Radon in Water Treatment in Maine

Protect your family from waterborne radon with professional aeration systems for Maine homes with well water.

Happy family in their Maine home with clean, radon-free water — Keep your family safe with clean water

Radon in Well Water: An Invisible Threat

Many Maine homes rely on private wells for their water supply. While well water has many benefits, it can also contain dissolved radon gas. When this water is used for showering, cooking, or other household activities, radon is released into the air you breathe.

The EPA estimates that waterborne radon contributes to approximately 180 cancer deaths annually in the United States. Maine's geology, rich in granite and other uranium-bearing rocks, makes waterborne radon a particular concern for homeowners with wells.

How Radon Enters Your Water

Radon dissolves into groundwater as it flows through underground rock and soil containing uranium. When this water is drawn up through your well, it carries the dissolved radon into your home. The radon is then released into the air when water is used, particularly during:

Showering and bathing
Running dishwashers and washing machines
Flushing toilets
Any activity that agitates water

Our Water Treatment Solutions

At Central Maine Radon & Water Mitigation, we specialize in aeration systems that effectively remove radon from your water supply. Our treatment methods include:

Water Testing

We test your well water to determine radon levels and assess the best treatment approach for your home.

System Selection

Based on your water usage and radon levels, we recommend the most effective aeration or treatment system.

Professional Installation

Our technicians install the treatment system, typically where water enters your home, ensuring comprehensive protection.

Verification Testing

Post-installation water testing confirms radon has been reduced to safe levels throughout your home.

Aeration Systems: How They Work

Aeration systems are the most effective method for removing radon from water. They work by:

Spraying water in a chamber to release dissolved radon gas
Venting the released radon safely outside your home
Removing up to 99% of radon from your water supply
Maintaining your water quality and pressure

When Should You Test?

We recommend testing your well water for radon if:

You've never tested your well water for radon
Your home is located in an area with known high radon levels
You've recently bought a home with a private well
You have a radon mitigation system for air but haven't addressed water

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Concerned About Radon in Your Water?

Don't let waterborne radon put your family at risk. Contact us today for professional water testing and treatment solutions.

Call Now: (207) 483-5637

Radon Education & Resources

Radon in Water vs Air

Two different radon sources, two different fixes — understand the difference.

Is Radon Dangerous?

Learn the health risks of radon exposure and why Maine has above-average levels.

What Radon Level Is Dangerous?

Understand EPA action levels and what your test result means for your family's health.

How to Lower Radon Levels

Every effective radon reduction method explained — from air mitigation to water treatment.

Cost of Radon Mitigation in Maine

Typical pricing, what affects cost, and what's included in a professional installation.

Radon Risk Calculator

Enter your radon test result to understand your risk in plain language.

Frequently Asked Questions About Radon in Water

Who is at risk for radon in well water?

Only homes on private well water are at risk — municipal (town) water is treated and virtually radon-free by the time it reaches your tap. If your home uses a drilled or dug well, especially in central or western Maine where granite bedrock is common, radon in water is worth testing for.

How does radon in well water get into the air?

When you run a shower, dishwasher, or washing machine, dissolved radon gas releases from the water into the indoor air — a process called off-gassing. Showers are the biggest contributor since they agitate the water and the bathroom is a confined space. The EPA estimates that roughly 1 pCi/L of radon in air comes from every 10,000 pCi/L of radon in water.

How is radon in water treated?

The most effective treatment is a point-of-entry aeration system, which forces radon out of the water before it enters your home's plumbing. Granular activated carbon (GAC) filters are another option for lower levels. We assess your situation and recommend the right treatment method for your home and water test results.

Should I test for radon in water if I've already mitigated my air?

Yes — air and water radon are separate problems with separate fixes. A sub-slab depressurization system addresses radon entering through your foundation, but it does nothing for radon that enters through your water supply. If you're on a well, it's worth testing the water independently.

What radon level in water requires treatment?

The EPA has proposed a Maximum Contaminant Level (MCL) of 300 pCi/L for radon in public water supplies, and an Alternative MCL of 4,000 pCi/L for states with radon-in-air programs. For private wells, treatment is generally recommended above 4,000 pCi/L, though many experts suggest acting at lower levels — especially if your household includes children or you spend significant time in areas where water is used heavily.