Colorado radon directory
Radon Professionals in Colorado
Counties on the map are shaded by EPA radon zone and every dot is a town with its own page. Select a county to see everything inside it, or a dot to go straight to the town.
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Radon In Colorado
Radon levels vary by geology, not by city limits, so two houses on the same street can read differently. The only way to know a home’s level is to test it. The map shows EPA radon zones across Colorado, which predict what is likely rather than what any individual house will measure.
Of the 63 counties in Colorado on this map, 51 are in EPA Zone 1, the highest of the three predicted levels.
- Zone 1, highest
- 51
- Zone 2, moderate
- 12
Zones predict what is likely across a county. They say nothing about one house, and homes in every zone test high.
Colorado runs its own radon program, and it is worth a call before you spend anything: several states hand out discounted or free test kits, and the office can tell you what the rules are where you live.
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