Crawford County, OH radon potential

EPA's own radon map rates Crawford County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Nationally that's the 88th percentile for radon potential — Crawford County outranks 88% of every county EPA has rated.

Where Crawford County sits nationally

Crawford County, Ohio is home to about 41,626 people across 401.786 square miles. That works out to roughly 104 people per square mile. Within its own EPA zone, Crawford County is bigger by population than 66% of the counties that share it. Geologically, Crawford County is grouped into EPA Region 5 alongside 523 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Crawford County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Crawford County specifically.

If Crawford County tests above the action level

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Ohio's state radon program

For Crawford County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Crawford 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 Crawford County's figures come from

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