Bannock County, ID radon potential

Bannock County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Bannock County sits at the 59th percentile nationally for radon potential — above 59 of every 100 rated counties.

Bannock County by the numbers

Bannock County, Idaho is home to about 91,010 people across 1,112.49 square miles. Averaged across its land area, Bannock County runs about 82 people per square mile. Within its own EPA zone, Bannock County is bigger by population than 79% of the counties that share it. Bannock County falls in EPA Radon Region 10, one of 142 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Bannock County's Zone 2 prediction. A county-wide moderate average, like Bannock County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Next steps for a home in Bannock County

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 Idaho's state radon program

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

Where Bannock County's figures come from

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