Washington County, NY radon potential

EPA's own radon map rates Washington County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Rank it against the rest of the country and Washington County lands in the 91st percentile for radon potential.

Where Washington County sits nationally

Washington County, New York is home to about 59,839 people across 831.19 square miles. Averaged across its land area, Washington County runs about 72 people per square mile. Within its own EPA zone, Washington County is bigger by population than 74% of the counties that share it. Geologically, Washington County is grouped into EPA Region 2 alongside 82 other counties that share its rock and soil setting.

What this actually means for a house in Washington County

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Washington County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Washington County will test well under the action level, and EPA's guidance is to test regardless of zone.

Next steps for a home in Washington 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 New York's state radon program

For Washington County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Washington 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 Washington County's figures come from

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Washington County carries, the zone explainer covers what it does and doesn't tell you about any one house.