Washakie County, WY: EPA's radon zone, explained

EPA's own radon map rates Washakie County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. That puts Washakie County in the 74th percentile nationally for radon potential — higher than 74% of the counties EPA has rated.

How Washakie County compares

Washakie County, Wyoming is home to about 7,662 people across 2,238.679 square miles. That works out to roughly 3 people per square mile. By population, Washakie County is the 826th largest of every county sharing its EPA zone — the 22nd percentile by population within that zone. EPA's geology-based Region 8 groups Washakie County with 290 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Where the national indoor average runs about 1.3 pCi/L, Washakie County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Washakie County will test well under the action level, and EPA's guidance is to test regardless of zone.

Next steps for a home in Washakie County

For a Washakie 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 Wyoming's state radon program

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

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