What legislation governs drinking water quality standards?

The Safe Drinking Water Act (SDWA) is the piece of legislation specifically designed to govern the quality standards for drinking water in the United States. Enacted in 1974 and subsequently amended, the SDWA aims to protect public health by regulating the nation's public drinking water supply.

Under the SDWA, the Environmental Protection Agency (EPA) sets enforceable health standards for drinking water, which include limits on contaminants and requirements for monitoring and reporting. The act encompasses all forms of public water systems, focusing on ensuring safe and clean drinking water for all citizens.

Other options such as the Clean Water Act primarily address pollution in surface waters and do not pertain to drinking water standards directly. The Water Quality Improvement Act and the Public Health Act may include relevant provisions but are not primarily focused on establishing drinking water quality standards.