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

EPA places Roanoke city in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally, Roanoke city ranks higher in radon potential than 94% of rated counties (the 94th percentile).

Roanoke city by the numbers

Roanoke city, Virginia is home to about 97,912 people across 42.521 square miles. That works out to roughly 2,303 people per square mile. By population, Roanoke city is the 201st largest of every county sharing its EPA zone — the 81st percentile by population within that zone.

Why the zone isn't the answer by itself

Where the national indoor average runs about 1.3 pCi/L, Roanoke city's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. That doesn't mean every Roanoke city house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

Testing and mitigation in Roanoke city

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

Where Roanoke city's figures come from

The methodology guide shows exactly which EPA and Census sources feed Roanoke city's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.