Jackson County, CO: EPA's radon zone, explained

EPA places Jackson 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. Nationally, Jackson County ranks higher in radon potential than 66% of rated counties (the 66th percentile).

Where Jackson County sits nationally

Jackson County, Colorado is home to about 1,273 people across 1,613.726 square miles. Averaged across its land area, Jackson County runs about 1 people per square mile. By population, Jackson County is the 1054th largest of every county sharing its EPA zone — the 1st percentile by population within that zone. Jackson County falls in EPA Radon Region 8, one of 291 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Jackson County

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Jackson County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. 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 Jackson County specifically.

Testing and mitigation in Jackson County

For a Jackson 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 Colorado's state radon program

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

Where Jackson County's figures come from

Jackson County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Jackson County carries, the zone explainer covers what it does and doesn't tell you about any one house.