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Radon Mitigation in Boise & the Treasure Valley

2 in 5 Idaho homes test high for radon, the leading cause of lung cancer in non-smokers. We test, install, and verify radon mitigation systems across Boise, Meridian, Eagle, Nampa, and Caldwell, usually in a single day.

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Radon in the Treasure Valley, in plain terms

Radon is a radioactive gas released by uranium breaking down in Idaho soil. You can't see it, smell it, or taste it, and it seeps into homes through crawl spaces, foundation cracks, and slab gaps. The Idaho Department of Health and Welfare reports 2 in 5 tested Idaho homes are above the EPA action level, and radon has been found in every county in the state. Mitigation for an existing home typically runs $800 to $2,500, is installed in about a day, and is verified with a follow-up test.
Radon level scale (pCi/L)
04.0 — EPA action level10+

The EPA says fix your home at 4.0 pCi/L or higher. The World Health Organization recommends acting at 2.7. A properly installed system typically brings a home under 2.0, often under 1.0, and the post-mitigation test proves it.

2 in 5
Idaho homes test above the EPA radon action level (Idaho DHW)
36%
of tested homes in some Boise zip codes come back high
1 day
typical install time for a residential mitigation system
21,000
U.S. lung cancer deaths per year attributed to radon (EPA)

What we do

Most calls start one of two ways. Either a home inspection turned up a high radon number in the middle of a sale and the clock is ticking, or a homeowner ran one of Idaho's test kits and the result came back over 4.0. Both end the same way: a mitigation system sized to your foundation, installed in about a day, and verified with a clearance test so you're not taking anyone's word for it.

Buying or selling a home? Radon is now part of the deal

Idaho has a radon disclosure requirement for real estate transactions, and radon testing has become a standard part of Treasure Valley home inspections. A failed test doesn't have to derail your closing. Mitigation can typically be installed within days of the inspection report, with a clearance test 24 to 48 hours after install, fast enough to keep most closings on schedule. Whether you're the buyer negotiating a fix or the seller keeping a deal together, see our real estate radon page for exactly how it works on a deadline.

Where we work

We serve the full Treasure Valley. Radon doesn't map to neighborhood age or price point, new builds in Meridian test high just like 1970s homes on the Boise Bench, because it comes from the geology underneath, not the house on top.

Common questions

How common is radon in the Treasure Valley?

Very. The Idaho Department of Health and Welfare reports that 2 in 5 tested Idaho homes have radon above the EPA action level of 4.0 pCi/L, and high levels have been found in every county in the state. In some Boise zip codes, 36% of tested homes come back high.

How much does radon mitigation cost in Boise?

Most existing-home systems in the Treasure Valley run $800 to $2,500 depending on your foundation type. Homes with crawl spaces that need a sealed membrane land toward the higher end. You get a firm quote before any work starts.

How fast can a system be installed?

Most residential systems go in within a single day. On a real estate deadline, the post-mitigation clearance test typically follows within 24 to 48 hours so your closing stays on schedule.

Does a radon system actually work?

Yes. A properly installed sub-slab or sub-membrane depressurization system routinely brings homes from well above 4.0 pCi/L to under 2.0, often under 1.0. Every system is verified with a post-mitigation radon test so you see the numbers yourself.

I never go in my crawl space. Does radon still matter?

Yes. Radon rises from the soil into your living space through the stack effect, the natural upward movement of air in a house. Idaho homes with crawl spaces are a primary entry path, which is why sealed crawl space membranes are a core part of mitigation here.

Is radon really dangerous?

Radon is the second leading cause of lung cancer in the United States after smoking, and the leading cause in people who have never smoked. The EPA attributes roughly 21,000 lung cancer deaths a year to it. It's invisible, odorless, and tasteless, so testing is the only way to know your number.

Get your radon number handled

Free quotes. One-day installs. Verified results across the Treasure Valley.

☎ (208) 510-0970