Radon in ZIP code 99901
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ZIP 99901 crosses 2 county lines. Most of its land (86.5%) is in Ketchikan Gateway Borough, Alaska. EPA’s radon zone for this area: Zone 2, moderate potential.
Predicted average indoor screening level from 2 to 4 pCi/L.
Predicted average indoor screening level below 2 pCi/L. Zone inherited from Prince of Wales-Outer Ketchikan Census Area.
What this means for homes in 99901
EPA built its zone map county by county in 1993, so every address in each part of 99901 shares its county’s prediction. The zone is a starting point, not a measurement of your house. In a Zone 2 area many homes are fine and many are not; only a test tells you which yours is.
Because 99901 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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Alaska radon help
AK Department of Environmental Conservation Division of Air Quality (907-465-5100) can help with test kits, local data and credentialed professionals: dggs.alaska.gov/hazards/radon.html.
Frequently asked questions
What is the radon zone for ZIP code 99901?
ZIP 99901 spans 2 counties. The highest-potential zone among them is Zone 2 (moderate potential). Ketchikan Gateway Borough: Zone 2 (86.5% of the ZIP's land); Prince of Wales-Hyder Census Area: Zone 3 (13.5% of the ZIP's land).
Should I test for radon in 99901?
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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