Campbell County, SD radon potential

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

Campbell County by the numbers

Campbell County, South Dakota is home to about 1,342 people across 733.767 square miles. Averaged across its land area, Campbell County runs about 2 people per square mile. Within its own EPA zone, Campbell County is bigger by population than 1% of the counties that share it. Campbell 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 Campbell County

Where the national indoor average runs about 1.3 pCi/L, Campbell County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. That doesn't mean every Campbell County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

Next steps for a home in Campbell County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find South Dakota's state radon program

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

Where Campbell County's figures come from

Campbell 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.