What EPA's radon map says about Renville County

Renville County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Rank it against the rest of the country and Renville County lands in the 79th percentile for radon potential.

Renville County by the numbers

About 14,453 people live in Renville County, Minnesota, spread over 982.896 square miles. That works out to roughly 15 people per square mile. Among counties sharing Renville County's EPA zone, it outranks 37% of them by population. EPA's geology-based Region 5 groups Renville County with 523 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Renville County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. Being in Zone 1 raises the odds Renville 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.

Testing and mitigation in Renville County

Mitigation cost doesn't depend on Renville 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 Minnesota's state radon program

Renville County's test kit answers today; a Airthings radon monitor keeps answering for Renville 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

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