Morgan County, IL: EPA's radon zone, explained

EPA's own radon map rates Morgan County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Nationally, Morgan County ranks higher in radon potential than 86% of rated counties (the 86th percentile).

Morgan County by the numbers

Morgan County, Illinois is home to about 32,618 people across 568.959 square miles. That works out to roughly 57 people per square mile. By population, Morgan County is the 445th largest of every county sharing its EPA zone — the 58th percentile by population within that zone. Morgan County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Morgan County

Morgan County's predicted average sits above EPA's own action level of 4 pCi/L — the concentration at which EPA recommends fixing a home — versus a national average around 1.3 pCi/L indoors and 0.4 pCi/L outdoors. 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 Morgan County specifically.

Testing and mitigation in Morgan County

For a Morgan 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 Illinois's state radon program

For Morgan County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Morgan 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 Morgan County's figures come from

Morgan 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.