Northwest Arctic Borough, AK radon potential

Northwest Arctic Borough is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Northwest Arctic Borough sits at the 4th percentile nationally for radon potential — above 4 of every 100 rated counties.

Where Northwest Arctic Borough sits nationally

Northwest Arctic Borough, Alaska is home to about 7,134 people across 35,671.697 square miles. That works out to roughly 0 people per square mile. Within its own EPA zone, Northwest Arctic Borough is bigger by population than 13% of the counties that share it. Geologically, Northwest Arctic Borough is grouped into EPA Region 10 alongside 141 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

At Zone 3, Northwest Arctic Borough's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. Don't read Zone 3 as a pass for Northwest Arctic Borough — EPA's guidance to test every home makes no exception for counties predicted low.

Testing and mitigation in Northwest Arctic 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 Northwest Arctic Borough, an ongoing number beats a one-time test - a Airthings radon monitor tracks Northwest Arctic Borough's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

Where Northwest Arctic Borough's figures come from

Northwest Arctic Borough's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.