Radon in Water Testing & Treatment in Peoria, IL

Why This Mostly Matters for Well Water

Radon dissolves into groundwater the same way it forms in soil, through the natural decay of uranium in rock and sediment. Water drawn from a private well comes straight from that groundwater with essentially no time for dissolved gas to escape before it reaches your plumbing. Municipal water systems, by contrast, typically involve treatment processes and holding time in transit that allow much of the dissolved radon to dissipate into the atmosphere before the water ever reaches a customer's tap, which is why radon in water is overwhelmingly a private well concern rather than a municipal supply issue.

If your home in the Peoria area is on a private well, radon in water is worth testing for as its own separate question from your soil gas radon test. A home can have completely normal air radon levels from soil gas and still have elevated radon in its well water, or the reverse, so one test does not substitute for the other.

Water testing for radon uses a different method than air testing. A water sample is collected directly from the tap, typically from a source close to where the well line enters the house before any softening or other treatment, and sent to a lab for analysis rather than left in place for days like an air test. Results come back in picocuries per liter of water, and while there is no single federal enforceable limit for radon in private well water the way there is for air, elevated readings are still worth addressing given how directly they can affect both indoor air and drinking water exposure.

How Radon Gets From Water Into Your Air, and Into You

Radon dissolved in water releases into the air whenever that water is agitated or heated, which happens constantly in a normal household: showers, dishwashers, washing machines, even running a faucet. In homes where well water carries meaningfully elevated radon, this can be a real contributor to overall indoor air radon levels on top of whatever is coming up from the soil beneath the foundation. This is one reason a home can pass a soil gas mitigation system's retest and still have somewhat elevated air readings if the water source was never addressed.

The second exposure pathway is direct ingestion, drinking the water itself, which is a separate health question from inhaled radon and is evaluated differently. Testing your well water tells you where you actually stand on both fronts rather than guessing based on your air test results alone.

Aeration and Carbon Filtration: The Two Treatment Options

Aeration systems are generally the more effective treatment method. They work by mechanically agitating or spraying incoming water to release dissolved radon gas, then venting that gas outside the home, similar in principle to how a soil gas mitigation system vents radon from beneath your foundation. Because aeration physically removes the radon from the water rather than trapping it, it addresses both the airborne release problem and the ingestion exposure at the same time, and it does not accumulate radioactivity in the equipment over time.

Granular activated carbon, or GAC, filtration is the other common option. It is effective at reducing radon in water and is often a lower upfront cost than an aeration system, but it works by adsorbing radon onto the carbon media rather than venting it away, which means the filter itself can accumulate radioactivity over time as it captures more radon. That accumulation needs to be accounted for with proper filter change intervals and careful disposal of spent media, which is a real maintenance consideration that aeration systems generally avoid.

• •Aeration vents dissolved radon outside, addressing air and water exposure
• •GAC filtration is effective but requires careful media disposal
• •Testing well water is separate from testing your home's air
• •Treatment sized to your well's flow rate and radon concentration

Choosing the Right Option and Fitting It With Whole-Home Mitigation

Choosing between aeration and GAC filtration comes down to your specific water radon level, your household's water usage, budget, and how much ongoing maintenance you want to take on. Higher concentrations generally favor aeration, since it removes radon rather than just capturing it, and it avoids the disposal considerations that come with a saturated carbon filter. Lower concentrations may be adequately addressed with a properly sized GAC system at a lower upfront cost, as long as filter change intervals are respected.

If your home also has an elevated soil gas radon reading, water treatment and a sub-slab or crawlspace mitigation system address two genuinely separate entry pathways, and both may be needed for a full solution. We evaluate both together when a well water home shows elevated air readings, rather than assuming one system will fix both problems, since it usually will not.

Maintenance looks different between the two options as well. Aeration systems generally need periodic checks of the fan or pump that drives the agitation process and occasional cleaning of the treatment chamber, while GAC systems need media replacement on a schedule tied to your household's water usage and the radon concentration in your source water. Neither option is install-and-forget forever, and we walk through the expected maintenance for whichever system fits your situation before installation, not after.

Frequently Asked Questions