Clean Harbors recycled more than 250 million combined gallons of used oil and solvents in 2025, according to the company's 2026 Sustainability Report released this week.

That single number is the headline metric from a voluntary disclosure the environmental services firm rolled out separately from its audited 10-K. It also represents the largest publicly stated combined volume Clean Harbors has disclosed on those two recovery streams to date.

What does the 250-million-gallon figure cover?

The 2026 report tracks 2025 operational data. Used oil and solvents sit at the top of Clean Harbors' recovery pyramid — the highest-value reclamation tier in a business that also handles hazardous waste across multiple treatment and disposal lines.

The combined-gallon total bundles those two streams into one bucket rather than breaking each out. That aggregation choice matters: re-refining used oil into base oil and reclaiming industrial solvents for reuse are two different commodity plays with different downstream buyers, and they face different regulatory classifications under EPA frameworks.

For now, the company is reporting throughput at the gate. ESG analysts and procurement officers will press for cleaner splits in subsequent disclosures.

Why does the combined-gallon number move the needle?

Every gallon Clean Harbors recovers is one less barrel of virgin crude heading into the refining slate and one less ton of hazardous material heading to incineration or secure landfill. Both outcomes carry regulatory weight under EPA permitting rules and the procurement criteria large industrial buyers apply to their waste vendors.

The scale also matters. With a 250-million-gallon recovery line on oil and solvents, Clean Harbors sits among a small group of operators with the volume to move re-refined base oil and reclaimed solvent into national commodity markets.

That volume flows into the recycling-segment revenue line investors watch each quarter, and it anchors the company's circularity pitch to industrial customers.

Where does the disclosure fall short?

The release pairs the 250-million-gallon headline with the phrase "among other sustainability milestones," a reference to additional metrics the company has yet to itemize publicly. The summary doesn't split oil from solvent, and it doesn't disclose how much of the collected material arrived through internal collection routes versus third-party generators.

Both gaps are common in first-pass hazardous-waste sustainability reports, where companies typically lead with an aggregated throughput headline. They close as the SEC's climate-rule framework moves back toward enforceable status and state-level extended producer responsibility schemes extend producer liability for oils and solvents.

What should readers watch next?

The next material checkpoint arrives when Clean Harbors files its Q1 2026 earnings, typically in early May. Investors tracking the company's circularity claims will want a recycling-segment revenue figure and any updated guidance on reclamation throughput — two data points that, paired with the 250-million-gallon headline, would convert a one-off sustainability disclosure into a tracked quarterly benchmark.

Equally important is whether Clean Harbors breaks the oil and solvent streams out separately in next year's report. Until it does, 250 million gallons is the number competitors will quote and the number analysts will want to verify against EPA biennial reports and state-level generator filings.

250 million gallons is the volume the rest of the industry will benchmark against, and the next sustainability report will decide whether the disclosure tracks operations or stays a single-number headline.