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MarkWest Houston Gas Plant

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MarkWest Liberty Midstream & Resources, L.L.C. (Markwest) is currently authorized to operate its Houston Gas Plant under Air Quality Plan Approval PA-63-00936F. The Houston Gas Plant is located at 800 Western Avenue in Chartiers Township, Washington County.


On April 27, 2021, DEP received an Air Quality Plan Approval application (PA-63-00936I) from MarkWest that proposes to, among other things, operate the existing facility (currently permitted as a minor source) and make modifications as a Title V facility. This essentially means that MarkWest is requesting that DEP review the application as a major source facility.

On May 25, 2021, DEP issued an administrative incompleteness determination to MarkWest and requested additional information from the applicant within 10 business days.

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