What EPA's radon map says about Pocahontas County

EPA places Pocahontas County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Rank it against the rest of the country and Pocahontas County lands in the 73rd percentile for radon potential.

Where Pocahontas County sits nationally

About 7,006 people live in Pocahontas County, Iowa, spread over 577.241 square miles. That works out to roughly 12 people per square mile. Among counties sharing Pocahontas County's EPA zone, it outranks 20% of them by population. Geologically, Pocahontas County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

What this actually means for a house in Pocahontas County

Pocahontas County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. That doesn't mean every Pocahontas County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

Testing and mitigation in Pocahontas County

Mitigation cost doesn't depend on Pocahontas County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Iowa's state radon program

Pocahontas County's test kit answers today; a Airthings radon monitor keeps answering for Pocahontas County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

More on how this number was built

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.