What EPA's radon map says about Colfax County

EPA's own radon map rates Colfax County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Colfax County sits at the 77th percentile nationally for radon potential — above 77 of every 100 rated counties.

Colfax County by the numbers

About 12,307 people live in Colfax County, New Mexico, spread over 3,757.976 square miles. Averaged across its land area, Colfax County runs about 3 people per square mile. Among counties sharing Colfax County's EPA zone, it outranks 33% of them by population. EPA's geology-based Region 6 groups Colfax County with 502 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Colfax County's predicted average sits above EPA's own action level of 4 pCi/L — the concentration at which EPA recommends fixing a home — versus a national average around 1.3 pCi/L indoors and 0.4 pCi/L outdoors. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Colfax County will test well under the action level, and EPA's guidance is to test regardless of zone.

Testing and mitigation in Colfax County

Mitigation cost doesn't depend on Colfax 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 New Mexico's state radon program

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.