Bear Lake County, ID: EPA's radon zone, explained

EPA's own radon map rates Bear Lake County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. That puts Bear Lake County in the 37th percentile nationally for radon potential — higher than 37% of the counties EPA has rated.

Bear Lake County by the numbers

Bear Lake County, Idaho is home to about 6,779 people across 975.731 square miles. Averaged across its land area, Bear Lake County runs about 7 people per square mile. By population, Bear Lake County is the 904th largest of every county sharing its EPA zone — the 12th percentile by population within that zone. Bear Lake 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

EPA's Zone 2 rating for Bear Lake County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Bear Lake County — testing is the only way to know an individual home's actual level.

If Bear Lake County tests above the action level

For a Bear Lake County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Idaho's state radon program

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

Bear Lake County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.