Trego County, KS radon potential

EPA places Trego County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Trego County sits at the 68th percentile nationally for radon potential — above 68 of every 100 rated counties.

Trego County by the numbers

Trego County, Kansas is home to about 2,774 people across 889.474 square miles. Population density there runs about 3 people per square mile. Within its own EPA zone, Trego County is bigger by population than 7% of the counties that share it. Trego County falls in EPA Radon Region 7, one of 412 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

Trego 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. 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 Trego County specifically.

Next steps for a home in Trego 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 Kansas's state radon program

For Trego County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Trego 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 Trego County's figures come from

Trego County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.