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Tidal waters of the Potomac River and several of its tributaries, including the Anacostia River, were placed on the 303(d) impaired waters lists of Maryland, Virginia, and the District of Columbia for elevated fish tissue levels of polychlorinated biphenyls (PCBs).
DC law designed to regulate against water pollution and preserve and restore aquatic life in District waters for aesthetic enjoyment, for recreation, and for industry.
The Washington Ship Channel and the Tidal Basin are man-made water bodies located in the southwest section of the District along the Potomac River.
The highly urbanized Anacostia River watershed covers 176 square miles in the District of Columbia and Maryland. Only 17 percent of the watershed lies within the District; much of this drainage is controlled by storm sewers or combined (storm and sanitary) sewers.