Los Alamos County, NM: EPA's radon zone, explained

Los Alamos 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, Los Alamos County ranks higher in radon potential than 46% of rated counties (the 46th percentile).

How Los Alamos County compares

Los Alamos County, New Mexico is home to about 19,675 people across 109.123 square miles. Population density there runs about 180 people per square mile. By population, Los Alamos County is the 633rd largest of every county sharing its EPA zone — the 39th percentile by population within that zone. Geologically, Los Alamos County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

Zone vs. an actual test

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Los Alamos County's Zone 2 prediction lands in the gap between the two. Nothing about a Zone 2 label lowers the case for testing in Los Alamos County — EPA recommends it in every zone, moderate included.

Next steps for a home in Los Alamos County

For a Los Alamos County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find New Mexico's state radon program

For Los Alamos County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Los Alamos County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

Where Los Alamos County's figures come from

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