Fauquier County, VA radon potential

Fauquier County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. That puts Fauquier County in the 58th percentile nationally for radon potential — higher than 58% of the counties EPA has rated.

Where Fauquier County sits nationally

Fauquier County, Virginia is home to about 75,865 people across 647.994 square miles. Averaged across its land area, Fauquier County runs about 117 people per square mile. Within its own EPA zone, Fauquier County is bigger by population than 76% of the counties that share it. Fauquier County falls in EPA Radon Region 3, one of 245 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Fauquier County

Fauquier County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Fauquier County — testing is the only way to know an individual home's actual level.

If Fauquier County tests above the action level

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 Virginia's state radon program

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

Where Fauquier County's figures come from

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