EXHIBIT 23 Consent of Independent Accountants We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (No. 333-20829) and (No. 333-20833) of MarkWest Hydrocarbon, Inc. of our report dated March 5, 1997 appearing on page 23 of this Form 10-K. PRICE WATERHOUSE LLP Denver, Colorado March 5, 1997