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

Norfolk city is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. That puts Norfolk city in the 29th percentile nationally for radon potential — higher than 29% of the counties EPA has rated.

Where Norfolk city sits nationally

Norfolk city, Virginia is home to about 231,105 people across 53.275 square miles. That works out to roughly 4,338 people per square mile. By population, Norfolk city is the 113th largest of every county sharing its EPA zone — the 89th percentile by population within that zone.

What this actually means for a house in Norfolk city

At Zone 3, Norfolk city'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. Even at Zone 3, Norfolk city homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

Testing and mitigation in Norfolk city

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

Where Norfolk city's figures come from

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