What EPA's radon map says about Keokuk County

EPA's own radon map rates Keokuk County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. That puts Keokuk County in the 76th percentile nationally for radon potential — higher than 76% of the counties EPA has rated.

Keokuk County by the numbers

About 9,855 people live in Keokuk County, Iowa, spread over 579.175 square miles. That works out to roughly 17 people per square mile. Among counties sharing Keokuk County's EPA zone, it outranks 28% of them by population. Geologically, Keokuk County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Where the national indoor average runs about 1.3 pCi/L, Keokuk County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. Being in Zone 1 raises the odds Keokuk County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

Next steps for a home in Keokuk County

Mitigation cost doesn't depend on Keokuk 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

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

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Keokuk County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.