The Federal Water Pollution Control Act, commonly known as the Clean Water Act, was originally passed in 1948. By 1972, Congress had voted on an amended version of the law that included the expansion of regulations to prevent pollution of the nation’s waterways. In this lesson, students consider how the Clean Water Act of 1972 became a law. They identify key moments in the evolution of this bill including its path in Congress, its veto by President Nixon and its eventual enactment. Preparing and organizing information, students interpret these key events and share them in a storyboard presentation. While intended for 8th grade students, the lesson can be adapted for other grade levels.