Radon in Well Water for Spokane and North Idaho Homes
If your property draws water from a private well, radon can enter your home through your water supply, not just through the soil beneath your foundation. Here's how that concern differs from airborne radon.
Airborne Radon vs. Waterborne Radon
This page covers a different, separate concern from the airborne soil-gas radon covered throughout the rest of this site. Airborne radon seeps through a foundation from surrounding soil gas; waterborne radon comes from a private well drawing water from radon-bearing rock, most often granite, and gets released into indoor air when water runs, especially during showers and dishwashing. The two require different tests and different fixes: an airborne test kit measures air, not water, so it tells you nothing about a water-source problem. If your property is on a private well rather than municipal water, that's the first sign this page, not the rest of the site, is the relevant one.
How to Test Well Water for Radon
A standard radon test kit, the charcoal or electret canister used throughout this site, measures air, not water. Testing well water for radon requires a specific water sample, collected and sent to a certified water-testing lab, not the kits used for standard indoor air testing. Ask a lab specifically for a radon-in-water test, since a general water-quality panel doesn't automatically include it. If you're on a private well and haven't tested your water for radon separately from your home's air, it's a genuinely distinct test worth asking about, not something a standard air test already covers.
How Radon Is Removed From Well Water
Two methods handle waterborne radon: aeration, which sprays or bubbles air through the water to release radon gas before it reaches your taps, and granular activated carbon filtration, which adsorbs radon as water passes through the filter media. Aeration is generally preferred for higher radon levels, since it physically removes the gas rather than just capturing it, while carbon systems can accumulate radioactivity in the filter media over time at high concentrations. A water treatment professional can test your specific well and recommend which approach fits your situation and water chemistry.
Should You Worry About It in the Spokane Area
It's worth checking if your home is on a private well, particularly on granite-influenced ground in North Idaho or rural Spokane County, since well water radon is a separate risk from the airborne radon this site otherwise covers. It's a smaller and less studied concern nationally than airborne radon, but a real one worth ruling out rather than assuming away. See our service area page for coverage across rural, well-owning properties, or the cost guide for airborne radon pricing context.
Ask about water and air testing together
Call directly, or send a request and a qualified local pro will follow up.
Well Water Radon Questions, Answered Straight
Is radon in well water the same as radon in the air?
No. Airborne radon, covered throughout the rest of this site, comes from soil gas seeping through a foundation. Waterborne radon comes from a private well drawing water from radon-bearing rock, most often granite, and is released into indoor air when water runs, especially during showers. The two require different tests and different fixes.
How do I test well water for radon?
Airborne radon test kits measure air, not water, so they won't catch a water-source problem. Testing well water for radon requires a specific water sample collected and analyzed by a certified water-testing lab, not the charcoal canisters used for standard indoor air radon testing. Ask a lab specifically for a radon-in-water test.
How is radon removed from well water?
The two common methods are aeration, which sprays or bubbles air through the water to release radon gas before it reaches your taps, and granular activated carbon filtration, which adsorbs radon as water passes through. Aeration is generally preferred for higher radon levels; a water treatment professional can recommend which fits your well.
Should I worry about well water radon in the Spokane area?
It's worth checking if your home is on a private well, particularly on granite-influenced ground in North Idaho or rural Spokane County, since well water radon is a separate risk from the airborne radon this site otherwise covers. It's a smaller and less studied concern nationally than airborne radon, but a real one worth ruling out.
See coverage for well-owning properties
Rural Spokane County and North Idaho coverage details.