Lincoln County, WA: EPA's radon zone, explained

Lincoln 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. Nationally that's the 41st percentile for radon potential — Lincoln County outranks 41% of every county EPA has rated.

Lincoln County by the numbers

Lincoln County, Washington is home to about 11,862 people across 2,310.603 square miles. Population density there runs about 5 people per square mile. By population, Lincoln County is the 787th largest of every county sharing its EPA zone — the 24th percentile by population within that zone. EPA's geology-based Region 10 groups Lincoln County with 141 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

EPA's Zone 2 rating for Lincoln County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Lincoln County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

If Lincoln County tests above the action level

For a Lincoln 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 Washington's state radon program

For Lincoln County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Lincoln County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Lincoln County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Lincoln County's numbers. Whatever zone Lincoln County carries, the zone explainer covers what it does and doesn't tell you about any one house.