Payette County, ID radon potential

Payette 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. That puts Payette County in the 50th percentile nationally for radon potential — higher than 50% of the counties EPA has rated.

Payette County by the numbers

Payette County, Idaho is home to about 27,662 people across 406.88 square miles. Population density there runs about 68 people per square mile. Within its own EPA zone, Payette County is bigger by population than 51% of the counties that share it. Payette County falls in EPA Radon Region 10, one of 142 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Payette County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Middle-of-the-pack doesn't mean risk-free for any one Payette County address — a moderate county average still leaves individual homes to test either side of it.

Next steps for a home in Payette 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 Payette County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Payette County'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 Payette County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Payette County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.