Alpine County, CA radon potential

EPA's own radon map rates Alpine County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Rank it against the rest of the country and Alpine County lands in the 33rd percentile for radon potential.

Alpine County by the numbers

Alpine County, California is home to about 1,099 people across 738.34 square miles. Averaged across its land area, Alpine County runs about 1 people per square mile. Within its own EPA zone, Alpine County is bigger by population than 1% of the counties that share it. Alpine County falls in EPA Radon Region 9, one of 95 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Alpine 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 county-wide moderate average, like Alpine 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 Alpine 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 California's state radon program

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

Where Alpine County's figures come from

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