Orange County, VA radon potential

Orange County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Rank it against the rest of the country and Orange County lands in the 88th percentile for radon potential.

Where Orange County sits nationally

Orange County, Virginia is home to about 38,986 people across 340.548 square miles. Population density there runs about 114 people per square mile. Within its own EPA zone, Orange County is bigger by population than 64% of the counties that share it. Orange County falls in EPA Radon Region 3, one of 245 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Where the national indoor average runs about 1.3 pCi/L, Orange County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. Some Orange County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

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

Where Orange County's figures come from

Orange County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Orange County carries, the zone explainer covers what it does and doesn't tell you about any one house.