A district court dismissed a Native American tribe's lawsuit challenging a proposed sulfide mine along the banks of the Menominee River, which forms the border between Wisconsin and Michigan's Upper Peninsula. The tribe argued, pursuant to the Act's citizen suit provision, that EPA and the U.S. Army...

The Fourth Circuit vacated the U.S. Army Corps of Engineers' verification that construction of a natural gas pipeline could proceed in West Virginia under the terms and conditions of CWA Nationwide Permit (NWP) 12. Environmental groups argued that the Corps improperly incorporated the state's condit...

A district court vacated nationwide the Applicability Date Rule, which suspended the effect of the Clean Water Rule until February 2020 and required agencies in the interim to apply the pre-Clean Water Rule definition of "waters of the United States." Environmental groups argued that EPA and the U.S...

A district court dismissed a challenge to EPA's amendment to the 2015 Effluent Limitations Guidelines Rule, which established new limits and standards for various types of waste streams discharged by steam electric power plants. Environmental groups argued that the amendment violated the ESA and NEP...

A district court ordered EPA to issue a temperature total maximum daily load (TMDL) under the CWA for the Columbia and Snake Rivers, which are native habitat for endangered and threatened salmon and steelhead populations. An environmental group argued that the Agency failed to issue a TMDL for the r...