What EPA's radon map says about Lincoln County

EPA's own radon map rates Lincoln County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. That puts Lincoln County in the 36th percentile nationally for radon potential — higher than 36% of the counties EPA has rated.

Where Lincoln County sits nationally

About 5,556 people live in Lincoln County, Idaho, spread over 1,201.364 square miles. Averaged across its land area, Lincoln County runs about 5 people per square mile. Among counties sharing Lincoln County's EPA zone, it outranks 10% of them by population. Geologically, Lincoln County is grouped into EPA Region 10 alongside 141 other counties that share its rock and soil setting.

Zone vs. an actual test

Lincoln 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). A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Lincoln County — testing is the only way to know an individual home's actual level.

If Lincoln County tests above the action level

Mitigation cost doesn't depend on Lincoln County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Idaho's state radon program

Lincoln County's test kit answers today; a Airthings radon monitor keeps answering for Lincoln County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

More on how this number was built

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