What EPA's radon map says about Aleutians East Borough

EPA places Aleutians East Borough in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Rank it against the rest of the country and Aleutians East Borough lands in the 2nd percentile for radon potential.

How Aleutians East Borough compares

About 3,632 people live in Aleutians East Borough, Alaska, spread over 6,985.375 square miles. That works out to roughly 1 people per square mile. Among counties sharing Aleutians East Borough's EPA zone, it outranks 6% of them by population. Geologically, Aleutians East Borough is grouped into EPA Region 10 alongside 141 other counties that share its rock and soil setting.

Zone vs. an actual test

Aleutians East Borough's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Aleutians East Borough testing above the action level often enough that skipping a test isn't the safe assumption.

Testing and mitigation in Aleutians East Borough

Mitigation cost doesn't depend on Aleutians East 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

Aleutians East Borough's test kit answers today; a Airthings radon monitor keeps answering for Aleutians East 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

Aleutians East Borough's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Aleutians East Borough carries, the zone explainer covers what it does and doesn't tell you about any one house.