Augusta County, VA radon potential

EPA places Augusta County 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 that's the 93rd percentile for radon potential — Augusta County outranks 93% of every county EPA has rated.

Augusta County by the numbers

Augusta County, Virginia is home to about 78,622 people across 967.074 square miles. That works out to roughly 81 people per square mile. Within its own EPA zone, Augusta County is bigger by population than 78% of the counties that share it. EPA's geology-based Region 3 groups Augusta County with 244 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Augusta County

Where the national indoor average runs about 1.3 pCi/L, Augusta County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. Being in Zone 1 raises the odds Augusta County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

Next steps for a home in Augusta County

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

Where Augusta County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Augusta County's numbers. Whatever zone Augusta County carries, the zone explainer covers what it does and doesn't tell you about any one house.