2000

• The Commonwealth of Virginia plans to sue the State of Maryland over its right to draw drinking water from the Potomac River, which runs between the two states.
• The cause of a large fish kill in Rock Creek in Washington, D.C. is traced to a storm drain near an exterminator's offices in a Maryland suburb.

Present

• The Annual Potomac River Watershed Cleanup has expanded to include the entire Potomac watershed with 5,450 volunteers participating at 296 sites in 2005.