Pinal County, AZ radon potential

EPA's own radon map rates Pinal County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally that's the 64th percentile for radon potential — Pinal County outranks 64% of every county EPA has rated.

Where Pinal County sits nationally

Pinal County, Arizona is home to about 513,862 people across 5,366.684 square miles. Averaged across its land area, Pinal County runs about 96 people per square mile. Within its own EPA zone, Pinal County is bigger by population than 95% of the counties that share it. EPA's geology-based Region 9 groups Pinal 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 Pinal County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. A county-wide moderate average, like Pinal County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Next steps for a home in Pinal 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 Arizona's state radon program

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

Where Pinal 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. Whatever zone Pinal County carries, the zone explainer covers what it does and doesn't tell you about any one house.