Alfalfa County, OK: EPA's radon zone, explained

Alfalfa County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally, Alfalfa County ranks higher in radon potential than 3% of rated counties (the 3rd percentile).

How Alfalfa County compares

Alfalfa County, Oklahoma is home to about 5,712 people across 866.565 square miles. Averaged across its land area, Alfalfa County runs about 7 people per square mile. By population, Alfalfa County is the 925th largest of every county sharing its EPA zone — the 10th percentile by population within that zone. EPA's geology-based Region 6 groups Alfalfa County with 502 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Alfalfa County

A Zone 3 county like Alfalfa County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Don't read Zone 3 as a pass for Alfalfa County — EPA's guidance to test every home makes no exception for counties predicted low.

Next steps for a home in Alfalfa County

For a Alfalfa 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 Oklahoma's state radon program

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

Where Alfalfa County's figures come from

Alfalfa 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.