Exhibit 99.1


Press Release


Clean Harbors Reports Fourth-Quarter and

Year-End 2011 Financial Results


·                  Double-Digit Organic Growth and Contributions from Acquisitions Drive Strong Results

·                  Q4 Revenue Increases 31% to $546 Million

·                  Q4 Net Income Up 64%; EBITDA Climbs 38% to $97.4 Million

·                  Company Increases 2012 Guidance


Norwell, MA — February 22, 2012

Clean Harbors, Inc. (“Clean Harbors”) (NYSE: CLH), the leading provider of environmental, energy and industrial services throughout North America, today announced financial results for the fourth quarter and year ended December 31, 2011.


Revenues for the fourth quarter grew 31% to $545.9 million from $417.1 million in the same period in 2010, reflecting a combination of acquisitions and organic growth.  Income from operations in the fourth quarter of 2011 increased 38% to $59.2 million from $43.0 million in the same period of 2010.


All share and per share amounts included in this earnings release reflect the two-for-one stock split completed in July 2011 and have been adjusted retroactively for all periods presented.  Fourth quarter 2011 net income rose 64% to $38.2 million, or $0.72 per diluted share, compared with $23.3 million, or $0.44 per diluted share, in the fourth quarter of 2010.  The effective tax rate in the fourth quarter of 2011 was 21 percent compared to 37 percent in the same period of last year. The provision for income taxes in the fourth quarter of 2011 includes a $6.5 million benefit, or approximately $0.12 per diluted share, due to a favorable release of unrecognized tax benefits.  EBITDA (see description below) increased 38% to $97.4 million in the fourth quarter of 2011 compared with $70.3 million in the same period of 2010.


Comments on the Fourth Quarter


“We concluded an outstanding 2011 with a strong fourth-quarter performance where we again saw the leverage inherent in our business model as we generated a 38% increase in EBITDA on a 31% increase in revenue,” said Alan S. McKim, Chairman and Chief Executive Officer.  “Our growth was driven by a combination of our 2011 acquisitions and double-digit organic growth in the quarter.  We also delivered a 64% increase in net income reflecting our margin improvement initiatives, as well as the favorable tax benefit.”


“All four of our operating segments contributed to our profitable growth in the quarter,” McKim said.  “Within Technical Services, volumes at our facilities were steady with the utilization rate at our incinerators of 91%, while our landfill business generated its strongest quarter of the year.  Within Field Services, a consistent flow of large-scale projects and ongoing maintenance work resulted in 17% year-over-year organic growth, exclusive of emergency response work.  Our Industrial Services segment, which grew more than 50%, benefitted from our recent acquisitions, increased activity in the Oil Sands region and another solid quarter of




42 Longwater Drive · P.O. Box 9149 · Norwell, Massachusetts 02061-9149 · 781.792.5000 · www.cleanharbors.com


The following information was filed by Clean Harbors Inc (CLH) on Wednesday, February 22, 2012 as an 8K 2.02 statement, which is an earnings press release pertaining to results of operations and financial condition. It may be helpful to assess the quality of management by comparing the information in the press release to the information in the accompanying 10-K Annual Report statement of earnings and operation as management may choose to highlight particular information in the press release.

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