Which agency is primarily responsible for enforcing the Safe Drinking Water Act?

The agency primarily responsible for enforcing the Safe Drinking Water Act is the Environmental Protection Agency (EPA). This agency plays a crucial role in ensuring that public drinking water systems comply with federal standards for safety and health. The Safe Drinking Water Act aims to protect public health by regulating the nation's public drinking water supply. The EPA sets enforceable standards for contaminants in drinking water and oversees states in implementing these regulations.

The other agencies listed have specific functions that do not align with enforcing drinking water safety. The Occupational Safety and Health Administration focuses on workplace health and safety, the Federal Emergency Management Agency deals with disaster preparedness and response, and the National Oceanic and Atmospheric Administration primarily monitors the oceans, atmospheric conditions, and related environmental aspects. Thus, the EPA's dedication to environmental protection aligns it closely with the mandates of the Safe Drinking Water Act.