The Mountain Valley Pipeline’s (MVP) planned in-service date has slipped to 2022, and the total cost for the prolonged construction of the project has swelled to around $6.2 billion, management for sponsor Equitrans Midstream Corp. (ETRN) said Tuesday.

Discussing the midstreamer’s 1Q2021 financial results in a conference call with analysts, COO Diana Charletta said the Virginia Department of Environmental Quality and West Virginia Department of Environmental Protection have asked for more time to review MVP’s water quality permit applications.

“We do not believe that we will receive the necessary approvals during the third quarter of 2021, which we previously expected,” Charletta said. “The shift in permit timing now introduces another winter season to navigate,...