Mobile County, AL radon potential

EPA's own radon map rates Mobile County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts Mobile County in the 31st percentile nationally for radon potential — higher than 31% of the counties EPA has rated.

Mobile County by the numbers

Mobile County, Alabama is home to about 412,339 people across 1,229.382 square miles. Averaged across its land area, Mobile County runs about 335 people per square mile. Within its own EPA zone, Mobile County is bigger by population than 93% of the counties that share it. EPA's geology-based Region 4 groups Mobile County with 735 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Mobile County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. A Zone 3 rating means Mobile County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

Testing and mitigation in Mobile 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 Alabama's state radon program

For Mobile County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Mobile County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

Where Mobile County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Mobile County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.