What EPA's radon map says about Richardson County

Richardson County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. That puts Richardson County in the 74th percentile nationally for radon potential — higher than 74% of the counties EPA has rated.

How Richardson County compares

About 7,666 people live in Richardson County, Nebraska, spread over 551.841 square miles. Population density there runs about 14 people per square mile. Among counties sharing Richardson County's EPA zone, it outranks 23% of them by population. Geologically, Richardson County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

What this actually means for a house in Richardson County

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Richardson County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Richardson County specifically.

Next steps for a home in Richardson County

Mitigation cost doesn't depend on Richardson 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

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

Richardson County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.