The controversy continues over the hotly contested definition of “waters of the United States” (WOTUS), a phrase that determines the scope of federal jurisdiction over streams, wetlands and other waterbodies under the Clean Water Act (CWA). The U.S. Environmental Protection Agency (USEPA) and the U.S. Army Corps of Engineers (Corps) published a proposed revision to the WOTUS definition on Dec. 7, 2021, (Rule 1), with the public comment period closing on Feb. 7. Nearly 90,000 comments were received.

This proposed definition is similar to the pre-2015 definition of WOTUS, which is currently in effect, but it also includes updates to reflect relevant Supreme Court decisions (e.g., Rapanos v. United States) that occurred in the early 2000s. Much of the controversy surrounding the WOTUS definition relates to the two tests identified in the Rapanos decision. Justice Antonin Scalia issued the plurality opinion in Rapanos, holding that WOTUS would include only “relatively permanent, standing or continuously flowing bodies of water” connected to traditional navigable waters, and to “wetlands with a continuous surface connection to such relatively permanent waters.” Justice Anthony Kennedy, however, advanced a broader interpretation of WOTUS in his concurring opinion, which relied on the concept of a “significant nexus.” In his opinion, Kennedy stated that wetlands should be considered as WOTUS “if the wetlands, either alone or in combination with similarly situated lands in the region, significantly affect the chemical, physical, and biological integrity of other covered water.”

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