Which is NOT a law that regulates clean water?

The Toxic Substances Control Act is primarily focused on regulating the introduction of new or already existing chemicals in the United States, rather than specifically addressing water quality or the pollution of aquatic environments. Its main goal is to ensure that the manufacturing, processing, distribution, use, and disposal of chemicals are conducted in a manner that protects human health and the environment from potential risks associated with chemical substances.

In contrast, the other laws mentioned directly target water quality and pollution control. The Water Pollution Control Act and the Clean Water Act specifically aim to reduce and manage water pollution, establishing regulations and standards for the discharge of pollutants into U.S. waters. The Safe Drinking Water Act, meanwhile, focuses on ensuring that the water supply is safe for human consumption by setting standards for drinking water quality.

By understanding the focus of these different regulations, it becomes clear why the Toxic Substances Control Act does not fall under the category of laws dedicated to clean water regulation.