The U.S. Environmental Protection Agency (EPA) and the U.S. Department of the Army (the agencies) announced a final rule amending the 2023 definition of “waters of the United States” to conform with the recent Supreme Court decision in Sackett v. EPA. The amendments issued are limited and change only parts of the 2023 rule that are invalid under the Sackett v. EPA decision. For example, today’s final rule removes the significant nexus test from consideration when identifying tributaries and other waters as federally protected. The rule will take effect immediately. The agencies will host a public webinar on September 12, 2023 to provide updates on the definition of “waters of the United States.” For registration information, please visit EPA’s webpage for the amendments rule. Learn more about this action on EPA’s “waters of the United States” website.