What EPA's radon map says about Clear Creek County

EPA's own radon map rates Clear Creek County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Rank it against the rest of the country and Clear Creek County lands in the 75th percentile for radon potential.

Where Clear Creek County sits nationally

About 9,076 people live in Clear Creek County, Colorado, spread over 395.073 square miles. Population density there runs about 23 people per square mile. Among counties sharing Clear Creek County's EPA zone, it outranks 25% of them by population. EPA's geology-based Region 8 groups Clear Creek County with 290 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Clear Creek County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Clear Creek County specifically.

Testing and mitigation in Clear Creek County

Mitigation cost doesn't depend on Clear Creek County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Colorado's state radon program

Clear Creek County's test kit answers today; a Airthings radon monitor keeps answering for Clear Creek County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

More on how this number was built

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Clear Creek County carries, the zone explainer covers what it does and doesn't tell you about any one house.