What EPA's radon map says about Gila County

EPA places Gila County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Gila County sits at the 55th percentile nationally for radon potential — above 55 of every 100 rated counties.

Where Gila County sits nationally

About 54,073 people live in Gila County, Arizona, spread over 4,757.578 square miles. Population density there runs about 11 people per square mile. Among counties sharing Gila County's EPA zone, it outranks 68% of them by population. EPA's geology-based Region 9 groups Gila County with 94 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

EPA's Zone 2 rating for Gila County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Middle-of-the-pack doesn't mean risk-free for any one Gila County address — a moderate county average still leaves individual homes to test either side of it.

Testing and mitigation in Gila County

Mitigation cost doesn't depend on Gila 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 Arizona's state radon program

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

More on how this number was built

Gila 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.