Teton County, ID radon potential

EPA's own radon map rates Teton County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally, Teton County ranks higher in radon potential than 42% of rated counties (the 42nd percentile).

Teton County by the numbers

Teton County, Idaho is home to about 12,932 people across 449.091 square miles. Averaged across its land area, Teton County runs about 29 people per square mile. Within its own EPA zone, Teton County is bigger by population than 26% of the counties that share it. Geologically, Teton County is grouped into EPA Region 10 alongside 141 other counties that share its rock and soil setting.

What this actually means for a house in Teton County

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Teton County's Zone 2 prediction lands in the gap between the two. Teton County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

Testing and mitigation in Teton 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 Teton County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Teton 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 Teton County's figures come from

Teton County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.