Where can the list of toxic pollutants be found?

The correct answer is rooted in the framework of environmental legislation that identifies toxic pollutants, specifically focusing on the Clean Water Act. Section 307 of the Clean Water Act outlines a list of toxic pollutants that are subject to regulation under the Act. This section is designed to address the discharge of toxic substances into navigable waters and includes various chemicals known to pose significant risks to human health and the environment.

This identification is essential for establishing standards for discharge and ensuring compliance among industries and municipalities. By specifying toxic pollutants, Section 307 provides a critical regulatory mechanism aimed at protecting water quality and public health.

Other sections mentioned in the options have different focuses: Section 301 primarily addresses the prohibition of unpermitted discharges of pollutants, Section 112 of the Clean Air Act deals with hazardous air pollutants, and Section 261.3 of the RCRA defines what constitutes hazardous waste rather than listing specific toxic pollutants. Thus, the focus of identifying toxic pollutants distinctly aligns with Section 307 of the Clean Water Act.