Radon in ZIP code 74643
Last updated
ZIP 74643 crosses 2 county lines. Most of its land (93.1%) is in Grant County, Oklahoma. EPA’s radon zone for this area: Zone 3, low potential.
Predicted average indoor screening level below 2 pCi/L.
Predicted average indoor screening level below 2 pCi/L.
What this means for homes in 74643
EPA built its zone map county by county in 1993, so every address in each part of 74643 shares its county’s prediction. The zone is a starting point, not a measurement of your house. A Zone 3 prediction is the lowest, but EPA still finds homes above the action level in these areas.
Because 74643 crosses county lines, your county depends on your street. Your property tax bill or county assessor site shows which county you are in. Next: read how to test your home, then check the number with the level calculator.
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Nearby ZIP codes in Grant County
Oklahoma radon help
OK Department of Environmental Quality, Land Protection Division, Radiation Management Section (405-702-5100) can help with test kits, local data and credentialed professionals: oklahoma.gov/deq/divisions/land-protection/radiation/radon.html.
Frequently asked questions
What is the radon zone for ZIP code 74643?
ZIP 74643 spans 2 counties. The highest-potential zone among them is Zone 3 (low potential). Grant County: Zone 3 (93.1% of the ZIP's land); Kay County: Zone 3 (6.9% of the ZIP's land).
Should I test for radon in 74643?
Yes. EPA recommends testing every home regardless of zone, because radon varies from house to house. Fix the home if a confirmed result is 4 pCi/L or higher, and consider fixing between 2 and 4 pCi/L.
Free checklist · PDF
Radon Test Checklist
A one-page, step-by-step checklist for running a home radon test right the first time, and what to do with the number.
- Short-term vs. long-term test: which to use
- Closed-house conditions and where to place the kit
- What 2, 4 and 8 pCi/L mean and when to fix
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