What EPA's radon map says about Langlade County

EPA places Langlade 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. Nationally, Langlade County ranks higher in radon potential than 81% of rated counties (the 81st percentile).

How Langlade County compares

About 19,535 people live in Langlade County, Wisconsin, spread over 870.69 square miles. That works out to roughly 22 people per square mile. Among counties sharing Langlade County's EPA zone, it outranks 45% of them by population. EPA's geology-based Region 5 groups Langlade County with 523 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Where the national indoor average runs about 1.3 pCi/L, Langlade County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Langlade County specifically.

Testing and mitigation in Langlade County

Mitigation cost doesn't depend on Langlade 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 Wisconsin's state radon program

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

More on how this number was built

Langlade 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.