Which agency primarily regulates wastewater treatment plants in the U.S.?

The Environmental Protection Agency (EPA) is the primary agency responsible for regulating wastewater treatment plants in the U.S. This authority stems from the Clean Water Act, which empowers the EPA to set standards for water quality and manage the national pollution control program. The Agency oversees the implementation of regulations at both federal and state levels, ensuring that wastewater treatment facilities adhere to stringent guidelines designed to protect public health and the environment. By establishing discharge permits and standards for effluent, the EPA plays a crucial role in maintaining safe and sustainable water resources across the country.

The other agencies mentioned have different focuses that do not pertain specifically to the regulation of wastewater treatment plants.