What EPA's radon map says about Ashland County

EPA's own radon map rates Ashland County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. That puts Ashland County in the 90th percentile nationally for radon potential — higher than 90% of the counties EPA has rated.

Ashland County by the numbers

About 52,420 people live in Ashland County, Ohio, spread over 422.986 square miles. Population density there runs about 124 people per square mile. Among counties sharing Ashland County's EPA zone, it outranks 72% of them by population. EPA's geology-based Region 5 groups Ashland County with 523 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Ashland 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. Some Ashland County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

Testing and mitigation in Ashland County

Mitigation cost doesn't depend on Ashland 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

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

Ashland County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Ashland County carries, the zone explainer covers what it does and doesn't tell you about any one house.