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

Coshocton County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Rank it against the rest of the country and Coshocton County lands in the 87th percentile for radon potential.

Coshocton County by the numbers

Coshocton County, Ohio is home to about 37,003 people across 563.911 square miles. Population density there runs about 66 people per square mile. By population, Coshocton County is the 405th largest of every county sharing its EPA zone — the 62nd percentile by population within that zone. EPA's geology-based Region 5 groups Coshocton County with 523 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Coshocton 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 Coshocton County will test well under the action level, and EPA's guidance is to test regardless of zone.

If Coshocton County tests above the action level

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

Where Coshocton County's figures come from

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