Which agency is responsible for overseeing water quality regulations in the United States?

The Environmental Protection Agency (EPA) is the agency responsible for overseeing water quality regulations in the United States. The EPA's primary role includes protecting human health and the environment by enforcing regulations based on laws passed by Congress. The agency administers the Clean Water Act, which sets the foundation for regulating discharges of pollutants into the waters of the United States and establishing quality standards for surface waters.

Additionally, the EPA develops guidelines and standards for drinking water to ensure safe public water supplies, providing oversight and support for state and local water regulation efforts. Its comprehensive approach includes monitoring water quality, assessment of pollution sources, and facilitating research into water-related issues.

In contrast, the Food and Drug Administration (FDA) mainly focuses on the safety of food, medications, and cosmetics, while the Centers for Disease Control and Prevention (CDC) is involved in public health promotion and disease prevention. The Department of Agriculture (USDA) primarily deals with food safety and agriculture-related issues, which does not encompass the broader scope of water quality regulations.