Clean Harbors (CLH) Q1 2026 earnings review
Beat and Raise Driven by Margin Expansion and SKSS Turnaround
Clean Harbors delivered a strong start to 2026, raising its full-year Adjusted EBITDA guidance midpoint by $40 million to $1.27 billion. While consolidated revenue grew a modest 2% year-over-year to $1.46 billion, profitability accelerated. The standout was the Safety-Kleen Sustainability Solutions (SKSS) segment, which saw earnings jump 17% despite a 7% revenue drop, validating management's aggressive 'charge-for-oil' strategy. Meanwhile, the core Environmental Services (ES) segment recorded its 16th consecutive quarter of margin expansion. The market reaction narrative is firmly bullish, as the company continues to squeeze higher profits out of stable volumes while positioning for macro tailwinds in reshoring and PFAS remediation.
🐂 Bull Case
Total Adjusted EBITDA grew 6% and margins expanded 60 basis points overall. Clean Harbors is demonstrating it can expand the bottom line even when end markets (like Industrial Services) remain soft.
The strategic pivot to charge for waste oil collection rather than paying for it is working flawlessly. A late-quarter surge in base oil pricing further padded margins, turning a historical headwind into a profit driver.
🐻 Bear Case
The Industrial Services segment continues to operate in a 'challenged market,' a continuation of the customer maintenance deferrals seen throughout 2025.
Incineration utilization fell to 80% from 88% a year ago, dragged down by weather impacts and a high number of planned maintenance days. This is the company's highest-margin disposal channel.
⚖️ Verdict: 🟢
Bullish. The $40M guidance raise in Q1 is a major signal of confidence. The combination of SKSS margin recovery, consistent ES execution, and macro tailwinds makes the modest top-line growth a secondary concern.
Key Themes
SKSS Profitability Reversal
Reversing. The most striking dynamic in the quarter was the divergence between SKSS revenue and profit. Segment revenue fell 7% YoY to $207 million, but Adjusted EBITDA jumped 17% to $33 million, driving a massive 320-basis-point margin expansion. This proves that management's 'charge-for-oil' (CFO) pricing strategy—where the company charges to collect waste oil rather than buying it—is successfully insulating the bottom line. A late-quarter improvement in base oil prices added a welcome tailwind.
Unbroken Streak of ES Margin Expansion
Stable. The Environmental Services (ES) segment remains the steady engine of the company, logging its 16th consecutive quarter of YoY Adjusted EBITDA margin improvement (up 50 bps to 23.2%). Despite operational hurdles, the segment grew revenue by 4% and EBITDA by 6%, demonstrating pricing discipline and efficient network leverage.
Incineration Utilization Takes a Hit
Decelerating. A key contradiction to the positive volume narrative is the drop in incineration utilization, which fell to 80% (down from 88% in 25Q1). Management attributed this to severe weather impacts and elevated planned maintenance days. Because incineration is heavily fixed-cost, lower utilization directly pressures margins. The ES segment's overall margin growth was saved entirely by a surge in alternative disposal methods.
Landfill Volumes Surge on Project Activity
Accelerating. While incinerators underwent maintenance, landfill volumes spiked 34% YoY. This was driven by robust project-related waste cleanup. The flexibility of Clean Harbors' disposal network allowed it to capture this volume and maintain ES segment growth despite the incinerator bottlenecks.
Industrial Services Remains a Laggard
Stable. The Industrial Services business continues to be the weakest link in the portfolio. Management explicitly noted it is operating in a 'challenged market,' a hangover from 2025 when chemical and refining customers broadly deferred maintenance and turnaround spending to cut costs.
Macro Tailwinds: Reshoring and PFAS
Accelerating. Management continues to bang the drum on U.S. economic reshoring and PFAS ('forever chemicals') remediation as the primary long-term secular growth engines. The pipeline for disposal and recycling services is expanding as domestic manufacturing construction breaks ground and regulatory scrutiny forces corporate action on PFAS.
Volume Decline in Waste Oil Collection
Decelerating. The SKSS segment collected 53 million gallons of waste oil in Q1. While this is adequate, it represents a step down from the 64 million gallons collected in Q2/Q3 2025 and 56 million in Q4 2025. Management's strict adherence to the charge-for-oil pricing strategy may be sacrificing some volume to protect margin spreads.
Other KPIs
Accelerating. While negative, this is a marked improvement from the -$115.7 million cash burn in 25Q1. First quarters are historically cash-negative for the company due to the timing of incentive compensation and interest payments. The YoY improvement gives management confidence to raise the full-year FCF guidance midpoint to $520 million.
Improving. The company set a new internal safety record, lowering its TRIR to 0.39 (down from 0.46 in Q1 2025). This is a critical metric for industrial customers when awarding large, complex remediation contracts.
Stable. The emergency response and field services arm generated steady 7% growth, buoyed by a steady stream of U.S. emergency events, including one large-scale project that contributed approximately $10 million in the quarter.
Guidance
Accelerating. Management raised the midpoint by $40 million to $1.27 billion. Compared to FY25's result of ~$1.17 billion, this implies an acceleration to roughly 8.5% YoY growth, driven by confidence in the SKSS recovery and sustained ES margins.
Accelerating. The midpoint was raised by $10 million to $520 million. This demonstrates exceptional cash conversion (over 40% of Adjusted EBITDA) and easily supports the company's aggressive capital allocation, including the newly expanded $600M share repurchase program.
Accelerating. This represents a sequential step-up from Q1's 6% growth and strongly outpaces the 1-3% Q1 growth target the company set back in 2025 Q4. The company is actively building momentum into the warmer months.
Key Questions
Incineration Maintenance Normalization
Utilization dropped to 80% due to weather and planned maintenance. Will we see a 'catch-up' effect in Q2 where deferred waste bolsters utilization rates back into the 90%+ range, or was revenue permanently lost?
Industrial Services Turnaround
You noted Industrial Services is still operating in a 'challenged market.' Are you seeing any green shoots from refiners signaling that they will finally resume the maintenance work they deferred throughout 2025?
Charge-For-Oil Volume Trade-offs
Waste oil gathered sequentially dropped to 53 million gallons in Q1. How much volume are you willing to sacrifice to maintain the rigid 'charge-for-oil' pricing discipline?
M&A Pipeline Priorities
With the DCI acquisition likely closing soon and leverage remaining low, are you prioritizing further bolt-on targets to expand the Field Services network, or looking at larger capacity additions in the disposal network?