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DOW/COE RIN: 0710-AB59 Publication ID: 2026 
Title: Updated Definition of "Waters of the United States" 
Abstract:

The EPA and the Department of the Army are undertaking a rulemaking to revise key topics of the waters of the United States definition in light of the Supreme Court's decision in Sackett v. Environmental Protection Agency, 598 U.S. 651 (2023), including continuous surface connection, relatively permanent, and jurisdictional versus non-jurisdictional ditches. These revisions focus on clarity, simplicity, and improvements that will stand the test of time.  

 

 
Agency: Department of War(DOW)  Priority: Other Significant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: Undetermined  Unfunded Mandates: Undetermined 
EO 14192 Designation: Deregulatory 
CFR Citation: 33 CFR 328   
Legal Authority: 33 U.S.C. 1344    33 U.S.C. 1251   
Legal Deadline:  None

Statement of Need:

The Environmental Protection Agency and the Department of the Army are undertaking a rulemaking to revise key topics of the waters of the United States definition in light of the Supreme Court's decision in Sackett v. Environmental Protection Agency, 598 U.S. 651 (2023), including continuous surface connection, relatively permanent, and jurisdictional versus non-jurisdictional ditches. These revisions focus on clarity, simplicity, and improvements that will stand the test of time.  This action will streamline implementation of Clean Water Act programs by aligning the definition of waters of the United States with Sackett, which significantly narrowed the definition under the Clean Water Act.  

Summary of the Legal Basis:

The Clean Water Act (33 U.S.C. 1251 et seq.)

Alternatives:

The EPA and the Army are evaluating alternatives for this action. 

Anticipated Costs and Benefits:

The EPA and Army are evaluating the anticipated costs and benefits of this action.

Risks:

The EPA and the Army are evaluating the risks associated with this action.

Timetable:
Action Date FR Cite
NPRM  07/00/2026 
Final Action  07/00/2026 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Federal, Local, State, Tribal 
Small Entities Affected: No  Federalism: Undetermined 
Included in the Regulatory Plan: Yes 
RIN Data Printed in the FR: No 
Related Agencies: Joint: EPA/OW; 
Agency Contact:
Elliott Carman
Department of War
108 Army Pentagon, Room 3E419,
Washington, DC 20310-0108
Phone:703 300-2899
Email: elliott.n.carman.civ@army.mil