Is Amador County, CA a radon risk area?

Amador 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. Rank it against the rest of the country and Amador County lands in the 54th percentile for radon potential.

Where Amador County sits nationally

About 42,026 people live in Amador County, California, spread over 594.585 square miles. Population density there runs about 71 people per square mile. Rank 389 by population within its EPA zone puts Amador County at the 62nd percentile among zone peers. EPA's geology-based Region 9 groups Amador County with 94 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Amador County

Amador 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). Nothing about a Zone 2 label lowers the case for testing in Amador County — EPA recommends it in every zone, moderate included.

Next steps for a home in Amador County

Nothing about Amador 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 California's state radon program

Amador County's test kit answers today; a Airthings radon monitor keeps answering for Amador 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 Amador County's numbers. Whatever zone Amador County carries, the zone explainer covers what it does and doesn't tell you about any one house.