Rio Arriba County, NM Radon Zone Data

Rio Arriba County, NM radon potential

Rio Arriba County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. That puts Rio Arriba County in the 88th percentile nationally for radon potential — higher than 88% of the counties EPA has rated.

How Rio Arriba County compares

Rio Arriba County, New Mexico is home to about 39,955 people across 5,860.876 square miles. Population density there runs about 7 people per square mile. Within its own EPA zone, Rio Arriba County is bigger by population than 64% of the counties that share it. EPA's geology-based Region 6 groups Rio Arriba County with 502 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Rio Arriba County

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Rio Arriba County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Rio Arriba County specifically.

Testing and mitigation in Rio Arriba County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find New Mexico's state radon program

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

Where Rio Arriba County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.