November 5, 2018 Kirk R. Oliver Chief Financial Officer Equitrans Midstream Corp 625 Liberty Avenue, Suite 2000 Pittsburgh, PA 15222 Re: Equitrans Midstream Corp Registration Statement on Form S-1 Filed November 2, 2018 File No. 333-228129 Dear Mr. Oliver: This is to advise you that we have not reviewed and will not review your registration statement. Please refer to Rules 460 and 461 regarding requests for acceleration. We remind you that the company and its management are responsible for the accuracy and adequacy of their disclosures, notwithstanding any review, comments, action or absence of action by the staff. Please contact Jacqueline Kaufman, Staff Attorney, at 202-551-3797 with any questions. Sincerely, Division of Corporation Finance Office of Consumer Products