In 2015, the Environmental Protection Agency and the Department of the Army (the agencies) published the "Clean Water Rule: Definition of 'Waters of the United States," (80 FR 37054, June 29, 2015). On February 28, 2017, the President issued an Executive Order 13778 titled "Restoring the Rule of Law, Federalism, and Economic Growth by Reviewing the 'Waters of the United States' Rule," which instructed the agencies to review the 2015 rule and rescind or replace it as appropriate and consistent with law. The agencies published the proposed rule on February 14, 2019, as a second step in a comprehensive, two-step process to revise the definition of "waters of the United States" consistent with Executive Order 13778. In this second step, the agencies are conducting a substantive re-evaluation and revision of the definition of "waters of the United States" in accordance with the Executive Order. The agencies plan to finalize the revised definition after reviewing public comments on the proposal.