Page County, IA: EPA's radon zone, explained

EPA's own radon map rates Page County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Nationally, Page County ranks higher in radon potential than 79% of rated counties (the 79th percentile).

Where Page County sits nationally

Page County, Iowa is home to about 15,038 people across 534.944 square miles. That works out to roughly 28 people per square mile. By population, Page County is the 658th largest of every county sharing its EPA zone — the 38th percentile by population within that zone. Geologically, Page County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

Zone vs. an actual test

Where the national indoor average runs about 1.3 pCi/L, Page 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 Page County specifically.

If Page County tests above the action level

For a Page 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 Iowa's state radon program

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

Where Page County's figures come from

Page County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Page County carries, the zone explainer covers what it does and doesn't tell you about any one house.