MWP Markwest Hydrocarbon,

MarkWest Hydrocarbon Declares a Quarterly Cash Dividend of $0.025 Per Share DENVER, April 22 /PRNewswire-FirstCall/ -- MarkWest Hydrocarbon, Inc. , today announced that on April 22, 2004 its Board of Directors declared a quarterly cash dividend of $0.025 per share of its common stock for an implied annual rate of $0.10 per share. MarkWest's Board has declared that the dividend is to be paid on May 19, 2004, to the stockholders of record as of the close of business on May 5, 2004. The ex-dividend date is May 3, 2004. The Board announced that its objective is to maintain a regular quarterly dividend, but that any such future declaration will be dependent upon the financial performance of the Company. "MarkWest is pleased to announce this quarterly dividend of $0.025 per share of common stock," stated Frank Semple, President and CEO of MarkWest Hydrocarbon, Inc. "The initiation of a regular dividend speaks to the Board's confidence in the Company's financial strength and future performance." MarkWest Hydrocarbon, Inc. (AMEX:MWP) controls and operates MarkWest Energy Partners, L.P. (AMEX:MWE), a publicly-traded limited partnership engaged in the gathering, processing and transmission of natural gas; the transportation, fractionation and storage of natural gas liquids; and the gathering and transportation of crude oil. We also market natural gas and NGLs. This press release includes "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. All statements other than statements of historical facts included or incorporated herein may constitute forward-looking statements. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we can give no assurance that such expectations will prove to be correct. The forward-looking statements involve risks and uncertainties that affect our operations, financial performance and other factors as discussed in our filings with the Securities and Exchange Commission. Among the factors that could cause results to differ materially are those risks discussed in our Form 10-K for the year ended December 31, 2003. DATASOURCE: MarkWest Hydrocarbon, Inc. CONTACT: Frank Semple, President and CEO, or Andy Schroeder, VP and Treasurer, +1-303-290-8700, , both of MarkWest Hydrocarbon, Inc. Web site: http://www.markwest.com/

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