Cochise County, AZ: EPA's radon zone, explained

Cochise 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. That puts Cochise County in the 61st percentile nationally for radon potential — higher than 61% of the counties EPA has rated.

How Cochise County compares

Cochise County, Arizona is home to about 125,773 people across 6,209.872 square miles. Averaged across its land area, Cochise County runs about 20 people per square mile. By population, Cochise County is the 164th largest of every county sharing its EPA zone — the 84th percentile by population within that zone. Cochise County falls in EPA Radon Region 9, one of 95 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Cochise County's Zone 2 prediction lands in the gap between the two. Middle-of-the-pack doesn't mean risk-free for any one Cochise County address — a moderate county average still leaves individual homes to test either side of it.

If Cochise County tests above the action level

For a Cochise 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 Arizona's state radon program

For Cochise County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Cochise 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 Cochise County's figures come from

Cochise 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.