BASIS OF PRESENTATION

6 Months Ended

Jun. 30, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

BASIS OF PRESENTATION

BASIS OF PRESENTATION

The accompanying consolidated interim financial statements include the accounts of Clean Harbors, Inc. and its subsidiaries (collectively, “Clean Harbors” or the “Company”) and have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) and, in the opinion of management, include all adjustments which are of a normal recurring nature, necessary for a fair presentation of the financial position, results of operations, and cash flows for the periods presented. The results for interim periods are not necessarily indicative of results for the entire year or any other interim periods. The financial statements presented herein should be read in connection with the financial statements included in the Company’s Current Report on Form 8-K filed on July 16, 2012.

During the quarter ended March 31, 2012, the Company re-assigned certain departments among its segments to support management reporting changes. Accordingly, the Company re-allocated shared departmental costs among its segments. The Company has recast the prior year segment information to conform to the current year presentation. See Note 14, “Segment Reporting.”

In preparing the accompanying unaudited consolidated financial statements, the Company has reviewed, as determined necessary by the Company’s management, events that have occurred after June 30, 2012, until the issuance of the financial statements.