The Clean Water Act (CWA) established as a basic structure to discharged of pollutants into the water throughout the United States. The clean water Act started in 1948 which was called the Federal Water Pollution Control Act. In 1972 the act was reorganized and expanded. The CWA is here today because the public wanted the government to be aware of the problems. When the public did that the water pollution led to there being Amendments in 1972.
As the year went on using the Clean Water Act, there has been many laws that changed the CWA. The Grear Lakes Critical Program Act of 1990 was part of the change of CWA. Canada and the US have agreed to reduce how much toxic in the Great Lakes.