The Baytown Township Groundwater Plume is a Superfund site located east of the village of Lake Elmo, Minnesota, United States. The plume extends into Baytown and West Lakeland Townships and continues eastward approximately four miles to the St. Croix River. Baytown Township is a rapidly developing rural/suburban residential area on the eastern edge of the Minneapolis-St. Paul metropolitan area. The contaminated groundwater is primarily in the aquifer, which is the major source of drinking water for many residents in the area through private and residential wells. The Lake Elmo Airport is located near the western end of the plume and is administered by the Metropolitan Airports Commission (MAC). An estimated 8,000 people live in the area; 80 percent of the residents use private wells for t