What EPA's radon map says about Fairbanks North Star Borough
EPA places Fairbanks North Star Borough in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Fairbanks North Star Borough in the 59th percentile nationally for radon potential — higher than 59% of the counties EPA has rated.
Where Fairbanks North Star Borough sits nationally
About 94,951 people live in Fairbanks North Star Borough, Alaska, spread over 7,334.994 square miles. Averaged across its land area, Fairbanks North Star Borough runs about 13 people per square mile. Among counties sharing Fairbanks North Star Borough's EPA zone, it outranks 80% of them by population. EPA's geology-based Region 10 groups Fairbanks North Star Borough with 141 other counties nationally sharing its underlying rock and soil profile.
Zone vs. an actual test
Fairbanks North Star Borough'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. Fairbanks North Star Borough's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.
Testing and mitigation in Fairbanks North Star Borough
Mitigation cost doesn't depend on Fairbanks North Star Borough's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.
Find Alaska's state radon program
Fairbanks North Star Borough's test kit answers today; a Airthings radon monitor keeps answering for Fairbanks North Star Borough 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 Fairbanks North Star Borough's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.