Lucas County, OH: EPA's radon zone, explained

EPA places Lucas County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally that's the 64th percentile for radon potential — Lucas County outranks 64% of every county EPA has rated.

Where Lucas County sits nationally

Lucas County, Ohio is home to about 426,291 people across 339.668 square miles. That works out to roughly 1,255 people per square mile. By population, Lucas County is the 61st largest of every county sharing its EPA zone — the 94th percentile by population within that zone. EPA's geology-based Region 5 groups Lucas County with 523 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Lucas County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Nothing about a Zone 2 label lowers the case for testing in Lucas County — EPA recommends it in every zone, moderate included.

Testing and mitigation in Lucas County

For a Lucas County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Ohio's state radon program

For Lucas County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Lucas County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

Where Lucas County's figures come from

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