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

EPA's own radon map rates Franklin city zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. Rank it against the rest of the country and Franklin city lands in the 5th percentile for radon potential.

How Franklin city compares

Franklin city, Virginia is home to about 8,373 people across 8.277 square miles. That works out to roughly 1,012 people per square mile. By population, Franklin city is the 867th largest of every county sharing its EPA zone — the 16th percentile by population within that zone.

Zone vs. an actual test

At Zone 3, Franklin 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. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Franklin city testing above the action level often enough that skipping a test isn't the safe assumption.

If Franklin city tests above the action level

For a Franklin 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 Franklin city, an ongoing number beats a one-time test - a Airthings radon monitor tracks Franklin 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 Franklin 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. Whatever zone Franklin city carries, the zone explainer covers what it does and doesn't tell you about any one house.