Clean Harbors to Report 2Q Results on Aug. 4; Likely to See Jump

Date: July 21, 2010

Source: Clean Harbors, Inc.

Clean Harbors to Announce Second-Quarter 2010 Financial Results on August 4

Clean Harbors, Inc. (CLH) , the leading provider of environmental, energy and industrial services and hazardous waste management services throughout North America, will host its second-quarter 2010 conference call on Wednesday, August 4, 2010 at 9:00 a.m. ET.

On the call, Chairman, President and Chief Executive Officer Alan S. McKim and Executive Vice President and Chief Financial Officer James M. Rutledge will discuss Clean Harbors' financial results, business outlook and growth strategy, as well as provide an update on the Company's involvement in the Gulf oil spill clean-up.

Those who wish to listen to the second-quarter 2010 conference call webcast should visit the Investor Relations section of the Company's website at www.cleanharbors.com. The live call also can be accessed by dialing 877.709.8155 or 201.689.8881 prior to the start of the call. If you are unable to listen to the live call, the webcast will be archived on the Company's website.

About Clean Harbors

Clean Harbors is the leading provider of environmental, energy and industrial services and hazardous waste management services throughout North America. The Company serves over 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 36 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.

For more information, contact:
Clean Harbors, Inc.
James M. Rutledge, 781-792-5100
Executive Vice President and Chief Financial Officer
InvestorRelations@cleanharbors.com.
or
Sharon Merrill Associates, Inc.
Jim Buckley, 617-542-5300
Executive Vice President
clh@investorrelations.com.

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