Benewah County, ID radon potential

Benewah County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Rank it against the rest of the country and Benewah County lands in the 76th percentile for radon potential.

How Benewah County compares

Benewah County, Idaho is home to about 10,529 people across 776.932 square miles. Averaged across its land area, Benewah County runs about 14 people per square mile. Within its own EPA zone, Benewah County is bigger by population than 30% of the counties that share it. Benewah County falls in EPA Radon Region 10, one of 142 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Benewah County

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Benewah County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. Being in Zone 1 raises the odds Benewah County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

If Benewah County tests above the action level

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 Benewah County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Benewah 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 Benewah County's figures come from

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