Radon in Water Testing & Treatment in Champaign, IL

How Well Water Radon Reaches You

Radon dissolved in well water becomes airborne mostly through agitation, showers, running the washing machine, and running the dishwasher all release dissolved radon gas into the air as the water splashes and aerates. That released gas then adds to whatever radon is already entering the house through the foundation, which is why homes on well water with elevated water-radon readings sometimes show higher indoor air radon than the soil-gas pathway alone would explain.

There is also a direct ingestion pathway, since radon in drinking water carries its own, separate risk profile from inhaled radon, primarily associated with internal organ exposure rather than lung tissue. Both pathways matter, and testing water radon separately from air radon is the only way to know whether your well is contributing meaningfully to either one.

Who Should Test Water for Radon in This Area

If your home is on municipal water service through the city of Champaign or Urbana, water-source radon is not a meaningful concern, since municipal treatment and the nature of surface or blended water sources keep radon levels very low compared to groundwater. Water radon testing is really a question for homes on private wells, which describes a meaningful share of rural properties throughout Champaign County outside the incorporated water service areas, including many homes around smaller towns in the surrounding area.

If you are on a private well and your indoor air radon test comes back elevated, testing the water is a reasonable next step to understand whether the well is a contributing factor, since a home with both an elevated soil-gas source and an elevated water source needs both addressed to get the full benefit of mitigation. If your indoor air radon is already low despite an elevated well test, water treatment can still be worth doing given the separate ingestion exposure pathway.

Aeration Systems

Aeration is generally considered the most effective treatment method for radon in water. The system works by introducing air into the water, typically in a tank, which causes dissolved radon gas to transfer out of the water and into the air stream, which is then vented safely outside, similar in principle to how a soil-gas mitigation fan vents radon from beneath a slab. Properly designed aeration systems can achieve very high removal rates, often well above 90 percent, making them the preferred option when water radon levels are significantly elevated.

The tradeoff with aeration is complexity and footprint. These systems require a holding tank, a blower or air pump, and a vent to the outside, which means more mechanical equipment and more space than a simpler filtration setup, along with periodic maintenance to keep the system operating at its rated efficiency.

Granular Activated Carbon (GAC) Filtration

GAC filtration works differently: water passes through a tank of activated carbon media that adsorbs radon as it flows through, capturing it in the filter media itself rather than venting it to outside air. GAC systems are generally simpler and more compact than aeration systems and can be an effective, lower-complexity option, particularly for moderate water radon levels.

The honest tradeoff with GAC is that the filter media accumulates radioactivity over time as it captures radon and its decay products, which means the spent media requires careful handling and disposal rather than routine trash disposal, and the tank itself can become a low-level radioactive source that needs to be sited and eventually replaced with that in mind. We walk homeowners through this tradeoff plainly rather than downplaying it, since it is a real factor in choosing between GAC and aeration for a given well.

Air and Water Mitigation Are Separate Projects

It is worth being clear that treating water radon does not address soil-gas radon entering through your foundation, and treating soil-gas radon with a sub-slab or crawlspace system does not address radon dissolved in your well water. They are two independent pathways with two independent fixes, and a home on a private well with both an elevated air reading and an elevated water reading needs both a mitigation system and a water treatment system to fully address the exposure.

That said, the two projects are often worth coordinating together rather than tackled entirely separately, since scheduling, cost planning, and understanding the full picture of your home's radon exposure benefit from seeing both results side by side. We are glad to test both air and water in the same visit for well-water homes so you get a complete picture rather than piecing it together from separate appointments, and knowing both numbers up front helps prioritize which system, if either, is worth addressing first, and helps avoid paying for a fix aimed at the wrong pathway.

Frequently Asked Questions