Milton L. Kapp Generating Station

Milton L. Kapp Generating Station has 6 groundwater monitoring wells, 6 of which have been polluted above federal advisory levels based on samples collected between March 28, 2018 and December 10, 2019. Groundwater at this site contains unsafe levels of boron, molybdenum, lithium, sulfate and arsenic.

Interstate Power and Light’s (a subsidiary of Alliant Energy) Milton L. Kapp Generating Station is in Clinton, Iowa River in Clinton County. The facility was originally constructed in 1947, with two coal-fired units and a net capacity of 237-MW at its peak. Both units were retired in 2010 and 2018, respectively. The plant has two unlined ash ponds and an unlined ash landfill. The ash ponds were constructed in the 1970's, and the landfill was constructed in the mid-1980's. Groundwater beneath the site generally flows toward the west-northwest. Lansing’s Upper Ash Pond is scheduled to be closed by October 17, 2023 by a combination of CCR removal, consolidation, and in-place closure with a cap. You can find the industry-reported data here.