Radon in ZIP code 21539
Last updated
ZIP 21539 crosses 2 county lines. Most of its land (57.4%) is in Garrett County, Maryland. 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 from 2 to 4 pCi/L.
What this means for homes in 21539
EPA built its zone map county by county in 1993, so every address in each part of 21539 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 21539 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 Garrett County
Maryland radon help
The Maryland radon program (410-537-3193) can help with test kits, local data and credentialed professionals: health.maryland.gov/phpa/OEHFP/EH/pages/radon.aspx.
Frequently asked questions
What is the radon zone for ZIP code 21539?
ZIP 21539 spans 2 counties. The highest-potential zone among them is Zone 2 (moderate potential). Garrett County: Zone 2 (57.4% of the ZIP's land); Allegany County: Zone 2 (42.6% of the ZIP's land).
Should I test for radon in 21539?
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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