Big Stone Plant

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Big Stone Plant has 15 groundwater monitoring wells, 15 of which have been polluted above federal advisory levels based on samples collected between September 07, 2016 and August 14, 2017. Groundwater at this site contains unsafe levels of lithium, sulfate, boron, cobalt, molybdenum, arsenic, lead and radium.

Site description

Otter Tail Power's Big Stone Plant opened in 1975 and is located on the banks of the Big Stone Lake, South Dakota. It has one coal-fired generating unit that is capable of producing 450-MW of electricity. The plant has two units regulated under the CCR rule: Slag Pond Area and Ash Disposal Area. CCR is also temporarily stored on-site in the Temporary Storage Area, located right next to the Slag Pond Area. . Big Stone Plant is among the U.S. Environmental Protection Agency's list of potential damage cases, indicating that coal ash disposal at the site has potentially polluted groundwater or surface water at levels which threaten human health and the environment.

You can find the industry-reported data here. For more information on the Big Stone Plant, see EIP’s 2019 National Coal Ash Report .

Monitoring Wells Wells reporting one or more exceedances for at least one pollutant.
15 / 15
Wells not shown Locations for the following wells are unavailable:

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No exceedances
One or more exeedances
No data available
Other designation
Well "halo" size corresponds to mean concentration. Please note that some wells may not be visible on the map due to overlapping locations.
Pollutants monitored and above guidelines
Tip: Click on a contaminant to view wells that have recorded exceedances. Click again to remove the filter. arsenic boron cobalt lead lithium molybdenum radium sulfate
Pollutants monitored and below guidelines
antimony barium beryllium cadmium chromium fluoride mercury selenium thallium
Pollutants not monitored
ammonia, copper, cyanide, gross alpha particle, gross beta particle, hexavalent chromium, manganese, nickel, nitrate, nitrite, silver, strontium, tritium, uranium

Facility last updated on Monday, October 24, 2022 02:13:51 PM EDT