What EPA's radon map says about Essex County

EPA's own radon map rates Essex County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally that's the 37th percentile for radon potential — Essex County outranks 37% of every county EPA has rated.

Essex County by the numbers

About 6,037 people live in Essex County, Vermont, spread over 662.371 square miles. Averaged across its land area, Essex County runs about 9 people per square mile. Among counties sharing Essex County's EPA zone, it outranks 11% of them by population. Geologically, Essex 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 Essex County

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

If Essex County tests above the action level

Mitigation cost doesn't depend on Essex County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Vermont's state radon program

Essex County's test kit answers today; a Airthings radon monitor keeps answering for Essex 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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.