1 EXHIBIT 23 CONSENT OF INDEPENDENT ACCOUNTANTS We consent to the incorporation by reference in the registration statements of Clean Harbors, Inc. on Form S-8 (Files No. 33-22638, No. 33-51452 and No. 33-60187) of our report dated February 5, 1997 on our audits of the consolidated financial statements and the financial statement schedule of Clean Harbors, Inc., which report is included in Item 8 of this Form 10-K. Coopers & Lybrand L.L.P. Boston, Massachusetts March 27, 1997