The purpose of this guidance is to provide specific information for States and Regions on interpretation of the statutory requirements of Section 304(1) of the Clean Water Act (CWA), as amended, and to place the new requirements in the context of the ongoing nationwide programs for controlling toxic pollutants and toxicity. Section 304(1) of the CWA requires States to develop lists of impaired waters, identify point sources and amounts of pollutants they discharge that cause toxic impacts, and individual control strategies for each such point source. These individual control strategies are designed to ensure that applicable water quality standards are achieved by no later than June 1992. Controls for these pollutants must be established as soon as possible but no later than the statutory time frames set forth in Section 304(1).