On January 18, 2023, the Environmental Protection Agency (“EPA”) and the U.S. Army Corps of Engineers (collectively, the “Agencies”) published a final rule re-defining the term “waters of the United States”) (“WOTUS”) under the Clean Water Act (“Final Rule”). The Final Rule will become effective March 20, 2023.
The Final Rule reverses many of the regulatory changes during the Trump Administration which narrowed the scope of waterbodies subject to regulation under the Clean Water Act (“CWA”). In an effort to reach a “durable” WOTUS definition, the Final Rule adopted both the “relatively permanent” and “significant nexus” standards from the Rapanos v. United States case, and directs the Agencies to interpret “waters of the United States” to include:
- Traditional navigable waters, the territorial seas, and interstate waters;
- Impoundments of “waters of the United States”;
- “Jurisdictional tributaries”;
- “Jurisdictional adjacent wetlands”; and
- Intrastate lakes and ponds, streams, or wetlands not identified as traditional navigable waters, territorial seas, interstate waters, impoundments, jurisdictional tributaries, or jurisdictional adjacent wetlands that meet either the relatively permanent standard or the significant nexus standard.
The Final Rule also codifies several exclusions from the WOTUS definition, such as waste treatment systems, prior converted cropland, artificially irrigated areas, and artificial lakes or ponds. More information about the Final Rule is in our recent alert.
As with the Obama-era and Trump-era rulemaking efforts, the Final Rule is already facing legal challenges in State of Texas, et al. v. U.S. EPA and American Farm Bureau Federation, et al. v. U.S. EPA, both of which were filed the same day the Agencies published the Final Rule. The U.S. Supreme Court is expected to issue an opinion in United States v. Sackett in 2023, which will inform the outcome of challenges to the Final Rule.