Is Windsor County, VT a radon risk area?

Windsor 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. Nationally that's the 56th percentile for radon potential — Windsor County outranks 56% of every county EPA has rated.

Windsor County by the numbers

About 57,697 people live in Windsor County, Vermont, spread over 969.144 square miles. That works out to roughly 60 people per square mile. Rank 314 by population within its EPA zone puts Windsor County at the 70th percentile among zone peers. Geologically, Windsor County is grouped into EPA Region 1 alongside 58 other counties that share its rock and soil setting.

What this actually means for a house in Windsor County

Windsor 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 Windsor County — testing is the only way to know an individual home's actual level.

If Windsor County tests above the action level

Nothing about Windsor County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Vermont's state radon program

Windsor County's test kit answers today; a Airthings radon monitor keeps answering for Windsor County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

More on how this number was built

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