Is La Paz County, AZ a radon risk area?

La Paz 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 La Paz County in the 44th percentile nationally for radon potential — higher than 44% of the counties EPA has rated.

How La Paz County compares

About 16,992 people live in La Paz County, Arizona, spread over 4,496.579 square miles. Averaged across its land area, La Paz County runs about 4 people per square mile. Rank 673 by population within its EPA zone puts La Paz County at the 35th percentile among zone peers. EPA's geology-based Region 9 groups La Paz County with 94 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

La Paz 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 La Paz County — testing is the only way to know an individual home's actual level.

Testing and mitigation in La Paz County

Nothing about La Paz 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

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

The methodology guide shows exactly which EPA and Census sources feed La Paz County's numbers. Whatever zone La Paz County carries, the zone explainer covers what it does and doesn't tell you about any one house.