On January 23, 2020, the United States Environmental Protection Agency (“EPA”) and the U.S. Army Corps of Engineers issued the Navigable Waters Protection Rule (the “2020 Rule”), which includes a revised definition of the “waters of the United States” subject to federal regulation under the Clean Water Act.[1] The revisions in the 2020 Rule come after a line of U.S. Supreme Court (“Supreme Court”) cases ending with Rapanos v. United States,[2] as well as an Obama-era administrative rule addressing the waterbodies under federal jurisdiction (the “2015 Rule”).[3] Rapanos was the last time the Supreme Court interpreted the term “waters of the United States,” with the intent of curtailing the substantial litigation concerning the meaning of the phrase and defining what “waters of the United States” should be included under federal jurisdiction. The 2015 Rule intended to clarify the definition further and codify the Supreme Court decisions. When effective, the newly issued Navigable Waters Protection Rule will limit the 2015 Rule, attempting again to define what are and what are not “waters of the United States.”
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