Garvin County, OK: EPA's radon zone, explained

Garvin County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Rank it against the rest of the country and Garvin County lands in the 16th percentile for radon potential.

Garvin County by the numbers

Garvin County, Oklahoma is home to about 26,149 people across 802.146 square miles. Averaged across its land area, Garvin County runs about 33 people per square mile. By population, Garvin County is the 528th largest of every county sharing its EPA zone — the 49th percentile by population within that zone. Garvin County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

At Zone 3, Garvin County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Garvin County testing above the action level often enough that skipping a test isn't the safe assumption.

Next steps for a home in Garvin County

For a Garvin 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 Oklahoma's state radon program

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

Where Garvin County's figures come from

Garvin County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.