Environmentally Acceptable Lubricants (EAL) and VGP Compliance: Biodegradability, Toxicity and Bioaccumulation Standards Explained

Last verified: 2026-07-21

US federal regulation states, in one sentence, at 40 CFR §139.6(e), effective 8 November 2024: "An environmentally acceptable lubricant (EAL) must be used in any oil-to-sea interface unless such use is technically infeasible." That sentence is now binding text in the Code of Federal Regulations, not a recommendation buried in guidance. It raises the obvious next question: what, exactly, qualifies a lubricant to carry that label?

The same regulation answers it at 40 CFR §139.2. An EAL is a lubricant or hydraulic fluid — including any oil or grease — that is "biodegradable," "minimally-toxic," and "not bioaccumulative," as each term is separately defined in that section. All three, at once.

An EAL is not a type of oil — it is three separate test results a product has to pass at the same time. Passing one says nothing about the other two. It does not have to be vegetable-based, either — a detail this piece comes back to, because it contradicts a great deal of what circulates in supplier literature.

What exactly makes a lubricant "environmentally acceptable"?

The three criteria are independent tests, not a blended score. A fully biodegradable synthetic ester can still fail on acute aquatic toxicity. A non-toxic fluid can still bioaccumulate in tissue. That is precisely why the regulation joins the three with "and."

The shorthand that circulates instead — "at least 60% biodegradation in 28 days" — compresses a genuinely three-part test structure into a single number, and it drops the part that does most of the work: which share of the formulation has to pass, not just the pass rate of one endpoint.

Note the grease threshold is higher on toxicity and lower on biodegradability than the oil threshold. A grease and an oil are not held to the same bar for the same word.

These are the whole-formulation thresholds — the ones that matter for a first-pass supplier check. The full regulatory text at §139.2 also permits narrower, constituent-level pathways (a limited share of individual substances above 0.1% concentration can qualify under separate, tighter LC50/NOEC bands) and lists a few additional stand-alone ways to satisfy "not bioaccumulative" beyond log Kow and BCF/BAF (molecular mass above 800 Daltons, molecular diameter above 1.5 nm, or a low-molecular-weight-fraction test for polymers). None of that changes the numbers above; it only means a formulation that fails the table's simple version is not automatically disqualified without checking those narrower routes too.

Where does the EAL requirement actually apply on board?

The trigger is a defined location, not a general shipboard obligation. §139.2 defines an "oil-to-sea interface" as "any seal or surface on shipboard equipment where the design is such that oil or oily mixtures can escape directly into surrounding waters."

Secondary summaries of the 2013 VGP's own enumeration illustrate what that has typically meant in practice: controllable pitch propellers, thruster hydraulic systems, paddle wheel propulsion, stern tubes, thruster bearings, stabilizers, rudder bearings, azimuth thrusters, propulsion pod lubrication, and wire rope and mechanical equipment subject to immersion.

That list is a memory aid, not the law.

The law is the definition itself — can oil or an oily mixture escape directly into surrounding water through that seal or surface. Any new or unlisted equipment gets tested against that question, not against whether it happens to appear on someone's list. For the wider picture of how shipboard lubricant duties are split between system, cylinder and stern-tube applications, the guide to marine system oils covers the machinery side that sits behind these interfaces.

Is the 2013 VGP still in force today?

Yes, and the path to that "yes" runs through legislation, not a permit renewal. The 2013 Vessel General Permit took effect 19 December 2013 and, as originally drafted, expired 19 December 2018. The Vessel Incidental Discharge Act (VIDA), signed 4 December 2018, statutorily kept its substantive requirements alive past that expiry.

EPA has described the mechanism in its own words: VIDA "extended the 2013 VGP's provisions, leaving them in effect until both the EPA and USCG VIDA regulations are final, effective and enforceable." Both conditions. Not one.

EPA met its half of that condition on 20 September 2024, when it signed the Vessel Incidental Discharge National Standards of Performance (VID-NSP). The rule published in the Federal Register 9 October 2024, took effect 8 November 2024, and is codified at 40 CFR Part 139 — with a correction notice following 31 October 2024. The rule is built around three general standards (General Operation and Maintenance; Oil Management; Biofouling Management) plus specific standards for twenty separate discharge and equipment categories.

For context: EPA's first VGP dates to 2008, following litigation (Northwest Environmental Advocates and others v. EPA, filed 2003, decided March 2005, upheld on appeal July 2008) that found EPA's blanket exclusion of vessel discharges from permitting exceeded its authority. The 2013 reissuance is where the mandatory EAL requirement at oil-to-sea interfaces was introduced. The 2008 version, per secondary industry summaries of its text (EPA's own program-history page does not itself detail either permit's lubricant language), recommended rather than required an environmentally preferable lubricant — "should," not "must" — and did not carry the defined biodegradable/minimally-toxic/non-bioaccumulative EAL standard the 2013 VGP introduced.

So: today, the substantive 2013 VGP requirements govern, including the EAL requirement — which is also now independently codified at §139.6(e), effective 8 November 2024. Operators are already bound by the EAL rule today. This is not a future requirement.

What changes once the Coast Guard's rules are finalised?

The piece that is still missing is the US Coast Guard's own implementing regulation — the inspection procedures, penalty and enforcement mechanics, and permit-replacement mechanics. EPA states USCG's rules are expected within two years of EPA finalising its standards in 2024, which points to a statutory deadline around October 2026.

They are not final yet. EPA's "Commercial Vessel Discharge Standards" page, last updated 26 June 2026, still describes the interim framework — the continued 2013 VGP requirements, alongside the new §139.6(e) codification — as the operative one. No USCG rulemaking docket number, and no post-June-2026 USCG status, could be confirmed for this article; none is asserted here.

When USCG's rules do land, several things move. The 2013 VGP and certain related state and USCG rules get repealed. USCG becomes the enforcing and inspecting authority under its own regulations. State authority to impose stricter standards becomes preempted, with two statutory pathways preserved: a state governor may petition EPA for more-stringent standards in that state's waters, or apply to designate specific waters as no-discharge zones. That preemption sits in 33 U.S.C. §1322(p).

What is unlikely to change is the EAL requirement itself. It is already independently codified in federal regulation, separate from the VGP framework it grew out of. USCG finalisation is expected to settle who enforces it and how — not whether it applies.

Can an operator lawfully skip an EAL?

Yes, under a documented technical-infeasibility finding — and EPA has deliberately kept the paperwork light. Its own guidance describes an operator needing "only keep one brief record of their determination that use of EALs is technically infeasible," with the recorded information "intended to be simple, basic, and straightforward."

For some vessels, EPA's guidance acknowledges, it is necessary to wait until the next dry docking to replace traditional oils with EALs. Operators must still report their use of non-EALs in the Annual Report. That documentation duty sits inside EPA's program guidance, built on the permit's broader recordkeeping framework — it is not itself a single numbered CFR paragraph, and this article does not treat it as one.

Which test methods and thresholds are still current?

Most of the standard toolkit is current and unremarkable. OECD 301 series methods, including 301B, remain the working reference for ready biodegradability. ASTM D5864-23 is the current edition for aerobic aquatic biodegradation of lubricants. ASTM D6081-22 is current for aquatic toxicity testing and interpretation.

One method is not, and this is worth real space: ASTM withdrew D7373 in 2021. ASTM's own catalogue confirms it directly — "Standard Test Method for Predicting Biodegradability of Lubricants Using a Bio-kinetic Model (Withdrawn 2021)." It is not current, and it is not interchangeable with OECD 301B.

It is, however, still being cited today — by prominent EAL explainer content still in active circulation — as though it were a live testing option. A five-year-stale citation, and it keeps getting copied forward.

The toxicity endpoints — OECD 201 (algal growth inhibition), 202 (Daphnia acute), 203 (fish acute) — remain in active use. TG 203 is worth flagging as a watch item: a Switzerland- and UK-led effort has been under way for several years to move it from a lethal LC50/mortality endpoint toward non-lethal, moribundity-based endpoints on animal-welfare grounds. OECD did formally update TG 203 on 25 June 2025, as part of a batch of 56 revised or corrected Test Guidelines — but that update refined recording, range-finding and analytical requirements (including expanded tracking of abnormal signs and, optionally, tissue sampling); it did not exclude moribund fish or replace the lethal endpoint. The non-lethal, moribundity-based endpoint itself remains future work, not the current method.

For bioaccumulation, OECD 107 and 117 (log Kow, by shake-flask and HPLC respectively) are both current; 117 was most recently republished in 2022.

Must an EAL be a vegetable oil?

No — and this is the article's other headline correction. ISO 15380:2023 is the current edition, superseding ISO 15380:2016, and it references four EAL base-fluid families under ISO 6743-4: HETG (triglycerides, vegetable or animal-oil based), HEPG (polyglycols/PAG), HEES (synthetic esters), and HEPR — polyalphaolefins and other synthetic hydrocarbons.

HEPR is a synthetic hydrocarbon. It is also one of ISO's four recognised EAL families. A lubricant can be entirely synthetic in lineage, share its chemistry with a conventional PAO, and still qualify as an EAL — provided it meets the three test criteria above. "Vegetable-based" and "environmentally acceptable" are related concepts in practice, not the same concept by definition.

Is a third-party ecolabel enough on its own?

Not on its own, and the current US definition makes that easier to see than it might appear. 40 CFR §139.2 is purely criteria-based. It defines an EAL by the three measurable properties and makes no reference anywhere to ecolabels, labelling programmes, or third-party certification schemes.

EPA's earlier program guidance — not the current codified text — did name recognised labelling programmes as accepted evidence: OSPAR, Blue Angel, the EU Ecolabel, Nordic Swan, and a Swedish Standard, alongside direct laboratory test data and TDS/SDS documentation. That list is corroborated through secondary summaries of EPA's fact sheet rather than requoted from the source document itself.

Treat an ecolabel as one evidentiary pathway EPA's guidance has historically recognised — not as a legal guarantee, and not as part of today's codified definition. Two things are worth confirming before relying on one: that the label's own criteria genuinely test biodegradability and toxicity and bioaccumulation to comparable or stricter thresholds, and that the label is still active for that product category.

The second check matters more than it sounds like it should. Nordic Swan's lubricants product group has been withdrawn. Nordic Ecolabelling's own current criteria index lists more than 60 active product groups, and none of them covers lubricants, hydraulic oil, or chain oil — "lubricants" now appears only as a narrow allowance inside the unrelated cosmetics product group, meaning personal or medical lubricants, not machinery lubricants. Any current guidance that still points a buyer toward Nordic Swan as an available lubricant ecolabel is simply out of date.

The EU Ecolabel is still active. Commission Decision (EU) 2018/1702 of 8 November 2018 established its criteria for lubricants (product group '027'); a consolidated text dated 20 December 2024 extends validity to 31 December 2028, after the original 31 December 2024 expiry. It remains a voluntary scheme — no EU or EEA law requires a supplier to hold it, and no EU/EEA-wide mandatory shipboard-EAL rule equivalent to the US requirement could be confirmed here.

Blue Angel's relevant label, DE-UZ 178 ("Biodegradable Lubricants and Hydraulic Fluids"), is current in its January 2022, Version 2 edition, administered by RAL gGmbH, which checks compliance and contracts with companies for use of the mark.

A Swedish Standard exists in this space too, but here the sources this article draws on disagree on detail: one traces, via RISE's own pages, that SS 15 54 70 covers grease and SS 15 54 34 covers hydraulic fluid — two different numbers for two different product types, commonly transposed in casual references — while the other could not confirm currency for either. Confirm which number applies to your product type directly; neither is asserted as current here.

One more mix-up is worth naming directly. OSPAR's Harmonised Offshore Chemical Notification Format governs chemicals used in offshore oil-and-gas exploration and production — a different product universe, a different purpose, and different pass criteria from marine-lubricant EAL or ecolabel criteria. A favourable OSPAR ranking is not equivalent to "EAL-compliant." The confusion is not purely a marketing artefact, either: EPA's own historical guidance list grouped OSPAR alongside genuine product ecolabels, which is exactly how the two get run together downstream.

How should a buyer weigh the evidence in front of them?

Evidence for an EAL claim comes in a rough hierarchy, and the ISO 14020 family of standards is a useful frame for it.

At the base sits the manufacturer's own self-declaration — an ISO 14021 "Type II" self-declared environmental claim, made by the party that benefits commercially from it, with no mandatory third-party verification attached. It is evidentiary, not verificatory: it does not prove independent testing occurred, and it does not confirm the tested formulation matches the batch actually shipped. EPA does accept manufacturer self-certification as one legitimate route, so a document titled a "VGP Compliance Declaration Certificate" is not itself a legally mandated form — but some document beyond a plain SDS or TDS is needed: a self-declaration naming the specific criteria met, a recognised third-party ecolabel certificate, or the underlying accredited test data itself.

One step up is a third-party ecolabel certificate — an ISO 14024 "Type I" label, voluntary, multi-criteria, awarded by an independent third party against a published, dated criteria set. For the EU Ecolabel, a national Competent Body is required to ensure verification testing is carried out by an independent party. These are checkable, not just claimable: the EU Ecolabel's e-Catalogue (ECAT) and Blue Angel's own free public product database both allow direct lookup.

Stronger still, in principle, are raw test reports from an accredited laboratory. Here is the surprise worth sitting with: ISO/IEC 17025:2017 accredits the laboratory — its competence, impartiality, and consistent operation for a defined, listed scope of test methods. It does not certify the product. A product can be tested by a fully accredited lab and still fail the threshold outright. A report is only as strong as three things holding together: the accreditation scope actually covering the specific method used, the sample matching the shipped formulation and batch, and the report being dated and traceable to a named accreditation body whose scope listing can itself be checked.

A class-society statement or type approval is different again, and often mistaken for an environmental credential. It is a design and performance-suitability finding, not an environmental certificate. DNV, for instance, updated its rules from 1 July 2019 to require verification of satisfactory hydrodynamic lubrication for EALs used in stern-tube bearings — a mechanical safety finding, entirely separate from any biodegradability claim. Class answers "is this suitable for this machinery." It never answers "does this meet the EAL criteria."

A document is worth questioning, regardless of type, if it is undated; if it is unscoped — a lab accreditation certificate that does not list the specific method used in the report; if it references a different product code, grade, or formulation revision than what actually ships; or if the certificate has expired or cites a criteria version that has since lapsed.

A short, forwardable question set for a supplier follows directly from that list:

• Which of the three criteria — biodegradability, toxicity, bioaccumulation — does the supplied test data actually cover, and which test method and edition was used for each?
• Is the tested formulation the same one currently being shipped, and has it changed since the certificate's date?
• If a third-party ecolabel is cited, is it still an active product group for this product type, and can it be verified directly in the label's own public registry?
• If a laboratory accreditation certificate is offered, does its scope list the specific test method used in the report, or only the laboratory in general?
• If a class-society document is offered, does it address environmental criteria at all, or only mechanical or design suitability?
• Where a non-EAL is proposed instead, is there a dated, documented technical-infeasibility justification on file?

Does a safety data sheet already prove compliance?

No — an SDS is a hazard-communication document, not a compliance record. It follows the standard 16-section GHS format, and Section 12, Ecological Information, does legitimately carry aquatic and terrestrial ecotoxicity data, persistence and biodegradability data, bioaccumulation potential (log Kow, BCF), and soil mobility.

But Section 12 is a self-compiled hazard-classification summary, with no third-party audit requirement attached to it. It is not a pass/fail determination against a named regulatory threshold. It carries no licence number and no competent-body sign-off.

A buyer relying on the SDS alone for an EAL-sensitive purchase has obtained hazard data. Not compliance evidence.

A TDS, by contrast, is performance data — viscosity, pour point, and the like. A Certificate of Analysis is batch conformity data, and it is only useful as EAL evidence if the specification it certifies against explicitly names the environmental parameters in the first place.

Who keeps which records — the vessel or the buyer?

Two different files, held by two different parties, and neither substitutes for the other. Under the US regime, the vessel operator holds records on board: safety data sheets for EALs used at oil-to-sea interfaces, documentation of whether each EAL is registered under a recognised labelling programme, and a recorded justification wherever EAL use was found technically infeasible. EPA treats electronic records as equivalent to written ones kept on the vessel, provided they are accessible to inspectors in readable format.

The buyer or importer holds something else: a commercial procurement file — the evidence pack described above — used to demonstrate to its own customers and auditors that what it bought and supplied carries adequate documentation.

Neither file satisfies the other's purpose.

On retention periods, this article makes no claim: how long either record must be kept was not verified against a confirmed source, and the reader should check the applicable permit or rule directly with EPA and USCG rather than rely on a duration stated secondhand.

Are EALs holding up in service?

This is a genuine, documented concern, and it deserves a neutral account rather than a verdict either way.

Gard, a marine mutual insurer, published on 11 October 2023 that "as many as 80% of the incidents investigated, involved stern tube seals' failure with EAL oil in use whilst the average age of the vessels was 12 years" — drawn from a review of stern-tube claims across 2013–2022, a claims base it describes as exceeding 700 cases over the decade.

That statistic is genuinely real, named, and dated. It is also incomplete on its own terms: Gard's published article does not disclose the sample size behind the 80% figure itself, nor how "investigated" incidents were selected out of the 700-plus claims. Cite it as Gard's finding, from that date — not as an independently peer-reviewed statistic.

DNV, together with the University of Sheffield and Nordic marine insurers, published on 11 October 2019 that EALs exhibit "lower true viscosity in the minimum oil film thickness region" under high-load conditions typical of the observed aft-bearing failures — a plausible mechanism, not a differentiated one; DNV's article does not break results out by EAL sub-type.

One claim that circulates does not hold up against that finding: that synthetic EALs categorically offer better film strength and wear protection than mineral oil. DNV's own data points the other way for typical stern-tube EALs under high load.

Trade commentary tends to lay the blame elsewhere — on specific formulations rather than the category. Lower-grade blends built on unsaturated esters, cost-optimised chemistries, or poor thermal and hydrolytic stability are named as the likely culprits, with fully saturated synthetic esters cited as reliable long-life performers by comparison. Some stern-tube EALs are reported to show rising acidity, rising viscosity, or sludge blocking the seal oil-feed within roughly two to two-and-a-half years — framed, in that commentary, as a failure mode of specific poorly formulated products rather than a design flaw in the category. Properly formulated EALs are stated to be approved for the full five-year drydock interval.

Take the honest middle position: a real, insurer- and class-documented concern exists that EAL adoption in stern tubes coincided with a rise in bearing and seal failures. The available commentary points primarily at specific lower-grade formulations and reduced film thickness under high load, rather than at the category as inherently unfit for purpose — but no rigorous, independent apportionment between "formulation" and "category" was located for this article, and none is claimed here.

Practical guidance that does hold up: ensure seal-material compatibility before conversion, carry out proper system monitoring in line with the oil and seal makers' own recommendations, and consider the next higher viscosity grade (DNV, 2019). Seal-material incompatibility commonly makes a flush — and sometimes seal replacement — necessary, typically scheduled to coincide with drydock.

Does VIDA extend the EAL rule to deck equipment?

No. A claim circulates that VIDA "expands" the biodegradability requirement to non-water-contact, above-waterline deck equipment. It does not hold up against the actual codified text.

The Decks standard, at 40 CFR §139.15, contains no EAL or oil-to-sea-interface requirement for deck equipment at all. What it does require is that deck washdown soap, cleaner, or detergent be minimally-toxic, phosphate-free, and biodegradable — and that machinery expected to leak be fitted with coamings or drip pans to collect spilled oil, not lubricated with an EAL in the first place.

The EAL requirement stays exactly where it started: genuine oil-to-sea interfaces. Collection and lubrication are two different obligations, applied to two different problems, in two different sections of the same rule.

So what should a buyer actually check next?

Start with the definition, not the marketing. Ask which of the three criteria the supplier's evidence actually addresses, with which method, on which formulation, dated when. Cross-check any named ecolabel against that label's own current registry — not a supplier's product sheet, and not a summary article written before that registry last changed. Where a non-EAL is proposed for a given application, ask for the dated technical-infeasibility record that justifies it.

Altonex Global does not test, certify, inspect, or declare any product compliant with EAL or VGP criteria — none of that is a role a trade platform can occupy. That determination sits with the buyer, the supplier, an accredited laboratory, a class society, or the regulator, in whatever combination the transaction actually requires. What a platform can usefully do is put the buyer and the supplier in direct contact: suppliers listing marine lubricants can be sent the six-question evidence set through a single request for quotation, so the test reports, ecolabel certificates and technical-infeasibility records can be requested, exchanged and checked between the two parties who can actually stand behind them.

One closing caution, because this is regulatory content with moving parts. USCG's implementing rules are still pending against a statutory deadline around October 2026, and they will change enforcement mechanics even where the underlying EAL requirement does not move. Ecolabel product groups get added and withdrawn — Nordic Swan's own history above is the proof of that. Standards and regulations change: verify current status directly with EPA and USCG, and check any standard or ecolabel citation against the issuing body's own current registry before acting on it — not against a supplier's datasheet, and not against this article.

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