Clean Harbors, Inc. ("Clean Harbors") (NYSE:CLH), the leading provider of environmental and industrial services throughout North America, today published its 2026 Sustainability Report, which highlights its efforts to better the environment, protect local communities, and provide responsible corporate governance. Clean Harbors provides customers with safe and compliant environmental solutions and implements its own sustainable business practices that conserve resources and reduce impact. As measured by its Net Climate Benefit factor, Clean Harbors avoided more than twice the greenhouse gas emissions (GHG) generated from its operations in 2025.

The complete Sustainability Report, which highlights the Company’s own sustainability efforts and discloses aspects of its business activities in the context of today’s most important sustainability issues, is available at www.cleanharbors.com/about-us/sustainability.

"Every day Clean Harbors helps North American industry operate more sustainably by recycling valuable resources, treating difficult waste streams, responding to environmental emergencies and providing customers with innovative solutions," said Mike Battles, Co-Chief Executive Officer. "We continue to maximize our efforts to recover and recycle materials that contribute to a more circular economy while helping our customers achieve their own sustainability objectives. Across our network, we are expanding resource recovery capabilities, including our recently launched CleanFuel™ solution and growing E-Waste platform, returning millions of tons and millions of gallons of material back into productive use."

Everywhere industry meets the environment, Clean Harbors is there. In 2025, Clean Harbors recycled more than 250 million combined gallons of used oil and solvents, treated over 90 million gallons of wastewater for its customers, and responded to more than 21,000 emergency response events.

"We continue to be the recognized industry leader in solving the most complex environmental challenges," said Eric Gerstenberg, Co-Chief Executive Officer. "For example, in the past year we achieved a number of milestones related to PFAS and offer our customers an end-to-end solution for the safe management, treatment, and destruction of these dangerous forever chemicals. The total solutions we provide across all our lines of business align with our mission to build a safer and cleaner environment, not only in the communities we serve, but across North America."

About Clean Harbors

Clean Harbors (NYSE:CLH) is North America’s leading provider of environmental and industrial services. The Company serves a diverse customer base, including a majority of Fortune 500 companies. Its customer base spans a number of industries, including chemical, manufacturing and refining, as well as numerous government agencies. These customers rely on Clean Harbors to deliver a broad range of services such as end-to-end hazardous waste management, emergency spill response, industrial cleaning and maintenance, and recycling services. Through its Safety-Kleen subsidiary, Clean Harbors also is a leading provider of parts washers and environmental services to commercial, industrial and automotive customers, as well as North America’s largest re-refiner and recycler of used oil. Founded in 1980 and based in Massachusetts, Clean Harbors operates in the United States, Canada, Mexico, Puerto Rico and India. For more information, visit www.cleanharbors.com.

View source version on businesswire.com: https://www.businesswire.com/news/home/20261013075160/en/

Eric J. Dugas

EVP and Chief Financial Officer

Clean Harbors, Inc.

781.792.5100

InvestorRelations@cleanharbors.com

Jim Buckley

SVP Investor Relations

Clean Harbors, Inc.

781.792.5100

Buckley.James@cleanharbors.com