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EXHIBIT 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

        We consent to the incorporation by reference in Registration Statement Nos. 33-60187, 333-46159, 333-63662, 333-134381, and 333-134382 on Form S-8 and 333-126205 on Form S-3 of our report dated March 10, 2008 relating to the consolidated financial statements and financial statement schedule of Clean Harbors, Inc. and subsidiaries (the "Company") (which report expresses an unqualified opinion and includes an explanatory paragraph regarding the adoption of FASB Interpretation No. 48, Accounting for Uncertainty in Income Taxes, effective January 1, 2007 and Statement of Financial Accounting Standards No. 123(R), Share-Based Payment, effective January 1, 2006) and of our report dated March 10, 2008 relating to internal control over financial reporting (which expresses an adverse opinion on the effectiveness of the Company's internal control over financial reporting because of a material weakness), appearing in this Annual Report on Form 10-K of Clean Harbors, Inc. for the year ended December 31, 2007.

/s/ DELOITTE & TOUCHE LLP

Boston, Massachusetts
March 10, 2008

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EXHIBIT 23