The management of coal ash waste from MidAmerican Energy’s plants in Iowa is the subject of an in-depth analysis conducted by the Interdisciplinary Environmental Clinic at Washington University, in partnership with the Sierra Club and the Iowa Environmental Council. This study reveals the health risks presented by elevated toxin levels in the groundwater surrounding five plants owned by MidAmerican. The data, collected by the company itself under federal water monitoring rules, shows alarming contamination.
Elevated Toxic Metals in Groundwater
MidAmerican Energy’s facilities, including ash ponds and landfill storage sites, cover more than 700 acres and reach depths of up to 135 feet. The disposal of these wastes into the environment exposes the local population to toxic heavy metals such as mercury, arsenic, and lead. These substances, seeping into groundwater, contaminate drinking water and food resources, threatening the health of local residents.
Monitoring reports show lithium levels in the groundwater at the Ottumwa plant up to seven times higher than federal limits since 2020. Prolonged exposure to lithium can cause gastrointestinal and neurological effects, as well as thyroid and kidney disorders. Other concerning contaminations include cobalt, which exceeds water quality standards, increasing the risks of heart disease and endocrine disruptions.
Persistent Groundwater Contamination
Although some landfills have been closed, the contamination persists. Unlined coal ash storage sites, such as those around the George Neal North and South plants, have allowed these toxins to infiltrate groundwater. High concentrations of substances like boron, sulfate, and radium continue to be detected, particularly in the 2023 reports. These contaminants pose an immediate public health concern and are likely to remain for decades.
Local authorities, such as the Iowa Department of Natural Resources (Iowa DNR), are being urged to take immediate action to mitigate the risks posed by these wastes. However, efforts by energy companies, supported by powerful lobbying, to weaken federal protections on coal ash management complicate the situation.
Contradictory Renewable Energy Vision
Despite public statements by MidAmerican Energy about its commitment to 100% renewable energy, a significant portion of its energy still comes from coal-fired plants. Approximately 25% of the electricity generated by MidAmerican is still produced through coal combustion, highlighting the contradiction between the company’s environmental goals and its current waste management practices.
