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

Washita County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally, Washita County ranks higher in radon potential than 7% of rated counties (the 7th percentile).

How Washita County compares

Washita County, Oklahoma is home to about 10,839 people across 1,003.089 square miles. That works out to roughly 11 people per square mile. By population, Washita County is the 802nd largest of every county sharing its EPA zone — the 22nd percentile by population within that zone. Washita County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Washita County

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Washita County's Zone 3 prediction is the low end of the scale. Even at Zone 3, Washita County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

Testing and mitigation in Washita County

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

Where Washita County's figures come from

Washita 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.