Is Murray County, OK a radon risk area?

EPA places Murray County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally that's the 9th percentile for radon potential — Murray County outranks 9% of every county EPA has rated.

Murray County by the numbers

About 13,754 people live in Murray County, Oklahoma, spread over 416.375 square miles. Population density there runs about 33 people per square mile. Rank 737 by population within its EPA zone puts Murray County at the 29th percentile among zone peers. EPA's geology-based Region 6 groups Murray County with 502 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Murray County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. Even at Zone 3, Murray 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 Murray County

Nothing about Murray County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find Oklahoma's state radon program

Murray County's test kit answers today; a Airthings radon monitor keeps answering for Murray County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. RADONZONE-10OFF at checkout knocks 10% off.

More on how this number was built

Murray 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.