Sherburne County (Sherco) Generating Station has 31 groundwater monitoring wells, 17 of which have been polluted above federal advisory levels based on samples collected between May 03, 2010 and October 29, 2014. Groundwater at this site contains unsafe levels of nitrate, sulfate, molybdenum, antimony, arsenic, cadmium and lead.Site description
Sherburne County (Sherco) Generating Station is a 2,222 MW coal-fired power plant located along the Mississippi River, about 45 miles northwest of the Twin Cities. The facility began operation in 1976 and is now made of 3 units. Sherco disposes of coal ash waste in 4 primary ash ponds and a landfill.
Sherco Generating Station is among the U.S. Environmental Protection Agency's list of potential damage cases, indicating that it has potentially polluted groundwater or surface water at levels which threaten human health and the environment.