What EPA's radon map says about Lucas County

Lucas County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Nationally, Lucas County ranks higher in radon potential than 74% of rated counties (the 74th percentile).

Lucas County by the numbers

About 8,758 people live in Lucas County, Iowa, spread over 430.681 square miles. That works out to roughly 20 people per square mile. Among counties sharing Lucas County's EPA zone, it outranks 25% of them by population. EPA's geology-based Region 7 groups Lucas County with 411 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Where the national indoor average runs about 1.3 pCi/L, Lucas County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. That doesn't mean every Lucas 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.

Next steps for a home in Lucas County

Mitigation cost doesn't depend on Lucas 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

Lucas County's test kit answers today; a Airthings radon monitor keeps answering for Lucas 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

The methodology guide shows exactly which EPA and Census sources feed Lucas County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.