Is Licking County, OH a radon risk area?

Licking County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Licking County sits at the 97th percentile nationally for radon potential — above 97 of every 100 rated counties.

Licking County by the numbers

About 184,898 people live in Licking County, Ohio, spread over 682.43 square miles. That works out to roughly 271 people per square mile. Rank 104 by population within its EPA zone puts Licking County at the 90th percentile among zone peers. EPA's geology-based Region 5 groups Licking County with 523 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Licking 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. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Licking County will test well under the action level, and EPA's guidance is to test regardless of zone.

Testing and mitigation in Licking County

Nothing about Licking County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Ohio's state radon program

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

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