Clean Harbors to Present at the Oppenheimer 6th Annual Industrials Conference

Presentation to be Webcast Live at 1:25 p.m. (ET) Monday, September 26

Norwell, MA – September 13, 2011 – Clean Harbors, Inc. (“Clean Harbors”) (NYSE: CLH), the leading provider of environmental, energy and industrial services throughout North America, today announced that Chairman and Chief Executive Officer Alan S. McKim and David M. Parry, President, Energy & Industrial Services, will be presenting at the Oppenheimer 6th Annual Industrials Conference in New York City. Clean Harbors’ presentation will take place at 1:25 p.m. (ET) on Monday September 26, and will be webcast live. To access the live or archived webcast, visit the “Investor Relations” portion of Clean Harbors’ website at www.cleanharbors.com.

About Clean Harbors

Clean Harbors is the leading provider of environmental, energy and industrial services throughout North America. The Company serves more than 50,000 customers, including a majority of the Fortune 500 companies, thousands of smaller private entities and numerous federal, state, provincial and local governmental agencies.

Headquartered in Norwell, Massachusetts, Clean Harbors has more than 175 locations, including over 50 waste management facilities, throughout North America in 37 U.S. states, seven Canadian provinces, Mexico and Puerto Rico. The Company also operates international locations in Bulgaria, China, Singapore, Sweden, Thailand and the United Kingdom. For more information, visit www.cleanharbors.com.

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