What EPA's radon map says about Storey County

EPA places Storey 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. That puts Storey County in the 35th percentile nationally for radon potential — higher than 35% of the counties EPA has rated.

Storey County by the numbers

About 4,112 people live in Storey County, Nevada, spread over 263.8 square miles. Averaged across its land area, Storey County runs about 16 people per square mile. Among counties sharing Storey County's EPA zone, it outranks 7% of them by population. Geologically, Storey County is grouped into EPA Region 9 alongside 94 other counties that share its rock and soil setting.

What this actually means for a house in Storey County

Storey County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Storey County — testing is the only way to know an individual home's actual level.

If Storey County tests above the action level

Mitigation cost doesn't depend on Storey 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 Nevada's state radon program

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

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. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.