Clean Harbors (CLH) Q3 2026 earnings review
Clean Harbors raises its profit plan, while incinerator growth slows
Clean Harbors, North America's largest hazardous-waste and used-oil recycler, got a huge boost from a single chemical spill and high oil prices. Revenue rose 21% from a year ago, or 13% by our math without that $120 million emergency job, while operating cash profit jumped 42%. Outgoing co-chief executive Mike Battles and incoming sole chief executive Eric Gerstenberg raised the full-year cash profit plan by $80 million.
| Revenue excluding $120M emergency cleanup | +12.9% 20.7% reported growth from a year ago |
|---|---|
| Operating cash profit (Adjusted EBITDA) | $456.1M +42.5% from a year ago |
| Used-oil refining (SKSS) cash profit | $126.5M +209% from a year ago |
| Full-year cash profit outlook | Raised $80M middle of the range: $1.46B (+25%) |
⚖️ Verdict: 🟢 Bullish
The story got better because the company no longer expects its profit growth to stall at the end of the year. Management now plans for fourth-quarter cash profit to rise about 25%, up from the 15% implied by its previous outlook, and customers paid 20% more upfront into the waste backlog since year-end. One caution: the core incineration division grew sales just 3% as plant use dipped to 87%.
The question now is how much of this year's jump can repeat in 2027 once the $120 million spill project finishes and global oil supply recovers. Either new manufacturing and data-center contracts fill the gap, or earnings step back when refining margins return to normal. Management's first 2027 outlook on the fourth-quarter call will tell.
🐂 Bull Case
One Emergency Cleanup Drove Half the Core Revenue Gain
Environmental Services is Clean Harbors' main division, handling hazardous waste disposal, industrial cleaning and chemical spills. Co-chief executive Eric Gerstenberg said the unit's results benefited from a "sizeable emergency response event" during the quarter.
- Environmental Services direct revenue: $1.55 billion, up 16.5% from a year ago
- Emergency response project: about $120 million of revenue at expedited rates
- Underlying division growth: 7.5% from a year ago by our math, excluding that single cleanup
- Division operating cash profit (Adjusted EBITDA): $425.4 million, up 19.1% from a year ago
This matters because the company's network of trucks and crews captured a massive job at premium rates, lifting the division's profit margin to 27.4%. Even without that $120 million project, total company revenue grew 12.9% by our math, as Safety-Kleen branch services rose 11%.
What to watch: Field Services revenue growth in the fourth quarter. A sharp drop after this cleanup finishes would show how much the recent growth acceleration relied on one-off spill work.
Used-Oil Refining Profit Tripled on Global Supply Shortages
Safety-Kleen Sustainability Solutions (SKSS) collects used motor oil and refines it into clean base oil and lubricants. Co-chief executive Mike Battles pointed to "global supply disruptions supporting higher prices for refined products". At the same time, the reliance on temporary oil price spikes remains a standing risk for next year.
Division operating cash profit (Adjusted EBITDA) more than tripled to $126.5 million, lifting its margin from 18.8% a year ago to 39.7% by our math. Clean Harbors gathered 62 million gallons of waste oil while keeping "an average charge-for-oil position", meaning customers paid it to take their used oil. Across the whole company, the cost of making products and delivering services fell by 3.1 percentage points of revenue.
Because oil spreads stayed wide, management raised its full-year cash profit outlook by $80 million. The company's prior plan pointed to fourth-quarter cash profit growth slowing to about 15% by our math, but the new outlook calls for 23% to 26% growth.
What to watch: fourth-quarter SKSS cash profit when full-year results arrive. A drop toward last year's $30 million level would signal that the refining windfall is ending.
Positives this quarter didn't test
Three long-term growth drivers stayed on track in management's commentary, but the release gave no new dollar figures to test them this quarter.
- Ten-year manufacturing disposal contract: Battles confirmed work began in the fourth quarter; fourth-quarter results will show whether it delivers the initial $10 million expected for 2026.
- PFAS (forever chemicals) cleanup and water filtration: Gerstenberg cited growth in PFAS work, and the conference call or annual report will show if annual revenue is still growing above 30%.
- Data center cleaning and fluid services: Battles said these offerings are "getting traction within Industrial Services"; the annual report will show if 2026 revenue reaches $15 million to $20 million.
🐻 Bear Case
Five Acquisitions Added $364 Million of Goodwill as Incinerator Use Dipped
Gerstenberg said the third-quarter performance underscored the "broad-based demand trends" across the environmental business. Clean Harbors also closed the acquisitions of ES&H and EnviroServe, bringing its total to five deals this year.
The numbers inside the disposal network were much quieter than the headline growth. Technical Services, which runs the company's scarce incinerators and landfills, grew revenue by just 3%, down from 18% last quarter. Incinerator capacity use slipped to 87% from 91% in the second quarter. Meanwhile, Clean Harbors spent $331.5 million in cash on acquisitions during the quarter by our math, pushing total goodwill up by $364.2 million since year-end to $1.84 billion.
Buying five field-service businesses in nine months adds integration risk while core incineration growth cools. What to watch: the organic revenue breakdown in the quarterly filing, which will show how much growth came from bought companies.
Headquarters and Compensation Costs Keep Outpacing Revenue
Clean Harbors tracks headquarters overhead, executive pay and insurance in its Corporate segment. As profits in the operating divisions rose, unallocated corporate costs climbed even faster.
- Corporate cash profit loss: $95.8 million, up 22.8% from $78.0 million a year ago
- Nine-month corporate loss: $261.4 million, up 16.6% from a year ago
- Stock-based compensation: $11.7 million in the quarter, up 31.6% from a year ago
- Full-year stock-based compensation plan: raised to $50 million–$53 million, up from $35 million–$38 million at the start of the year
Because revenue jumped 20.7%, selling, general and administrative expenses fell by 0.6 percentage points as a share of sales. In dollar terms, however, overhead is growing faster than the core disposal business. What to watch: whether headquarters costs fall back next year if oil refining profits cool.
Refinery Turnaround Softness Still Weighs on Industrial Services
Industrial Services cleans and maintains chemical plants and oil refineries during scheduled maintenance shutdowns, known as turnarounds. Gerstenberg noted that the business posted only modest growth because of "ongoing softness in refinery turnaround activity". Refineries have delayed maintenance for nearly two years.
Two other standing concerns also remain on the table. New data center and manufacturing contracts are too early to replace weak refinery spending this year, and total environmental cleanup and closure liabilities on the balance sheet edged up to $232.7 million. What to watch: management's 2027 refinery maintenance outlook on the fourth-quarter call, which will show if customers plan to resume normal spending.
👓 Other Themes
Eric Gerstenberg Becomes Sole Chief Executive as Mike Battles Retires
Clean Harbors is ending the co-chief executive structure it set up in March 2023. Mike Battles will retire from his executive role and the board at the end of 2026, staying on as an advisor in 2027, while Eric Gerstenberg becomes sole chief executive on January 1. Gerstenberg also announced a $55 million investment in Los Angeles to "expand our Hub concept to the West Coast".
💲 Other KPIs
Deferred revenue — cash customers have paid upfront for waste disposal not yet completed — rose 20.1% from the end of 2025 and 6.5% from a year ago. Gerstenberg attributed the $13.9 million quarterly increase to a "backlog of waste and growing sales pipeline". Last quarter, this balance was down 4.3% from a year earlier.
Total debt minus cash and short-term investments rose by $551 million from the end of 2025 by our math. Clean Harbors drew $120 million on its credit line and reduced its cash balance by $437 million over the first nine months to pay $689 million for five acquisitions.
Diluted shares fell 1.5% from a year ago. The environmental services group spent $25 million buying back its own stock in the third quarter by our math, matching its pace from the first two quarters of 2026 as it prioritized acquisition spending over larger buybacks.
🔮 Guidance
Raised. The company forecasts fourth-quarter operating cash profit to grow 24.5% at the middle of the range, slowing from 42.5% in the third quarter. By our math, the full-year outlook points to $347 million in the fourth quarter, well above the $320 million implied by the previous full-year plan.
Raised. Management lifted the middle of its full-year range by $80 million to $1.46 billion, or 24.8% growth from 2025 by our math. It is the third raise this year: +$40 million in the first quarter, +$110 million in the second, and +$80 million now.
Raised. The middle of the full-year profit range moved up by $39.5 million to $545.5 million, representing 39.5% growth for the year by our math. After $441.8 million in the first nine months, the plan leaves $103.7 million for the fourth quarter, up 19.8% from a year ago.
Raised. Clean Harbors increased the middle of its cash flow plan by $80 million to $630 million, up 23.7% for the year. That is the third raise this year: +$10 million, +$30 million, and +$80 million. By our math, it leaves $247 million for the fourth quarter, down 5.5% from a year ago.
Raised. The middle of the operating cash range rose by $80 million to $1.03 billion, or 18.8% annual growth by our math. After generating $664.7 million in the first nine months, the outlook implies $365.3 million in the fourth quarter, up 2.9% from last year.
❓ Key Questions
Why did incinerator revenue growth slow to 3%?
Technical Services revenue grew 3% and incinerator capacity use dipped to 87% from 91% last quarter, even as deferred waste revenue jumped 20%. Did planned maintenance hold back processing, or is core pricing cooling?
How much did the five acquisitions add to Q3?
Clean Harbors has spent $689 million on five acquisitions this year, including ES&H and EnviroServe. How much revenue and cash profit did bought companies contribute in the third quarter and to the raised full-year outlook?
What are the dollar sales for PFAS and data centers?
Management said PFAS cleanup work grew and data center services are gaining traction, but gave no dollar figures in the release. Are both businesses still tracking toward their 2026 revenue targets?
Why is corporate overhead up 23% this quarter?
Unallocated corporate expenses rose to $95.8 million from $78.0 million a year ago, and the full-year stock compensation forecast rose again. How much of this increase is temporary bonus pay tied to the oil windfall?