Carter County, OK radon potential

Carter County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally that's the 22nd percentile for radon potential — Carter County outranks 22% of every county EPA has rated.

How Carter County compares

Carter County, Oklahoma is home to about 49,135 people across 822.301 square miles. Averaged across its land area, Carter County runs about 60 people per square mile. Within its own EPA zone, Carter County is bigger by population than 66% of the counties that share it. EPA's geology-based Region 6 groups Carter County with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Carter County's Zone 3 prediction is the low end of the scale. A Zone 3 rating means Carter County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

If Carter 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 Oklahoma's state radon program

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.