Alexandria city, VA: EPA's radon zone, explained

Alexandria city is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally, Alexandria city ranks higher in radon potential than 28% of rated counties (the 28th percentile).

How Alexandria city compares

Alexandria city, Virginia is home to about 159,102 people across 14.935 square miles. Population density there runs about 10,653 people per square mile. By population, Alexandria city is the 161st largest of every county sharing its EPA zone — the 84th percentile by population within that zone.

What this actually means for a house in Alexandria city

Alexandria city's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. Don't read Zone 3 as a pass for Alexandria city — EPA's guidance to test every home makes no exception for counties predicted low.

Testing and mitigation in Alexandria city

For a Alexandria city 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 Virginia's state radon program

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

Where Alexandria city'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.