North Slope Borough, AK radon potential

EPA's own radon map rates North Slope Borough zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. North Slope Borough sits at the 7th percentile nationally for radon potential — above 7 of every 100 rated counties.

Where North Slope Borough sits nationally

North Slope Borough, Alaska is home to about 10,663 people across 88,792.783 square miles. Population density there runs about 0 people per square mile. Within its own EPA zone, North Slope Borough is bigger by population than 22% of the counties that share it. Geologically, North Slope Borough is grouped into EPA Region 10 alongside 141 other counties that share its rock and soil setting.

Zone vs. an actual test

North Slope 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. A Zone 3 label describes North Slope Borough's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

Next steps for a home in North Slope Borough

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 Alaska's state radon program

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

Where North Slope Borough's figures come from

The methodology guide shows exactly which EPA and Census sources feed North Slope Borough's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.