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South Dakota Offers the Basics on Radon

by Margaret Henderson

Much of the eastern portion of South Dakota is classified as Zone 1, High Potential, where predicted radon concentrations would be greater than 4 pCi/L, the USEPA recommended action level. The remainder of the state is classified as Zone 2, Moderate Potential, with levels predicted to be between 2 and 4 pCi/L. Radon test results, since the 1980s, have been collected and used to create a South Dakota “Radon Potential by County” map from comparisons with geological formations.

Due to the anticipated presence of radon in all of the state, the South Dakota Department of Environmental and Natural Resources encourages testing as the only way to know what radon concentrations are in any home. The Department provides technical radon assistance and provides a webpage about radon with general information.

Included in the basic information on radon provided are sections on:

  • How to test;
  • Mitigation; and
  • Resource links.

Methods to reduce radon concentrations are discussed and cost estimates are given as $1200 for average installation cost and $3.00 per month for operating the system in South Dakota.

The Department cautions that the state radon map should not be used as a substitute for testing in that levels may vary throughout each zone.

For more information, see