What EPA's radon map says about Santa Fe County

EPA places Santa Fe County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Rank it against the rest of the country and Santa Fe County lands in the 96th percentile for radon potential.

How Santa Fe County compares

About 157,765 people live in Santa Fe County, New Mexico, spread over 1,910.38 square miles. That works out to roughly 83 people per square mile. Among counties sharing Santa Fe County's EPA zone, it outranks 88% of them by population. Geologically, Santa Fe County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

What this actually means for a house in Santa Fe County

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Santa Fe County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. Being in Zone 1 raises the odds Santa Fe 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.

If Santa Fe County tests above the action level

Mitigation cost doesn't depend on Santa Fe 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

Santa Fe County's test kit answers today; a Airthings radon monitor keeps answering for Santa Fe 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. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.