Kodiak Island Borough, AK radon potential

Kodiak Island Borough is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. That puts Kodiak Island Borough in the 9th percentile nationally for radon potential — higher than 9% of the counties EPA has rated.

How Kodiak Island Borough compares

Kodiak Island Borough, Alaska is home to about 12,654 people across 6,689.486 square miles. Averaged across its land area, Kodiak Island Borough runs about 2 people per square mile. Within its own EPA zone, Kodiak Island Borough is bigger by population than 27% of the counties that share it. EPA's geology-based Region 10 groups Kodiak Island Borough with 141 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Kodiak Island Borough's Zone 3 prediction is the low end of the scale. A Zone 3 rating means Kodiak Island Borough's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

Next steps for a home in Kodiak Island 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 Kodiak Island Borough, an ongoing number beats a one-time test - a Airthings radon monitor tracks Kodiak Island Borough's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

Where Kodiak Island Borough's figures come from

The methodology guide shows exactly which EPA and Census sources feed Kodiak Island Borough's numbers. Whatever zone Kodiak Island Borough carries, the zone explainer covers what it does and doesn't tell you about any one house.