An official website of the United States government.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Waters of the United States (WOTUS) Rulemaking

Final Rule: Definition of “Waters of the United States” – Addition of Applicability Date to 2015 Clean Water Rule

Please visit “Definition of ‘Waters of the United States’: Rule Status and Litigation Update” for updates regarding the status of this final rule.

The Environmental Protection Agency and U.S. Department of the Army (the agencies) finalized a rule adding an applicability date to the 2015 Rule defining “waters of the United States.” The final rule published in the Federal Register on February 6 , 2018. The 2015 Rule will not be applicable until February 6, 2020. This amendment gives the agencies the time needed to reconsider the definition of “waters of the United States.”

This rule is available on the Government Printing Office's FDsys website and on Regulations.gov in Docket No. EPA-HQ-OW-2017-0644.

The agencies have also prepared a memorandum for the record to provide the public with information about the potential economic impacts associated with this actionThis memorandum, "Consideration of Potential Economic Impacts for the Final Rule: Definition of 'Waters of the United States' – Addition of Applicability Date to 2015 Clean Water Rule," is also available in the docket.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.