The Potomac River is on of the largest rivers on the Atlantic seaboard; it flows more than 380 miles through Virginia, West Virginia, Pennsylvania, Maryland, the District of Columbia and into the Chesapeake Bay. The river provides habitat, drinking water, and recreational havens. However, pollution from many sources degrades water quality, threatens fish and wildlife, and poses risks to human health. Fortunately, you can make a difference by submitting public comments on water pollution discharge permits. Comments enable you to voice your concerns and advocate for improved water quality.