coliform bacteria levels forced frequent swimming prohibitions along the harbor beaches and the Charles River for many years. The city of Quincy sued the Metropolitan District Commission (MDC) and the separate Boston Water and Sewer Commission in 1982, charging that unchecked systemic pollution of the city's waterfront contributed to the problem. That suit was followed by one by Conservation Law Foundation and finally by the United States government, resulting in the landmark court-ordered cleanup of Boston Harbor. The lawsuits forced then-Massachusetts Governor Michael Dukakis to propose separating the water and sewer treatment divisions from the MDC, resulting in the creation of the Massachusetts Water Resources Authority in 1985. The slow progress of the cleanup became a key theme of the 1988 U.S. presidential election as George H. W. Bush defeated Dukakis partly through campaign speeches casting doubt on the governor's environmental record, which Dukakis himself had claimed was better than that of Bush. The court-ordered cleanup continued throughout the next two decades and is still ongoing. Before the clean-up projects, the water was so polluted that The Standells released a song in 1965 called "Dirty Water" which referred to the sorry state of the Charles River. Neal Stephenson, who attended Boston University from 1977 to 1981, based his second novel, Zodiac, around pollution of the harbor. Since the writing of the song, the water quality in both the Harbor and the Charles River has significantly improved, and the projects have dramatically transformed Boston Harbor from one of the filthiest in the nation to one of the cleanest. Today, Boston Harbor is safe for fishing and for swimming nearly every day, though there are still beach closings after even small rainstorms, caused by bacteria-laden storm water and the occasional combined sewer overflow. In 2022, pieces of plastic transmission line used in rock explosives, (known as explosive shock tubing) began washing up on coastal shores of Cape Cod and Rhode Island. This led to an investigation that was conducted by the U.S. Army Corps of Engineers, it was suspected to have been related to a concluded Boston Harbor dredging project. The outcome was to seek to find methods to prevent future environmental impacts from reoccurring. Geography Boston Harbor is a large harbor which constitutes the western extremity of Massachusetts Bay. The harbor is sheltered from Massachusetts Bay and the open Atlantic Ocean by a combination of the Winthrop Peninsula and Deer Island