New definition of “waters of the United States” takes effect June 22, 2020 everywhere except Colorado under split decisions.

By Janice M. Schneider and Peter R. Viola

In the closely watched battle over the scope of the Clean Water Act (CWA), a federal court in California has denied a motion brought by a coalition of states to stay the Trump Administration’s rule narrowing the law’s reach. However, the federal court in Colorado has enjoined the rule in that state, and litigation in these and other courts will continue — including an anticipated appeal of the California decision to the Ninth Circuit Court of Appeals.