Haakon County, SD: EPA's radon zone, explained

EPA's own radon map rates Haakon County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. That puts Haakon County in the 34th percentile nationally for radon potential — higher than 34% of the counties EPA has rated.

Where Haakon County sits nationally

Haakon County, South Dakota is home to about 1,834 people across 1,810.541 square miles. Averaged across its land area, Haakon County runs about 1 people per square mile. By population, Haakon County is the 1007th largest of every county sharing its EPA zone — the 2nd percentile by population within that zone. EPA's geology-based Region 8 groups Haakon County with 290 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Haakon County

EPA's Zone 2 rating for Haakon County sits below its own 4 pCi/L action level but above the national indoor average of about 1.3 pCi/L. Middle-of-the-pack doesn't mean risk-free for any one Haakon County address — a moderate county average still leaves individual homes to test either side of it.

Testing and mitigation in Haakon County

For a Haakon 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 South Dakota's state radon program

For Haakon County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Haakon 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 Haakon County's figures come from

Haakon 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.