Mail Stop 3561
                                                           October 12, 2018

Robert J. McNally
President
Equitrans Midstream Corporation
2200 Energy Drive
Canonsburg, PA 15317

       Re:     Equitrans Midstream Corporation
               Amendment No. 1 to Registration Statement on Form 10-12B
               Filed September 25, 2018
               File No. 1-38629

Dear Mr. McNally:

       We have reviewed your filing and have the following comments. In some of
our
comments, we may ask you to provide us with information so we may better
understand your
disclosure.

       Please respond to these comments within ten business days by providing
the
requested information or advise us as soon as possible when you will respond.
If you do not
believe our comments apply to your facts and circumstances, please tell us why
in your
response.

     After reviewing your response to these comments, we may have additional
comments.

Exhibit 99.1

Questions and Answers about the Separation and Distribution, page 1

   1. We partially reissue comment 2. Here or in your Summary, please disclose
the
      amount of the distribution and cash settlement to be paid to EQT and how
you arrived
      at the amount of the distribution.

       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.
 Robert J. McNally
Equitrans Midstream Corporation
October 12, 2018
Page 2




       You may contact Scott Stringer, Staff Accountant, at (202) 551-3272 or
Bill
Thompson, Accounting Branch Chief, at (202) 551-3344 if you have questions
regarding
comments on the financial statements and related matters. Please contact
Jacqueline
Kaufman, Staff Attorney, at (202) 551-3797 or me at (202) 551-3720 with any
other
questions.


                                                        Sincerely,

                                                        /s/ Mara L. Ransom

                                                        Mara L. Ransom
                                                        Assistant Director
                                                        Office of Consumer
Products