Polk County, MN Radon Zone Data

Polk County, MN radon potential

EPA places Polk 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, Polk County ranks higher in radon potential than 85% of rated counties (the 85th percentile).

How Polk County compares

Polk County, Minnesota is home to about 30,413 people across 1,970.996 square miles. That works out to roughly 15 people per square mile. Within its own EPA zone, Polk County is bigger by population than 57% of the counties that share it. Polk County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Polk 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 Polk 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 Polk County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find Minnesota's state radon program

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

Where Polk County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Polk County carries, the zone explainer covers what it does and doesn't tell you about any one house.