EPA to Revise or Replace Trump-Era Clean Water Act Rules, But Will Leave Existing Rules In Place For Now

The US Environmental Protection Agency (“EPA”), under Administrator Michael Regan, has begun the process of reviewing and revising two key Clean Water Act (“CWA”) rules: The Navigable Waters Protection Rule and the CWA Section 401 Certification Rule. In recent court filings in cases where litigants have challenged both of these Trump-era rules, EPA has requested those cases be remanded because EPA has commenced new rulemaking processes that will revise or replace the challenged rules. However, if the courts grant EPA’s requests, EPA has requested that the existing rules remain in effect until EPA finalizes replacement rules through the formal notice and comment rulemaking process.

The first of the two key CWA rules at issue is the Navigable Waters Protection Rule, which defines “Waters of the United States”. This is a significant rule and definition because the jurisdiction of the CWA is limited to Waters of the United States. Thus, by setting the definition of Waters of the United States, EPA establishes the reach of the CWA. Due to the significance of this definition, it has been widely contested throughout the years and every attempt by EPA and the US Army Corps of Engineers to promulgate a definition has faced legal challenges.  

In 2019, the Trump Administration rescinded the Obama-era Waters of the United States rule and in 2020, issued the Navigable Waters Protection Rule, narrowing the definition of Waters of the United States. The most significant change in the Trump rule is that the new definition excludes ephemeral waters (those flowing only in direct response to precipitation) and many wetlands that are near other jurisdictional waters but lack a physical or surface connection to them.

In several court filings in June, EPA has stated its plans “to commence a new rulemaking to revise or replace the [Navigable Waters Protection] rule.” Notably, EPA is not requesting vacatur of the existing rule during the rulemaking process.

The second CWA rule facing a similar fate is the CWA Section 401 Certification Rule. Under the CWA, a federal agency may not issue a permit or license for an activity that may result in a discharge into a Water of the United States unless a Section 401 Certification has been issued verifying compliance with water quality requirements. States and authorized tribes are generally responsible for issuing Section 401 Certifications, and they are required to act on a Section 401 Certification request “within a reasonable period of time (which shall not to exceed one year) after receipt” of such a request. 33 U.S.C. § 1341(a)(1).

The Trump EPA issued the final CWA Section 401 Certification Rule on July 13, 2020, with the goal of expediting infrastructure permitting by making the 401 Certification process quicker. The biggest changes made by this rule were limiting the scope of state and tribal certification review and limiting the imposition of conditions in the certifications. Just as with the Navigable Waters Protection Rule, EPA has now indicated in court filings (and on its website) that the Section 401 Certification Rule is under review and will be revised or revoked, but also will not be vacated in the interim.

EPA has a lot of work ahead to propose new versions of these rules for public review and comment. Promulgation of final rules will therefore be many months, if not more than a year away. In the meantime, environmental groups and other challengers have indicated they will continue to challenge the Trump-era rules still in effect. The Corporate Environmental Lawyer blog will keep a close watch and report on all key developments.

© 2026 Jenner & Block LLP. Attorney Advertising. Jenner & Block LLP is an Illinois Limited Liability Partnership including professional corporations. This publication, presentation, or event is not intended to provide legal advice but to provide information on legal matters and/or firm news of interest to our clients and colleagues. Readers or attendees should seek specific legal advice before taking any action with respect to matters mentioned in this publication or at this event. The attorney responsible for this communication is Brent E. Kidwell, Jenner & Block LLP, 353 N. Clark Street, Chicago, IL 60654-3456. Prior results do not guarantee a similar outcome. Jenner & Block London LLP, an affiliate of Jenner & Block LLP, is a limited liability partnership established under the laws of the State of Delaware, USA and is authorised and regulated by the Solicitors Regulation Authority with SRA number 615729. Information regarding the data we collect and the rights you have over your data can be found in our Privacy Notice. For further inquiries, please contact dataprotection@jenner.com.

EPA to Revise or Replace Trump-Era Clean Water Act Rules, But Will Leave Existing Rules In Place For Now

The US Environmental Protection Agency (“EPA”), under Administrator Michael Regan, has begun the process of reviewing and revising two key Clean Water Act (“CWA”) rules: The Navigable Waters Protection Rule and the CWA Section 401 Certification Rule. In recent court filings in cases where litigants have challenged both of these Trump-era rules, EPA has requested those cases be remanded because EPA has commenced new rulemaking processes that will revise or replace the challenged rules. However, if the courts grant EPA’s requests, EPA has requested that the existing rules remain in effect until EPA finalizes replacement rules through the formal notice and comment rulemaking process.

The first of the two key CWA rules at issue is the Navigable Waters Protection Rule, which defines “Waters of the United States”. This is a significant rule and definition because the jurisdiction of the CWA is limited to Waters of the United States. Thus, by setting the definition of Waters of the United States, EPA establishes the reach of the CWA. Due to the significance of this definition, it has been widely contested throughout the years and every attempt by EPA and the US Army Corps of Engineers to promulgate a definition has faced legal challenges.  

In 2019, the Trump Administration rescinded the Obama-era Waters of the United States rule and in 2020, issued the Navigable Waters Protection Rule, narrowing the definition of Waters of the United States. The most significant change in the Trump rule is that the new definition excludes ephemeral waters (those flowing only in direct response to precipitation) and many wetlands that are near other jurisdictional waters but lack a physical or surface connection to them.

In several court filings in June, EPA has stated its plans “to commence a new rulemaking to revise or replace the [Navigable Waters Protection] rule.” Notably, EPA is not requesting vacatur of the existing rule during the rulemaking process.

The second CWA rule facing a similar fate is the CWA Section 401 Certification Rule. Under the CWA, a federal agency may not issue a permit or license for an activity that may result in a discharge into a Water of the United States unless a Section 401 Certification has been issued verifying compliance with water quality requirements. States and authorized tribes are generally responsible for issuing Section 401 Certifications, and they are required to act on a Section 401 Certification request “within a reasonable period of time (which shall not to exceed one year) after receipt” of such a request. 33 U.S.C. § 1341(a)(1).

The Trump EPA issued the final CWA Section 401 Certification Rule on July 13, 2020, with the goal of expediting infrastructure permitting by making the 401 Certification process quicker. The biggest changes made by this rule were limiting the scope of state and tribal certification review and limiting the imposition of conditions in the certifications. Just as with the Navigable Waters Protection Rule, EPA has now indicated in court filings (and on its website) that the Section 401 Certification Rule is under review and will be revised or revoked, but also will not be vacated in the interim.

EPA has a lot of work ahead to propose new versions of these rules for public review and comment. Promulgation of final rules will therefore be many months, if not more than a year away. In the meantime, environmental groups and other challengers have indicated they will continue to challenge the Trump-era rules still in effect. The Corporate Environmental Lawyer blog will keep a close watch and report on all key developments.

© 2026 Jenner & Block LLP. Attorney Advertising. Jenner & Block LLP is an Illinois Limited Liability Partnership including professional corporations. This publication, presentation, or event is not intended to provide legal advice but to provide information on legal matters and/or firm news of interest to our clients and colleagues. Readers or attendees should seek specific legal advice before taking any action with respect to matters mentioned in this publication or at this event. The attorney responsible for this communication is Brent E. Kidwell, Jenner & Block LLP, 353 N. Clark Street, Chicago, IL 60654-3456. Prior results do not guarantee a similar outcome. Jenner & Block London LLP, an affiliate of Jenner & Block LLP, is a limited liability partnership established under the laws of the State of Delaware, USA and is authorised and regulated by the Solicitors Regulation Authority with SRA number 615729. Information regarding the data we collect and the rights you have over your data can be found in our Privacy Notice. For further inquiries, please contact dataprotection@jenner.com.

News and Insights

Event

Amanda Shafer Berman to Speak on Energy and Administrative Law at WEN-DC Webinar

As the Supreme Court's new Term begins, Jenner & Block Partner Amanda Shafer Berman will join a Women's Energy Network of Washington, DC (WEN-DC) webinar on how the Court's decisions are shaping the energy sector.

October 14, 2026

Publications

Partner Amanda Shafer Berman Quoted in Bloomberg Law on Senate Permitting Overhaul Bill

Partner Amanda Shafer Berman was quoted in an October 5 Bloomberg Law article, "Permitting Deal Gives Projects Defense Against Litigation Delays," on the Senate's new permitting overhaul package and its expected impact on litigation over federal permitting reversals.

October 2026

Event

Partner John Storino to Speak at Sandpiper Partners' “AI and Outside Counsel Guidelines Roundtable”

On October 8, Partner John Storino will serve as a panelist at the “AI and Outside Counsel Guidelines Roundtable,” hosted by Sandpiper Partners in Chicago.

October 8, 2026

Event

Partner Meghan Greenfield to Speak on Supreme Court Climate Case at Edison Electric Institute's Fall Legal Conference

On Wednesday, October 7, Partner Meghan Greenfield will speak on a panel titled "Boulder County v. Suncor Energy: What the Supreme Court's Climate Case Means for the Energy Industry" at the Edison Electric Institute's Fall Legal Conference in Salt Lake City, Utah.

October 7, 2026

Publications

The Form Rules Everything: A Seventh Circuit Ruling on ERISA's Substantial Compliance Doctrine

Partner Joseph Torres and Special Counsel Jennifer Beach authored an article for Employee Relations Law Journal examining the Seventh Circuit's decision in Packaging Corp. of America Thrift Plan for Hourly Employees v. Langdon, a ruling that addresses both the standard of review in ERISA interpleader actions and the continued viability of the substantial compliance doctrine for changing plan beneficiaries.

October 5, 2026