Is Montezuma County, CO a radon risk area?

Montezuma County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Nationally, Montezuma County ranks higher in radon potential than 84% of rated counties (the 84th percentile).

Where Montezuma County sits nationally

About 26,841 people live in Montezuma County, Colorado, spread over 2,029.349 square miles. That works out to roughly 13 people per square mile. Rank 494 by population within its EPA zone puts Montezuma County at the 54th percentile among zone peers. EPA's geology-based Region 8 groups Montezuma County with 290 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Montezuma County

Montezuma 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. Being in Zone 1 raises the odds Montezuma County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

Testing and mitigation in Montezuma County

Nothing about Montezuma 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

Montezuma County's test kit answers today; a Airthings radon monitor keeps answering for Montezuma 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

The methodology guide shows exactly which EPA and Census sources feed Montezuma County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.