Is Routt County, CO a radon risk area?

EPA's own radon map rates Routt County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Rank it against the rest of the country and Routt County lands in the 48th percentile for radon potential.

Routt County by the numbers

About 25,243 people live in Routt County, Colorado, spread over 2,362.02 square miles. Population density there runs about 11 people per square mile. Rank 549 by population within its EPA zone puts Routt County at the 47th percentile among zone peers. EPA's geology-based Region 8 groups Routt County with 290 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Routt County

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Routt County's Zone 2 prediction lands in the gap between the two. Middle-of-the-pack doesn't mean risk-free for any one Routt County address — a moderate county average still leaves individual homes to test either side of it.

Testing and mitigation in Routt County

Nothing about Routt County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Colorado's state radon program

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

More on how this number was built

Routt County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.