Des Moines sits at the heart of Iowa's most concentrated radon exposure zone. Polk County's combination of glacial-till soils, fractured limestone bedrock, and basement-heavy housing stock creates ideal conditions for radon accumulation. The county averages 9.2 pCi/L — more than double the EPA action level of 4 pCi/L. Most Des Moines homes with full basements should be tested every 2 years and after any major foundation work.
Geology: Cold winters drive negative pressure in basements (stack effect), pulling radon-laden soil gas indoors. Iowa winter radon levels typically test 30-50% higher than summer measurements.
Permits: Iowa does not require a permit for radon mitigation system installation on existing single-family homes. Polk County recommends post-mitigation verification testing within 30 days of system activation.
Neighborhoods we serve in Des Moines: Beaverdale, Sherman Hill, South of Grand, East Des Moines, Drake, Highland Park, Waveland Park.
All Des Moines radon work is performed by NRPP-certified, IDPH-registered partner contractors routed through Iowa Radon Experts.
Polk County averages 9.2 pCi/L indoor radon — well above the EPA action level of 4 pCi/L. Here's how Des Moines's radon profile compares to other Iowa cities we serve.
| Metric | Des Moines, IA | Iowa State Average | US National Average |
|---|---|---|---|
| Average indoor radon | 9.2 pCi/L | 8.5 pCi/L | 1.3 pCi/L |
| EPA Radon Zone | Zone 1 | Zone 1 (majority) | Varies (Zones 1–3) |
| % homes elevated (>4 pCi/L) | 71% | ~71% (5 in 7) | ~6% |
| Multiple of EPA action level | 2.3x | 2.1x | 0.3x |
| EPA action level | 4.0 pCi/L | 4.0 pCi/L | 4.0 pCi/L |
Active radon mitigation system installation for Iowa homes — sub-slab depressurization is the most common method, reducing indoor …
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Professional radon testing services for Iowa homes — short-term (2-7 day) and long-term (90+ day) testing options. Required for mo…
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Iowa's most common radon mitigation method — sub-slab depressurization (ASD) creates negative pressure beneath the basement slab, …
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Sub-membrane depressurization for Iowa homes with crawl spaces — includes vapor barrier installation, sealing, and active depressu…
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Radon mitigation integrated with existing sump pump systems — uses the existing sump pit as an active depressurization point with …
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Independent verification testing after radon mitigation system installation — confirms that the installed system has reduced indoo…
Learn more →Iowa Code requires sellers to disclose any known radon test results to buyers. In practice, most Des Moines real estate transactions now include a radon contingency in the purchase agreement — and given that 71% of Des Moines homes test elevated, buyers are increasingly insisting on pre-closing mitigation when results exceed 4 pCi/L.
Our partner contractor network handles closing-timeline mitigations within typical 7–14 day windows, including post-mitigation verification testing to satisfy lender and inspector requirements.
Yes. Des Moines's cold winters intensify radon entry through the stack effect — heated indoor air rising creates negative pressure in basements that pulls soil gas into the home at higher rates than warmer climates. Des Moines winter radon readings are typically 30–50% higher than summer readings.
EPA recommends radon testing under closed-house conditions, which align naturally with Des Moines winters. If your Des Moines home tested low in summer, retest in winter for an accurate baseline before deciding on mitigation.
Recent radon mitigation projects across Iowa — every image is geo-tagged to a specific Iowa city and entity-described for transparency and provenance. All work performed by NRPP-certified, IDPH-registered partner contractors.
📍 Des Moines, Iowa 
📍 West Des Moines, Iowa Reviews shown with structured detail per our coached-review program — partner contractor, service type, Iowa city, and pre/post radon reduction data are documented for transparency. Placeholders shown pre-launch; real Iowa homeowner reviews will populate this section after the first partner installs complete.
"[Placeholder pre-launch. After first partner installs, this slot will populate with a real coached review including specific pCi/L reduction numbers, the certified partner contractor's name, the Iowa city, and a 1-2 sentence customer experience description. Example format: 'Pre-mitigation reading was 12.1 pCi/L. Post-mitigation came back at 1.4 — 88% reduction. Our partner contractor was punctual, professional, and explained every step.']"
"[Placeholder for coached review from Cedar Rapids partner install. Will include named NRPP-certified partner contractor, real pCi/L reduction data, and customer experience detail. Replace after first 5 partner-completed projects.]"
"[Placeholder for coached review from Iowa City real estate transaction radon mitigation. Will highlight closing-timeline turnaround, partner contractor name, and pre/post radon test results. Replace after first transaction-driven install.]"
Polk and Dallas Counties · 8.8 pCi/L avg
Polk County · 9.2 pCi/L avg
Linn County · 7.9 pCi/L avg
Johnson County · 7.4 pCi/L avg
Scott County · 6.8 pCi/L avg
Story County · 8.6 pCi/L avg
Black Hawk County · 8.2 pCi/L avg
Black Hawk County · 8.2 pCi/L avg
Same-day routing to a Polk County NRPP-certified partner. Written quote within 48 hours of site assessment.