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In April 2020, the EPA and the Department of the Army (the agencies”) published the Navigable Waters Protection Rule (NWPR) that revised the previously codified definition of waters of the United States” (85 FR 22250, April 21, 2020). The agencies are now initiating this new rulemaking process that restores the regulations (51 FR 41206) in place prior to the 2015 "Clean Water Rule: Definition of 'Waters of the United States” (80 FR 37054, June 29, 2015), updated to be consistent with relevant Supreme Court decisions. The agencies intend to consider further revisions in a second rule in light of additional stakeholder engagement and implementation considerations, scientific developments, and environmental justice values. This effort will also be informed by the experience of implementing the pre-2015 rule, the 2015 Clean Water Rule, and the 2020 Navigable Waters Protection Rule.