EPA Administrator Scott Pruitt June 27 initiated the repeal of an Obama-era water jurisdiction regulation by issuing a proposal that would reinstate prior policies on what waters are subject to federal protections, the agency announced.

The proposed repeal, once in final form, will be the first step the Trump administration takes in a two-step process to undo the 2015 Clean Water Rule, also known as the Waters of the U.S. rule (WOTUS)....