Warren County, MS radon potential

EPA places Warren County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Warren County in the 21st percentile nationally for radon potential — higher than 21% of the counties EPA has rated.

Where Warren County sits nationally

Warren County, Mississippi is home to about 42,105 people across 588.536 square miles. That works out to roughly 72 people per square mile. Within its own EPA zone, Warren County is bigger by population than 62% of the counties that share it. EPA's geology-based Region 4 groups Warren County with 735 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

At Zone 3, Warren County's predicted county average is under the national indoor average (~1.3 pCi/L) and well below EPA's 4 pCi/L action level — outdoor air nationally runs about 0.4 pCi/L for comparison. Don't read Zone 3 as a pass for Warren County — EPA's guidance to test every home makes no exception for counties predicted low.

Testing and mitigation in Warren 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 Mississippi's state radon program

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

The methodology guide shows exactly which EPA and Census sources feed Warren County's numbers. Whatever zone Warren County carries, the zone explainer covers what it does and doesn't tell you about any one house.