Nelson Dewey Generating Station

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Nelson Dewey Generating Station has 8 groundwater monitoring wells, 4 of which have been polluted above federal advisory levels based on samples collected between December 09, 2015 and October 15, 2019. Groundwater at this site contains unsafe levels of boron, molybdenum, thallium, arsenic, cobalt and selenium.

Site description

Nelson Dewey Generating Station was a 200 MW coal-fired station before it retired in December 2015. It was located along the Mississippi River in Cassville, Wisconsin. Its owner, Alliant Energy, settled air pollution violations with the EPA in 2013 by agreeing to spend $1.2 billion to clean up coal-fired power plants and shut down older plants. Nelson Dewey Generation Station was one of the plants that retired. The Slag Pond near the station is regulated under the CCR rule. You can find the industry-reported data here. For more information on the Nelson Dewey Generating Station, see EIP’s 2019 National Coal Ash Report.

Monitoring Wells Wells reporting one or more exceedances for at least one pollutant.
4 / 8
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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 molybdenum selenium thallium
Pollutants monitored and below guidelines
antimony barium beryllium cadmium chromium fluoride lead lithium mercury radium sulfate
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 Friday, October 14, 2022 02:57:58 PM EDT