Clean Harbors Receives Conservation Award from the U.S. Fish and Wildlife Service

Company Recognized for Restoration of the Sabine National Wildlife

                   Refuge in Southwestern Louisiana

NORWELL, Mass.--(BUSINESS WIRE)--June 29, 2007--Clean Harbors Environmental Services, Inc. ("Clean Harbors")(NASDAQ: CLHB), the leading provider of environmental and hazardous waste management services throughout North America, today announced that it has received the Regional Director's Conservation Award by the U.S. Fish and Wildlife Service, in recognition of the Company's pivotal role in the Southwest Louisiana wildlife recovery effort, following the Gulf coast hurricanes of 2005.

"Hurricanes Katrina and Rita caused significant damage to the National Wildlife Refuges and our facilities throughout southwest Louisiana," said Don Voros, Project Leader of the Southwest Louisiana National Wildlife Refuge Complex. "The scope and complexity of the recovery effort to clean-up the wetlands was unprecedented. Working in conjunction with the U.S. Fish and Wildlife Service, U.S. Environmental Protection Agency, U.S. Coast Guard, and Tennessee Valley Authority, Clean Harbors managed more than 150 specialists and carefully removed more than 12,700 hazardous material items and other debris from 32,000 acres of marsh habitat at the Sabine, Cameron Prairie and Lacassine National Wildlife Refuges."

Using specialized equipment such as marsh draglines, long- and short-reach excavators, marsh buggies, jib crane airboats, pontoon barges, mud boats, sleds, and double- or triple-engine airboats, Clean Harbors crews collected items that ranged from 55-gallon drums to 20,000-gallon oil production tanks and 30,000-gallon oilfield storage tanks. Other items recovered included propane tanks, gas and helium cylinders, and household hazard waste items such as paint cans and cleaning supplies, tires, televisions, computers, refrigerators, washers and dryers. The Company also removed miscellaneous items such as all-terrain vehicles, jet skis, boats, and transformers, which were found scattered throughout the wetlands.

"We are proud to receive this prestigious award from the U.S. Fish and Wildlife Service and to be recognized for our successful execution of the recovery project in the Sabine wetlands," said David M. Parry, Executive Vice President of Sales and Services. "The receipt of the Regional Director's Conservation Award reaffirms Clean Harbors' capacity to undertake the most sensitive and complex projects and underscores our ability to perform even under the most challenging and adverse conditions."

"As a result of Clean Harbors' expertise in managing the clean-up efforts on the ground, the five-member consortium assigned to this project, was able to successfully complete the job both under budget and within a shortened time frame," said Sam Hamilton, Southeast Regional Director, U.S. Fish and Wildlife Service, who presented the award. "It takes extensive planning and specialized equipment to remove debris from sensitive wetland areas devoid of road access, but Clean Harbors managed the process safely and with the least amount of disruption to the wetlands. As a result of Clean Harbors' successful efforts, the Service now can redirect personnel and resources to the next phases of hurricane recovery, and come one step closer to restoring the natural habitats of the Sabine, Cameron Prairie and Lacassine national wildlife refuges."

About Clean Harbors Environmental Services, Inc.

Clean Harbors Environmental Services, 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 175 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.

    CONTACT: Clean Harbors Environmental Services, Inc.
             David N. Proud, 781-792-5490
             Vice President, Marketing
             proudd@cleanharbors.com

    SOURCE: Clean Harbors Environmental Services, Inc.