What EPA's radon map says about Harding County

Harding 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, Harding County ranks higher in radon potential than 33% of rated counties (the 33rd percentile).

How Harding County compares

About 635 people live in Harding County, New Mexico, spread over 2,125.478 square miles. Averaged across its land area, Harding County runs about 0 people per square mile. Among counties sharing Harding County's EPA zone, it outranks 0% of them by population. EPA's geology-based Region 6 groups Harding County with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Harding County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Harding County — testing is the only way to know an individual home's actual level.

If Harding County tests above the action level

Mitigation cost doesn't depend on Harding 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

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

Harding County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Harding County carries, the zone explainer covers what it does and doesn't tell you about any one house.