Is Bristol Bay Borough, AK a radon risk area?

EPA's own radon map rates Bristol Bay Borough zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Nationally that's the 1st percentile for radon potential — Bristol Bay Borough outranks 1% of every county EPA has rated.

Bristol Bay Borough by the numbers

About 884 people live in Bristol Bay Borough, Alaska, spread over 481.382 square miles. That works out to roughly 2 people per square mile. Rank 1014 by population within its EPA zone puts Bristol Bay Borough at the 2nd percentile among zone peers. EPA's geology-based Region 10 groups Bristol Bay Borough with 141 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Bristol Bay Borough's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Bristol Bay Borough testing above the action level often enough that skipping a test isn't the safe assumption.

Next steps for a home in Bristol Bay Borough

Nothing about Bristol Bay Borough'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 Alaska's state radon program

Bristol Bay Borough's test kit answers today; a Airthings radon monitor keeps answering for Bristol Bay Borough over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

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. Whatever zone Bristol Bay Borough carries, the zone explainer covers what it does and doesn't tell you about any one house.