Adair County, IA radon potential

Adair County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Nationally that's the 73rd percentile for radon potential — Adair County outranks 73% of every county EPA has rated.

How Adair County compares

Adair County, Iowa is home to about 7,431 people across 569.271 square miles. That works out to roughly 13 people per square mile. Within its own EPA zone, Adair County is bigger by population than 22% of the counties that share it. Geologically, Adair County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

Zone vs. an actual test

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Adair County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. Some Adair County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

If Adair County tests above the action level

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 Iowa's state radon program

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

Where Adair County's figures come from

Adair 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.