Clean Harbors to Announce 4Q 2006 Results and Host Conference Call on March 14

Date: February 27, 2007

Source: Clean Harbors, Inc.

Clean Harbors, Inc. (Nasdaq: CLHB), the leading provider of environmental and hazardous waste management services throughout North America, will host its fourth-quarter and year-end 2006 conference call on Wednesday, March 14, 2007 at 9:00 a.m. ET.

On the call, Chairman, President and Chief Executive Officer Alan McKim and Executive Vice President and Chief Financial Officer James M. Rutledge will discuss Clean Harbors' financial results, business outlook and growth strategy.

Those who wish to listen to the fourth-quarter and year-end 2006 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 800.395.0708 or 913. 981.5560 (confirmation code: 2469747) 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, Inc.

Clean Harbors, Inc. is North America's leading provider of environmental and hazardous waste management services. With an unmatched infrastructure of 49 waste management facilities, including nine landfills, six incineration locations and six wastewater treatment centers, the Company provides essential services to over 45,000 customers, including more than 325 Fortune 500 companies, thousands of smaller private entities and numerous federal, state and local governmental agencies. Headquartered in Norwell, Massachusetts, Clean Harbors has more than 100 locations strategically positioned throughout North America in 37 U.S. states, six Canadian provinces, Mexico and Puerto Rico. For more information, visit www.cleanharbors.com.

For more information, contact:
Investor Relations
Clean Harbors, Inc.
781.792.5100

InvestorRelations@cleanharbors.com
Jim Buckley
Executive Vice President
Sharon Merrill Associates, Inc.
617.542.5300
clhb@investorrelations.com.

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