Which of the following does the Safe Drinking Water Act NOT regulate?

The Safe Drinking Water Act (SDWA) is primarily focused on regulating public drinking water systems to ensure the safety and quality of drinking water for the general public. This includes setting standards for drinking water quality and overseeing the enforcement of those standards by state authorities.

Wastewater treatment plants, however, fall outside the purview of the SDWA. Instead, they are primarily regulated by the Clean Water Act, which aims to restore and maintain the integrity of the nation's waters by preventing point source pollution and regulating discharges into water bodies. Because wastewater treatment is focused on treated effluent going back into surface waters rather than the quality of drinking water supplied to consumers, it is not included in the SDWA regulations.

In contrast, public drinking water systems, private wells used for drinking, and all public water suppliers are directly impacted by the regulations set forth in the SDWA, as these entities are responsible for providing safe drinking water to the public.