What EPA's radon map says about Lorain County

EPA's own radon map rates Lorain County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally, Lorain County ranks higher in radon potential than 64% of rated counties (the 64th percentile).

Lorain County by the numbers

About 322,030 people live in Lorain County, Ohio, spread over 490.536 square miles. That works out to roughly 656 people per square mile. Among counties sharing Lorain County's EPA zone, it outranks 93% of them by population. Lorain County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Lorain 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). Lorain County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Testing and mitigation in Lorain County

Mitigation cost doesn't depend on Lorain 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 Ohio's state radon program

Lorain County's test kit answers today; a Airthings radon monitor keeps answering for Lorain County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 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. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.