Dave Ross and Anna Wildeman provide high-level reactions to the Supreme Court’s oral arguments in the Sackett v. EPA case, the latest legal battle in a long-running dispute over the meaning of the phrase “waters of the United States” under the Clean Water Act. They discuss the Court’s surprising focus on a little-known parenthetical in the section 404 program, EPA’s potential reactions to the arguments, and whether anyone can reasonably predict the outcome of the case in what may be the most closely watched environmental decision of the current term.