What EPA's radon map says about Alamosa County

Alamosa County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Nationally that's the 44th percentile for radon potential — Alamosa County outranks 44% of every county EPA has rated.

How Alamosa County compares

About 16,689 people live in Alamosa County, Colorado, spread over 722.645 square miles. Averaged across its land area, Alamosa County runs about 23 people per square mile. Among counties sharing Alamosa County's EPA zone, it outranks 34% of them by population. EPA's geology-based Region 8 groups Alamosa County with 290 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Alamosa County's Zone 2 prediction. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Alamosa County — testing is the only way to know an individual home's actual level.

Next steps for a home in Alamosa County

Mitigation cost doesn't depend on Alamosa 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

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

Alamosa County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.