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

EPA places Converse County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Converse County sits at the 78th percentile nationally for radon potential — above 78 of every 100 rated counties.

Converse County by the numbers

Converse County, Wyoming is home to about 13,766 people across 4,254.994 square miles. Population density there runs about 3 people per square mile. By population, Converse County is the 692nd largest of every county sharing its EPA zone — the 35th percentile by population within that zone. Geologically, Converse County is grouped into EPA Region 8 alongside 290 other counties that share its rock and soil setting.

What this actually means for a house in Converse County

Converse County's predicted average sits above EPA's own action level of 4 pCi/L — the concentration at which EPA recommends fixing a home — versus a national average around 1.3 pCi/L indoors and 0.4 pCi/L outdoors. That doesn't mean every Converse County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

Next steps for a home in Converse County

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

Where Converse County's figures come from

Converse County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.