Is Yavapai County, AZ a radon risk area?

Yavapai 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 that's the 63rd percentile for radon potential — Yavapai County outranks 63% of every county EPA has rated.

Yavapai County by the numbers

About 252,013 people live in Yavapai County, Arizona, spread over 8,122.932 square miles. Averaged across its land area, Yavapai County runs about 31 people per square mile. Rank 94 by population within its EPA zone puts Yavapai County at the 91st percentile among zone peers. Geologically, Yavapai County is grouped into EPA Region 9 alongside 94 other counties that share its rock and soil setting.

What this actually means for a house in Yavapai County

Yavapai County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. Middle-of-the-pack doesn't mean risk-free for any one Yavapai County address — a moderate county average still leaves individual homes to test either side of it.

If Yavapai County tests above the action level

Nothing about Yavapai County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Arizona's state radon program

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

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.