What EPA's radon map says about Merrick County

EPA places Merrick 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 38th percentile for radon potential — Merrick County outranks 38% of every county EPA has rated.

How Merrick County compares

About 7,837 people live in Merrick County, Nebraska, spread over 487.794 square miles. Population density there runs about 16 people per square mile. Among counties sharing Merrick County's EPA zone, it outranks 15% of them by population. Merrick County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Merrick County's Zone 2 prediction. Middle-of-the-pack doesn't mean risk-free for any one Merrick County address — a moderate county average still leaves individual homes to test either side of it.

If Merrick County tests above the action level

Mitigation cost doesn't depend on Merrick 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 Nebraska's state radon program

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