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Clean Harbors

Clean Harbors, Inc. (NYSE: CLH) is North America's leading provider of environmental and industrial services, specializing in the management, transportation, disposal, and of hazardous and non-hazardous materials. Founded in 1980 as a small cleaning business by Alan S. McKim, who serves as its Executive Chairman and , the company has grown into a publicly traded corporation headquartered in , operating approximately 900 service locations and over 100 facilities across the , , , and other regions. The company's core offerings include emergency spill response, industrial cleaning and maintenance, laboratory chemical packing via its proprietary CleanPack® system introduced in 1986, and used oil re-refining through its Safety-Kleen subsidiary, which produces around 150 million gallons of annually. Clean Harbors serves a diverse base that encompasses a majority of companies, chemical and industries, agencies, and small quantity generators, with two primary reporting segments: Environmental Services and Safety-Kleen Sustainability Solutions. Through strategic acquisitions, such as the 2002 purchase of Safety-Kleen's Chemical Services Division, the 2012 full acquisition of Safety-Kleen, the 2018 integration of Veolia's U.S. industrial cleaning business, and the 2024 acquisition of HEPACO, Clean Harbors has expanded its capabilities and footprint, establishing itself as the continent's largest disposal company. This growth has positioned the firm to address complex environmental challenges, including and initiatives, while maintaining a commitment to safety and innovation in industrial services. In 2025, the company issued its Sustainability Supplement, achieving its 2030 recycling goal ahead of schedule.

Overview

Company profile

Clean Harbors, Inc. was founded in 1980 by Alan S. McKim as a small tank cleaning business and has grown into North America's leading provider of environmental and industrial services. The company is headquartered in , and operates across the , , , , and , serving a diverse range of clients in industries such as , and . With approximately 25,000 employees as of 2025, Clean Harbors is publicly traded on the under the ticker symbol CLH, having completed its in 1987. The company specializes in comprehensive solutions including management, emergency response, and industrial cleaning services, addressing complex environmental challenges for commercial and industrial customers. Clean Harbors structures its operations into two primary reporting segments: Environmental Services, which focuses on and related activities, and Safety-Kleen, which provides solutions centered on recovery and re-refining. This framework enables the company to deliver integrated services while maintaining a strong emphasis on , compliance, and across its global footprint.

Leadership

Clean Harbors underwent a significant transition in 2023, marking the end of founder Alan S. McKim's tenure as CEO, a role he held from the company's inception in 1980 until March 2023. As part of this planned succession, McKim transitioned to Executive Chairman and , continuing to guide the company's strategic direction and innovation efforts. McKim, who founded Clean Harbors with a focus on environmental services, has historically maintained a substantial ownership stake of approximately 60%, though this has been reduced over time through share sales and company growth; as of mid-2025, his ownership stood at about 4.7% of outstanding shares. In conjunction with McKim's transition, Clean Harbors appointed Michael L. Battles and Eric W. Gerstenberg as Co-Chief Executive Officers and Co-Presidents, effective March 31, 2023. Battles, who joined the company in 2013 as Senior Vice President, Corporate Controller, and Chief Accounting Officer, had served as Executive Vice President and since 2016 prior to his promotion. Gerstenberg, with the company since 2005, was previously for eight years, overseeing operational aspects of environmental and industrial services. This co-CEO structure was designed to leverage their complementary expertise in finance and operations to drive continued growth. Eric Dugas succeeded Battles as Executive Vice President and , also effective March 31, 2023. Dugas brought extensive financial leadership experience from prior roles at other public companies to manage Clean Harbors' fiscal strategy and reporting. The company's comprises 13 members as of September 2024, including McKim as Chairman, with a focus on independent oversight. Edward G. Galante serves as Lead , a position he assumed following his election to the board in ; his background includes over 30 years at Exxon Mobil Corporation, providing expertise in and . In September 2024, Battles and Gerstenberg were added as Class III directors, whose terms expire at the 2025 annual meeting, enhancing alignment between executive leadership and board responsibilities.

Business operations

Environmental Services

The Environmental Services segment of Clean Harbors represents the company's core operations, providing vertically integrated management of hazardous and non-hazardous waste materials across . This includes the collection, transportation, treatment, recycling, and disposal of such materials at specialized facilities, forming the foundation of the company's service offerings. The segment accounts for the majority of Clean Harbors' overall revenue, driven by its comprehensive approach to waste handling that minimizes environmental impact while meeting regulatory requirements. Key services within the segment encompass emergency response for spill cleanup and , industrial cleaning and such as high-pressure water jetting and hydro excavation, and technical services including laboratory analysis and compliance consulting. These capabilities enable rapid mobilization for incidents like chemical releases or , as well as routine for complex industrial sites. For instance, the segment supports responses on land or water, leveraging decades of expertise to contain and remediate contaminants efficiently. Industrial cleaning services are applied in scenarios like turnarounds, where high-pressure cleaning removes residues from vessels and pipelines to ensure safe operations. Clean Harbors maintains an extensive network of operational assets to support these services, including more than 100 waste disposal facilities such as incinerators, landfills, and plants, alongside approximately 900 service locations for field operations. The company also operates a fleet of specialized vehicles designed for safe transport of hazardous materials, enhancing responsiveness and compliance. The primary customer base spans the energy, chemical, manufacturing, and government sectors, with services tailored to large-scale generators of , including companies and public agencies. Recent expansions have strengthened the segment's industrial capabilities through the 2021 acquisition and integration of HydroChemPSC, a leading provider of industrial cleaning and specialty maintenance services, acquired for $1.25 billion in cash, and the 2024 acquisition of HEPACO for $400 million, which enhanced emergency response and field services, contributing to significant revenue growth in these areas. This integration has expanded Clean Harbors' expertise in areas like chemical cleaning and utility services, allowing for more seamless delivery of solutions to and clients.

Safety-Kleen Sustainability Solutions

The Safety-Kleen Sustainability Solutions segment of Clean Harbors specializes in services that emphasize and , transforming industrial waste streams into valuable products to minimize environmental impact. This segment traces its origins to Clean Harbors' acquisition of Safety-Kleen's Chemical Services Division, which integrated a robust network for handling used oils and solvents into the company's operations. Through its OilPlus® program, Safety-Kleen implements closed-loop processes that collect, re-refine, and redistribute materials, supporting customers in achieving objectives while complying with regulatory requirements for . Key services within this segment include used oil collection and re-refining, where Safety-Kleen gathers spent motor and oils from various sources and processes them into high-quality base lubricants, such as Group II+ KLEEN+™ oils that offer performance comparable to virgin stocks. Parts washer management involves the of cleaning solvents used in automotive and applications, with thousands of units refurbished annually to extend equipment life and recover reusable fluids. Additional environmental services encompass , which recovers for reuse, and processing, which crushes and separates metals and absorbents to prevent disposal. Operational assets supporting these activities include over 200 Safety-Kleen service centers across , a network of nine re-refineries—such as the world's largest facility in —and an extensive collection system utilizing trucks, tankers, railcars, and barges. This infrastructure enables the segment to serve more than 300,000 customers annually, facilitating efficient on-site waste handling through proprietary environmental services tailored to specific needs. The network was expanded in 2024 through the acquisition of Noble Oil Services, adding a re-refinery in the . The sustainability emphasis of Safety-Kleen's operations is evident in its processing of 253 million gallons of used in 2024, yielding 249 million gallons of re-refined products that reduce by up to 76% compared to traditional virgin production. These efforts divert substantial from landfills—such as over 500 tons of from parts washer refurbishments—and contributed to 1.9 million metric tons of in 2024, achieving the company's 2030 goal ahead of schedule. The primary customer base comprises automotive repair shops, manufacturers, and fleet operators, who benefit from these services to manage streams responsibly and close loops in their operations.

History

Founding and early years

Clean Harbors was founded on March 24, 1980, by Alan McKim in , initially operating as a four-person tank cleaning business with a single truck, focused on servicing clients by removing hazardous residues from oil tanks. This venture emerged in the wake of heightened environmental awareness and regulations following the 1978 disaster, which exposed groundwater contamination from chemical waste and spurred the passage of the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) in December 1980, emphasizing proper handling and transportation. The company's early operations centered on transportation and cleanup of hazardous materials, capitalizing on the growing demand for compliant services amid stricter federal oversight. By the mid-1980s, Clean Harbors had achieved significant initial growth, with revenues exceeding $1 million in and reaching $4.2 million by , supported by a workforce of 34 employees. A notable early milestone came in 1984 when the company responded to the grounding of the tanker Eldia off , successfully pumping more than 100,000 gallons of oil from the vessel to avert a spill, demonstrating its emerging expertise in emergency environmental services. In November 1987, Clean Harbors went public via an on , selling 1 million shares at $9 each to raise approximately $9 million, with the stock symbol CLH; the shares traded above $15 shortly after, and the listing later transferred to the . This IPO provided capital for expansion and solidified the company's position in the burgeoning sector. The late 1980s marked key expansions that transitioned Clean Harbors from primarily transportation services to a comprehensive waste disposal provider, including the 1986 introduction of its proprietary CleanPack® system for laboratory chemical packing and the 1989 acquisition of Chem Clear Inc., a specialist in industrial aqueous , which enhanced its treatment capabilities. Throughout the , the company grew its and operations to address evolving regulatory demands, such as the 1984 amendments to the (RCRA), which imposed stricter standards for facilities. Milestones included acquiring a state-of-the-art incinerator in , in 1995. Later in the , it purchased facilities in , , , and , enabling the company to process and "de-list" treated ash for safer disposal; by the mid-1990s, it operated five incinerators and nine landfills nationwide. Early challenges included navigating complex environmental compliance and liabilities under RCRA and CERCLA, with the company facing a 1991 permit denial for a proposed incinerator in due to local community opposition and regulatory hurdles. Additionally, Clean Harbors assumed Superfund-related remediation responsibilities at various sites inherited through acquisitions and operations, requiring ongoing assessments and cost provisions for cleanup under federal mandates established in the early 1980s. These obstacles tested the company's resilience but ultimately reinforced its foundational model of integrated hazardous waste management.

Expansion through acquisitions

Clean Harbors' expansion strategy post-2000 heavily relied on to scale operations and diversify offerings. A pivotal early deal was the acquisition of Safety-Kleen's Chemical Services Division, which included 55 service centers and 33 facilities across , purchased for $46.3 million in cash plus the assumption of approximately $265 million in environmental liabilities. This transaction tripled the company's size at the time and marked its initial foray into waste recycling and broader chemical services, integrating assets that enhanced treatment and disposal capabilities. In 2006, Clean Harbors acquired Teris, LLC, adding an incineration facility in El Dorado, Arkansas, several field locations, and 550 employees, which bolstered its disposal and field services capabilities. Subsequent acquisitions built on this foundation with targeted purchases that bolstered specific service lines. In 2009, the company acquired Eveready Inc. for approximately $387 million, expanding its presence in Canada with 79 service locations, over 2,100 employees, and a fleet of more than 2,400 vehicles. In 2011, Clean Harbors acquired Peak Energy Services for approximately CAD $202 million, adding specialized oilfield services, including surface rentals and drilling support, primarily in Western Canada. In 2012, Clean Harbors acquired the entirety of Safety-Kleen for $1.25 billion in cash, significantly expanding its waste treatment, recycling, and environmental services portfolio through integration of complementary operations. In 2013, the company acquired Evergreen Oil, a California-based waste oil collector and re-refinery, for $60 million, strengthening its used oil recycling infrastructure on the West Coast. The 2017 acquisition of Lonestar West for CAD $44 million introduced advanced hydro excavation services and extended operations into the Canadian market. In 2018, Clean Harbors acquired Veolia North America's U.S. industrial cleaning business for $120 million, enhancing its scale and capabilities in industrial services. The 2021 acquisition of HydroChemPSC for $1.25 billion in cash broadened industrial cleaning and specialty maintenance capabilities across the U.S. Finally, in 2024, Clean Harbors acquired HEPACO for $400 million in cash, enhancing its emergency response and environmental remediation services in the Eastern United States. By 2025, the company had completed at least 11 such acquisitions since 2000. These deals strategically diversified Clean Harbors' service offerings—from and to emergency response and oilfield support—while expanding its geographic footprint, notably into via Eveready and Lonestar West. The HydroChemPSC acquisition, for instance, created opportunities and improved margins in the industrial services segment by integrating complementary field operations. The acquisition further strengthened scale. Overall, the acquisitions drove service integration and without relying solely on . Financing for these expansions typically involved cash payments supported by debt and equity raises. For example, the 2024 HEPACO deal was funded through proceeds from a $500 million senior notes issuance maturing in 2031, reflecting Clean Harbors' approach to leveraging capital markets for bolt-on growth. Earlier transactions, such as , were similarly executed with all-cash considerations drawn from existing liquidity and borrowings.

Regulatory and environmental impact

Compliance history

Clean Harbors has faced multiple enforcement actions from the U.S. Environmental Protection Agency (EPA) for violations of the (RCRA), which regulates management. In February 2024, the EPA fined Clean Harbors Environmental Services Inc. $270,412 for improper storage and management of at its , incineration facility, stemming from operational backlogs between 2021 and 2023 that led to non-compliance with RCRA storage time limits. Earlier, in July 2007, the EPA issued an administrative order requiring Clean Harbors to immediately address imminent hazards at its , facility, including risks from leaking tanks and inadequate containment systems, mandating corrective actions within three days to prevent threats to human health and the . Beyond U.S. federal actions, Clean Harbors has encountered regulatory penalties internationally. In April 2025, Clean Harbors Inc. was fined $100,000 by an court for violating the Environmental Protection Act, specifically for failing to conduct required geotechnical monitoring during the excavation of a waste-holding at its facility, in non-compliance with a ministry approval. In , the U.S. Department of Justice filed a complaint in August 2024 against Clean Harbors Inc. and related entities as successors to Rollins Environmental Services, alleging improper handling and disposal of at the Devil's Swamp Lake site near Baton Rouge, leading to a proposed for cleanup and penalties exceeding $5 million. The company has been involved in several legal disputes related to workplace and environmental compliance. From 2019 to 2025, Clean Harbors faced OSHA-related challenges, including citations for safety violations and whistleblower protections, though specific litigation outcomes varied by case. For example, in July 2025, the Occupational Safety and Health Administration (OSHA) cited Clean Harbors Environmental Services Inc. for three willful violations following a January 10, 2025, worker fatality at its Twinsburg, Ohio, facility, where an employee entered a rail tank car without proper ventilation or atmospheric testing, resulting in exposure to hazardous fumes and proposed penalties of $602,938. In November 2024, a California Superior Court issued a final judgment against Clean Harbors Wilmington LLC for hazardous waste mismanagement violations under the Hazardous Waste Control Law and its DTSC permit, resulting in civil penalties and an injunction for corrective measures at the facility. A pattern of repeated issues has emerged, particularly with incinerator operations and permitting. For instance, in 2018, local residents and environmental groups in , opposed Clean Harbors' application to expand hazardous waste burning at its facility, citing concerns over increased emissions and health risks, which delayed permit approvals and highlighted ongoing community and regulatory scrutiny. In July 2025, the EPA reached a with Clean Harbors under the , involving ten facilities across eight states to address compliance violations and establish proper industry standards. Additionally, in March 2025, the Department of issued an enforcement notice to Clean Harbors, providing an opportunity for a hearing on alleged violations. Over recent years, these incidents have resulted in total fines exceeding $1 million across multiple jurisdictions, underscoring persistent challenges in waste handling and facility operations. In response to these enforcement actions, Clean Harbors has pursued facility upgrades, such as enhanced waste storage systems and monitoring protocols, and entered into settlements to resolve violations, including commitments to . However, the EPA has noted the company's "lengthy history" of non-compliance with laws like RCRA, indicating that while are implemented, regulatory oversight remains intensive.

Sustainability initiatives

Clean Harbors maintains a comprehensive framework aligned with standards from the (SASB), (GRI), and (IFRS), overseen by its and Committee to guide , , and practices. The company's 2025 Sustainability Supplement highlights its commitment to zero-waste objectives, including achieving a 25% increase in volumes from a 2019 baseline six years ahead of the 2030 target, with 1.9 million metric tons of materials recycled in 2024. This progress supports broader efforts to minimize use and promote principles across operations. Key sustainability programs emphasize resource recovery and emissions mitigation through re-refining processes. Safety-Kleen, a Clean Harbors subsidiary, operates as North America's largest re-refiner of used oil, processing 253 million gallons in 2024 to produce 249 million gallons of high-quality , avoiding 2.36 million tons of CO2 equivalent emissions in the process. The company has consistently collected over 220 million gallons of used oil annually, with re-refining initiatives like the production of 600N-grade from vacuum tower bottoms extender (VTAE) upgrades positioned for growth in heavy-duty applications by 2025. Additionally, Safety-Kleen's closed-loop systems recover solvents—processing 16 million gallons in 2024—and through collection and reprocessing services that return materials to productive use, reducing the need for virgin resources. is integrated into these efforts, particularly during facility permitting, where Clean Harbors invests in local outreach to build trust and address environmental concerns. Strategic partnerships enhance Clean Harbors' sustainability impact, including collaborations with the U.S. Environmental Protection Agency (EPA) on green remediation technologies such as destruction via , where a 2025 joint study with the EPA and Department of Defense confirmed emissions levels two to eight times below regulatory limits. In emerging markets, operations in through a Global Capability Center in support sustainable practices by leveraging local expertise for broader environmental services, employing 1,694 individuals to advance global goals. These initiatives contributed to avoiding 4 million metric tons of in 2024, more than double the company's operational footprint. Looking ahead, Clean Harbors has set ambitious 2030 targets, including a Net Climate Benefit Factor of at least 3.0—measuring avoided emissions against operational ones—and a intensity reduction to 0.25 metric tons of CO2 equivalent per $1,000 of revenue. The company aims for a 50% increase in usage from its 2024 baseline of 2,508 megawatt-hours, focusing on facility and grid sourcing to further decarbonize operations.

Financial performance

Revenue and profitability

In the third quarter of 2025, Clean Harbors reported revenue of $1.55 billion, marking a 1.3% increase year-over-year from $1.53 billion in the prior year's quarter, primarily driven by growth in its Environmental Services segment, including Technical Services, alongside contributions from Safety-Kleen Sustainability Solutions. The company affirmed its full-year 2025 guidance for Adjusted EBITDA in the range of $1.155 billion to $1.175 billion, representing approximately 4% growth at the midpoint compared to 2024. However, these results included an earnings miss, with adjusted of $2.21 falling short of analyst expectations of $2.38, and revenue below the forecasted $1.57 billion. By segment, Environmental Services accounted for approximately 85% of third-party revenue at $1.32 billion, up 2.4% year-over-year, supported by a 5% increase in overall volumes, including 40% growth in volumes and 92% utilization. Safety-Kleen Sustainability Solutions contributed the remaining 15% with $230.8 million in , down 4.5% year-over-year, though re-refining margins improved due to lower costs and a higher mix of direct ; the segment is positioned for further enhancement through a planned $210–220 million in a 600N production unit, expected to add $30–40 million in annual EBITDA by 2028. Historically, Clean Harbors achieved full-year of $5.89 billion, up 9% from $5.41 billion in 2023, reflecting a consistent exceeding 10% since 2020, fueled by strategic acquisitions that expanded service capabilities and market reach. Profitability remained robust, with Q3 2025 operating income of $193 million, slightly above the prior year's $192.3 million, and Adjusted EBITDA of $320.2 million, up 6% year-over-year, yielding margins of 20.7%—an expansion of 100 basis points driven by cost efficiencies and pricing actions. These gains offset inflationary pressures in labor, transportation, and healthcare costs, while net debt stood at approximately $2 billion as of September 30, 2025, supported by strong generation and a conservative leverage ratio below 2x EBITDA. The company's debt profile, largely stemming from prior acquisitions, continues to enable growth investments without compromising financial stability.

Market position

Clean Harbors holds a leading position in the North American management industry, recognized as the largest provider of such services. Key competitors include and , which operate in broader but trail Clean Harbors in specialized handling due to its focused expertise and scale. As of November 2025, the company maintains a of approximately $11.1 billion. Its trailing price-to-earnings ratio is around 29.9x, reflecting investor confidence in its operational stability amid industry growth. Following the Q3 2025 earnings miss, where revenue and fell short of expectations, the stock declined 15% in the immediate aftermath, contributing to a year-to-date drop of about 9.7%. Clean Harbors' competitive advantages stem from its extensive integrated network of approximately 900 service locations across the U.S., , , and , enabling efficient nationwide coverage. The company's acquisition strategy has further enhanced its scale, allowing it to expand capabilities in high-barrier segments like waste disposal. Diversification into solutions, such as Safety-Kleen's re-refined base oils under the KLEEN+ brand, positions it to capitalize on trends. The broader industry context features accelerating demand driven by ESG mandates, which emphasize proper handling to meet regulatory and goals. However, risks persist from fluctuating prices affecting re-refining and evolving regulations that could increase costs. Clean Harbors' 2025 outlook remains linked to sector recovery, particularly in and gas, where deferred maintenance projects are expected to rebound and boost industrial services volumes. Analysts generally rate Clean Harbors as a "Moderate Buy," citing its operational discipline and strong generation as key strengths. Nonetheless, concerns linger regarding elevated levels following recent refinancings and volatility tied to commodity cycles.

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