Allamakee County, IA radon potential

EPA's own radon map rates Allamakee County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Nationally that's the 78th percentile for radon potential — Allamakee County outranks 78% of every county EPA has rated.

Where Allamakee County sits nationally

Allamakee County, Iowa is home to about 14,184 people across 639.071 square miles. Population density there runs about 22 people per square mile. Within its own EPA zone, Allamakee County is bigger by population than 36% of the counties that share it. Allamakee County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Allamakee County

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Allamakee County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. Some Allamakee 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 Allamakee 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 Allamakee County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Allamakee County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Allamakee County's figures come from

Allamakee 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.