Wright County, IA radon potential

EPA places Wright 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 that's the 77th percentile for radon potential — Wright County outranks 77% of every county EPA has rated.

Where Wright County sits nationally

Wright County, Iowa is home to about 12,729 people across 580.412 square miles. That works out to roughly 22 people per square mile. Within its own EPA zone, Wright County is bigger by population than 34% of the counties that share it. EPA's geology-based Region 7 groups Wright County with 411 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Wright County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. Some Wright 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 Wright 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 Wright County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Wright 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 Wright County's figures come from

Wright County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.