Turner County, SD radon potential

EPA's own radon map rates Turner County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Nationally that's the 75th percentile for radon potential — Turner County outranks 75% of every county EPA has rated.

How Turner County compares

Turner County, South Dakota is home to about 9,087 people across 617.064 square miles. Population density there runs about 15 people per square mile. Within its own EPA zone, Turner County is bigger by population than 26% of the counties that share it. EPA's geology-based Region 8 groups Turner County with 290 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Turner County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. 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 Turner County specifically.

Testing and mitigation in Turner 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 Turner County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Turner 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 Turner County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Turner County's numbers. Whatever zone Turner County carries, the zone explainer covers what it does and doesn't tell you about any one house.