The document summarizes the key aspects of the US EPA's draft rulemaking on Waters of the U.S. (WOTUS). It defines what bodies of water would be considered WOTUS and thus protected under the Clean Water Act. These include tributaries, adjacent waters, and those with a significant nexus to other jurisdictional waters. It also outlines exclusions like waste treatment systems and some ditches. There is debate over whether the draft rule extends federal jurisdiction beyond current reach, especially regarding water quality regulation of small tributaries. Definitions of important terms like tributary, adjacent, and significant nexus are provided.