?

Radon in water is measured in picocuries per liter (pCi/L).

• Below 4,000 pCi/L: EPA suggests no action needed if your indoor air radon is also low
• Above 4,000 pCi/L: EPA suggests considering treatment
• Above 2,000 pCi/L: Some states recommend action at this lower level

Consider testing if:

• You have a private well (not municipal water)
• Your home air radon test showed elevated levels
• You live in an area with granite or uranium-rich bedrock
• You're buying a home with well water
• You've never tested and want peace of mind