Radon in ZIP code 81151
Last updated
ZIP 81151 crosses 2 county lines. Most of its land (56.8%) is in Costilla County, Colorado. 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 81151
EPA built its zone map county by county in 1993, so every address in each part of 81151 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 81151 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 Costilla County
Colorado radon help
CO Department of Public Health & Environment (CDPHE) (800-846-3986) can help with test kits, local data and credentialed professionals: cdphe.colorado.gov/hm/radon.
Frequently asked questions
What is the radon zone for ZIP code 81151?
ZIP 81151 spans 2 counties. The highest-potential zone among them is Zone 2 (moderate potential). Costilla County: Zone 2 (56.8% of the ZIP's land); Conejos County: Zone 2 (43.2% of the ZIP's land).
Should I test for radon in 81151?
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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