What EPA's radon map says about Wells County

EPA places Wells 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. Wells County sits at the 85th percentile nationally for radon potential — above 85 of every 100 rated counties.

Wells County by the numbers

About 28,798 people live in Wells County, Indiana, spread over 368.087 square miles. That works out to roughly 78 people per square mile. Among counties sharing Wells County's EPA zone, it outranks 55% of them by population. Wells County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Wells County

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Wells County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. Being in Zone 1 raises the odds Wells County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

If Wells County tests above the action level

Mitigation cost doesn't depend on Wells 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 Indiana's state radon program

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

More on how this number was built

Wells 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.