Do New Waukee Homes Have Radon Problems? (Yes - Here's Why)

If you just bought or built a home in Waukee, radon probably wasn’t on your punch list. New house, new foundation, modern code - it feels like an old-house problem. It isn’t. New construction in central Iowa tests above the EPA action level all the time, and in some ways new homes are more prone to elevated radon, not less.

Why new homes test high

Radon comes from the soil, not the house. Waukee sits on the glacial deposits that make Iowa the highest-radon state in the country, and Dallas County is rated Zone 1 by the EPA - the highest-risk category there is. Every home here, whatever its age, sits on the same ground.

New construction adds two wrinkles:

• Tighter envelopes. Modern homes are sealed for energy efficiency. Less air leakage means less dilution - soil gas that gets in, stays in.
• Fresh soil disturbance. Excavation and backfill open up new pathways for soil gas that can take years to settle.

”But my builder installed a radon system”

Probably a passive rough-in: a pipe running from under the slab through the roof, with no fan. Iowa doesn’t require builders to activate it or to verify it works. A passive stack helps, but plenty of homes with one still test above 4 pCi/L. The pipe in your utility room is a head start, not an answer - and the only way to know is a test.

The good news: if a passive-rough-in home does test high, activating the system (adding a fan) is usually the cheapest mitigation scenario there is.

What to do

1. Test. Every level of contact with the soil, ideally in the heating season. A short-term test runs about 48 hours.
2. If it’s 4 pCi/L or higher, mitigate. For most newer Waukee homes that’s a one-day job, often just activating the existing rough-in.
3. Retest after. A post-mitigation test confirms the number actually came down.

If you’re under a purchase deadline, testing can be scheduled around your closing date - radon results are one of the most common late surprises in central Iowa transactions, and they’re fixable without blowing up the timeline.