R.M. Heskett Station has 12 groundwater monitoring wells, 12 of which have been polluted above federal advisory levels based on samples collected between February 02, 2016 and September 18, 2019. Groundwater at this site contains unsafe levels of sulfate, lithium, selenium, radium, arsenic and cobalt.Site description
R.M. Heskett Station was a 115-MW coal fired power station and a gas fired turbine owned by MDU Resources Group. The plant was located along the Missouri River in Mandan, North Dakota in Morton County. It opened in 1954 and was retired in 2021. The CCR landfill, located northwest of the station, receives coal ash, asbestos waste, and ash from tire-derived fuel. R.M. Heskett Station 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.