Environmental Alert
(by Lisa Bruderly)
The U.S. Environmental Protection Agency (EPA) and U.S. Army Corps of Engineers (Corps) announced, on September 3, 2021, that they would halt implementation of the current definition of “waters of the United States” (WOTUS) effective immediately and revert back to the pre-2015 definition until further notice. The switch is the result of an August 30, 2021 order from the U.S. District Court for the District of Arizona in the case of Pascua Yaqui Tribe v. U.S. Environmental Protection Agency, which remanded and vacated the definition of WOTUS promulgated by the Trump administration in 2020 (commonly referred to as the Navigable Waters Protection Rule (NWPR)). While there was speculation that the court’s vacatur could be narrowly interpreted to apply only to states where the plaintiffs in the case were located (i.e., Arizona, Minnesota, Washington and Wisconsin), EPA and the Corps have changed the WOTUS definition nationwide.
Importance of the Definition of WOTUS
The definition of WOTUS identifies which waters are federally-regulated under the Clean Water Act (CWA), and, therefore, determines when a federal permit is required for projects that involve dredging or filling of a waterbody (i.e., a Section 404 permit) or the discharge of pollutants into a surface water (i.e., a NPDES permit). The WOTUS definition also affects federal spill reporting and spill prevention planning.
With regard to Section 404 permitting, the more expansive the definition of WOTUS, the more waters that are federally-regulated. The extent of WOTUS impacts caused by a project determines whether an individual or a general Section 404 permit is required, with the process for obtaining an individual permit typically resulting in more Corps involvement, cost and delay.
Significance of the Change in WOTUS Definition
When the Trump administration promulgated the NWPR in 2020, environmental groups criticized and challenged the new WOTUS definition, claiming that it was too narrow and did not federally regulate enough types of waters. …


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