Poweshiek County
Poweshiek County is classified by the EPA’s 1993 Map of Radon Zones as Zone 1, the highest risk category. The predicted average indoor radon screening level for this area exceeds 4 pCi/L — the EPA's recommended action level. This classification is based on geology, soil characteristics, indoor radon measurements, and building construction factors. The EPA strongly recommends that all homes in Zone 1 areas be tested for radon.
Poweshiek County is one of 99 counties in Iowa classified as Zone 1, the EPA's highest radon risk category. That means 100% of the state's 99 counties share this classification. Homes in Poweshiek County have predicted average indoor radon screening levels above 4 pCi/L, the EPA's recommended action level for mitigation. If you're living in, buying, or building a home in Poweshiek County, radon testing should be a priority.
Test for radon in Poweshiek County
EPA Zone 1 means predicted indoor levels above 4 pCi/L. The EPA recommends every Zone 1 home test — and mitigate if results confirm elevated levels.
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What This Means for Poweshiek County
Should You Test?
Yes. The EPA strongly recommends testing in Zone 1 areas. Homes here have the highest probability of exceeding the 4 pCi/L action level. Start with a short-term test kit ($15–$30 at hardware stores or online). If results are above 4 pCi/L, follow up with a second test or hire a certified professional.
Real Estate
If you're buying a home in this area, request a radon test as part of the inspection process. Many states require or encourage radon disclosure during real estate transactions. In Zone 1 areas, professional radon testing with a continuous monitor is common practice. If levels are above 4 pCi/L, you can negotiate mitigation as a condition of sale. A mitigation system typically costs $800–$2,500.
New Construction
The EPA recommends that new homes in Zone 1 be built with radon-resistant features (RRNC). These include a gas-permeable layer beneath the slab, plastic sheeting, sealed foundation cracks, a vent pipe from the gravel layer to the roof, and an electrical junction box for a future fan. Adding these during construction costs $350–$500 and is far cheaper than retrofitting later.