Saline County, IL radon potential

Saline County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Rank it against the rest of the country and Saline County lands in the 47th percentile for radon potential.

Where Saline County sits nationally

Saline County, Illinois is home to about 22,826 people across 379.996 square miles. Population density there runs about 60 people per square mile. Within its own EPA zone, Saline County is bigger by population than 44% of the counties that share it. Saline County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Saline County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Saline County — testing is the only way to know an individual home's actual level.

Testing and mitigation in Saline County

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 Illinois's state radon program

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.