Harrison County, WV Radon Zone Data

Harrison County, WV radon potential

EPA places Harrison County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally that's the 57th percentile for radon potential — Harrison County outranks 57% of every county EPA has rated.

Harrison County by the numbers

Harrison County, West Virginia is home to about 64,472 people across 416.01 square miles. That works out to roughly 155 people per square mile. Within its own EPA zone, Harrison County is bigger by population than 72% of the counties that share it. Geologically, Harrison County is grouped into EPA Region 3 alongside 244 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Harrison County's Zone 2 prediction lands in the gap between the two. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Harrison County — testing is the only way to know an individual home's actual level.

Next steps for a home in Harrison 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 West Virginia's state radon program

For Harrison County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Harrison 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 Harrison 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. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.