By Margaret Henderson
The course of the Missouri River approximates the dividing line between the radon classification Zones 1 and 2 in South Dakota, but the radon levels may vary considerably, noted Barbara Regynski of the South Dakota Department of Environment and Natural Resources Radon Program. She explained that in reviewing the test results, which have been collected since the 1980s, a reading over 1000 pCi/L was found in Zone 2. The EPA recommended radon action level is 4pCi/L. Zone 1 areas are predicted to have radon concentrations that average greater than 4pCi/L and radon concentrations in Zone 2 areas are predicted to average between 2 and 4 pCi/L. There are no Zone 3 areas in South Dakota, where concentrations would be predicted to be below 2 pCi/L.
Ms. Regynski noted and as she explains to the public, “The only way to determine radon concentrations in a building is to test.” As test results have shown, the Zone maps should not be used as a substitute for an actual radon test. Some local hardware stores and the State Health Laboratory have test kits available. They may be obtained by sending a written request along with a $17.00 check to 615 E. 4th Street, Pierre, SD, 57501.
Much of South Dakota has a sparse population. The state covers 75,811 square miles with 10.7 persons per square mile (2010 census data). Much of the state’s drinking water comes from ground water sources. Ms. Regynski noted that some mitigations are being done due to radon in water that supplies homes.
The Radon Program maintains a helpful website with information about radon and testing, provides links to mitigation sources and gives the EPA contact information and links to relevant publications.
Contacts for further information about radon in South Dakota:
Barbara Regynski barb.regynski@state.sd.us
http://denr.sd.gov/des/aq/aarad.aspx
Toll Free Phone Number 1-800-GET-DENR (438-3367)
State Health Laboratory (605) 773-3368 to order test kits
United States