The Clean Air Act is a United States federal law designed to control air pollution on a national level. It is one of the United States' first and most influential modern environmental laws, and one of the most comprehensive air quality laws in the world. The Act calls for states and EPA to solve multiple air pollution problems through programs based on the latest science and technology information. Despite the dramatic progress to date, air pollution continues to threaten Americans’ health and welfare.
The Clean Water Act (CWA) establishes the basic structure for regulating discharges of pollutants into the waters of the United States and regulating quality standards for surface waters. The basis of the CWA was enacted in 1948 and was called the Federal Water Pollution Control Act, but the Act was significantly reorganized and expanded in 1972. "Clean Water Act" became the Act's common name with amendments in 1972.
Under the CWA, EPA has implemented pollution control programs such as setting wastewater standards for industry the Clean Water Act stands as one of the great success stories of environmental law. The law flatly stated there would be no discharge of pollutants from a point source (a pipe or ditch) into navigable waters without a permit.