The Town of Chelmsford has experienced a sewer force main break at the Southwell Field pump station. The break is in a 16 inch force main that transmits sewerage to the City of Lowell for treatment. While we do not believe this is a complete break of the main, an undetermined amount of sewerage is entering Deep Brook and the Merrimack River. Officials from the Department of Public Works are working closely with the Massachusetts Department of Environmental Protection, Weston and Sampson, and contractors to install a bypass main and repair the break as soon as possible. Access to the fields has been closed until further notice.