What EPA's radon map says about Huerfano County

EPA places Huerfano 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. Nationally that's the 73rd percentile for radon potential — Huerfano County outranks 73% of every county EPA has rated.

Where Huerfano County sits nationally

About 6,988 people live in Huerfano County, Colorado, spread over 1,591.033 square miles. Averaged across its land area, Huerfano County runs about 4 people per square mile. Among counties sharing Huerfano County's EPA zone, it outranks 20% of them by population. Geologically, Huerfano County is grouped into EPA Region 8 alongside 290 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Huerfano 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. 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 Huerfano County will test well under the action level, and EPA's guidance is to test regardless of zone.

Next steps for a home in Huerfano County

Mitigation cost doesn't depend on Huerfano 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

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

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Huerfano County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.