Bonneville County, ID radon potential

EPA places Bonneville County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Bonneville County in the 61st percentile nationally for radon potential — higher than 61% of the counties EPA has rated.

Where Bonneville County sits nationally

Bonneville County, Idaho is home to about 133,644 people across 1,865.96 square miles. Population density there runs about 72 people per square mile. Within its own EPA zone, Bonneville County is bigger by population than 85% of the counties that share it. Bonneville County falls in EPA Radon Region 10, one of 142 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Bonneville County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. Bonneville County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.