Superfund Site Profile
The Baytown Township Ground Water Plume site is located in Washington County, Minnesota. It includes parts of Baytown Township, West Lakeland Township, the City of Bayport, and the City of Lake Elmo. The site consists of a contaminated groundwater plume located primarily in the Prairie du Chien Aquifer, the Jordan Sandstone Aquifer and, in certain areas, the Tunnel City Aquifer. The contaminated plume covers about seven square miles. A former metal working facility in Lake Elmo is the primary source of the site’s contamination. Treatment of private and public drinking water, source area treatment, and groundwater monitoring are ongoing.
The Minnesota Department of Health (MDH) first detected trichloroethylene (TCE) in private wells in 1987 and created a Special Well Construction Area to protect residents. The site was listed on the state's Permanent List of Priorities in 1988 and multiple state and local agencies collected thousands of samples from private wells. The site was listed on the National Priorities List (NPL) in 1994. Minnesota Pollution Control Agency (MPCA) leads cleanup of the site, with oversight by EPA.
In 2000, MPCA and EPA selected a remedy for the groundwater plume and private wells which requires plume monitoring and installation and maintenance of granular activated carbon (GAC) treatment units for private wells. In 2007, MPCA and EPA amended the remedy to add drinking water treatment for the City of Bayport Municipal Well #2 and treatment for the area that was the source of the contamination. These remedies have been operating since 2008. In 2015, MPCA and EPA amended the remedy to add an additional City of Bayport municipal well to the treatment system.