Webster County, NE: EPA's radon zone, explained

EPA's own radon map rates Webster County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Webster County sits at the 69th percentile nationally for radon potential — above 69 of every 100 rated counties.

Webster County by the numbers

Webster County, Nebraska is home to about 3,326 people across 574.913 square miles. That works out to roughly 6 people per square mile. By population, Webster County is the 973rd largest of every county sharing its EPA zone — the 9th percentile by population within that zone. Geologically, Webster County is grouped into EPA Region 7 alongside 411 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Webster County's predicted average sits above EPA's own action level of 4 pCi/L — the concentration at which EPA recommends fixing a home — versus a national average around 1.3 pCi/L indoors and 0.4 pCi/L outdoors. 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 Webster County will test well under the action level, and EPA's guidance is to test regardless of zone.

If Webster County tests above the action level

For a Webster County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Nebraska's state radon program

For Webster County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Webster County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

Where Webster County's figures come from

Webster County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Webster County carries, the zone explainer covers what it does and doesn't tell you about any one house.