Is Jackson County, OR a radon risk area?

EPA places Jackson 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, Jackson County ranks higher in radon potential than 29% of rated counties (the 29th percentile).

Where Jackson County sits nationally

About 221,331 people live in Jackson County, Oregon, spread over 2,783.255 square miles. Averaged across its land area, Jackson County runs about 80 people per square mile. Rank 116 by population within its EPA zone puts Jackson County at the 89th percentile among zone peers. Jackson County falls in EPA Radon Region 10, one of 142 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Jackson County

Jackson County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. A Zone 3 rating means Jackson County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

If Jackson County tests above the action level

Nothing about Jackson 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 Oregon's state radon program

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

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Jackson County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.