State regulators agreed June 3 to hold an additional hearing on a key permit for the proposed Line 3 replacement project, a process that is expected to delay construction of the controversial oil pipeline by several months.

The Minnesota Pollution Control Agency announced that a contested case hearing will be held later this summer on a draft water quality permit for the project, in which a state administrative law judge will hear additional evidence on the proposed pipeline’s impacts on wetlands and stream crossings.

The decision to hold the additional hearing pushes back the MPCA’s de...