Markwest Hydrocarbon (MWP) 8-K/A Completion of Acquisition or Disposition of Assets

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-37642) of MarkWest Hydrocarbon, Inc. of our report dated April 15, 2005 relating to the financial statements of Javelina Company (the Partnership), which appears in this Current Report on Form 8-K/A (Amendment No. 1) of MarkWest Hydrocarbon, Inc.

PricewaterhouseCoopers LLP

Houston, Texas

January 17, 2006