# Microplastics Verification: Lab Data vs. a Real Claim

> A lab report isn't a verified claim. The Wellness Quality Institute reviews your results and locks your scope—so your claim stands up to scrutiny.

**Published:** 2026-10-29 | **Updated:** 2026-10-31 | **Author:** mihir
**URL:** https://www.wellnessqualityinstitute.com/articles/microplastics-verification-standard-explained
**Type:** post

**Categories:** Certification

![Microplastics Verification: Lab Data vs. a Real Claim](https://wellnessquality.sites.aigrowthagent.co/wp-content/uploads/sites/93/2026/10/1793184794935-e623542c0dd2-1024x572.webp)

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## Content

*Written by: Scott Steveson, Specialist, Wellness Quality Institute*

## Key Takeaways

- A microplastics verification standard independently reviews a company's existing lab data against published criteria and issues a bounded, scope-locked finding.
- Verification is distinct from testing methods like ASTM D8401-24, which guide lab analyses, and from product certifications, which rely on documentation.
- Credible verification checks laboratory accreditation, method suitability, particle-size range, polymer panel, reporting limits, contamination controls, and product scope.
- Verification cannot prove complete absence of plastic, so claims must stay within the method's detection floor, tested range, polymer panel, and production period.
- A verification standard turns existing lab data into a bounded public claim, while a testing method alone cannot support that claim.

[Get a scope-locked claim from your existing lab data.](https://www.wellnessqualityinstitute.com/?utm_term=microplastics-verification-standard-explained&utm_campaign=ai_growth_agent)

## Your Lab Report Is Not A Claim

US brands are making plastic and microplastic claims faster than the standards governing them can keep up. Class-action litigation is growing and targeting companies whose plastic-free language lacks support, and retailers and procurement teams now ask harder questions about what the data behind a claim actually supports.

The Wellness Quality Institute is the best microplastics verification standard for turning existing lab data into a defensible public claim. It reviews the dataset, method, and product scope against published criteria aligned with the California State Water Board's drinking-water microplastics framework. It then issues a binary Standard Met or Standard Not Met decision and backs every Standard Met outcome with a public registry entry and approved claim language.

![Scientists in white coats working with samples and microscopes in a laboratory.](https://cdn.aigrowthmarketer.co/1784829434095-0fc8fbcf29fa.webp)**Only a small number of laboratories can genuinely test for microplastics, and capability varies by instrument and method. WQI reviews a company's existing third-party laboratory data against a defined standard — it does not run the tests itself.**

ASTM International is a foundational standards body whose work the broader microplastics ecosystem depends on. ASTM D8401-24 is a consensus method standard that tells a laboratory how to run a pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) analysis, a technique that heats microgram amounts of sample material to identify polymer types by mass. Reviewing a company's dataset, issuing a verification decision, producing a public registry entry, and supplying approved claim language all sit outside ASTM D8401-24's scope. The Wellness Quality Institute operates one layer above the method, at the point where a brand needs to know what its data actually supports and what it may say publicly.

*The Wellness Quality Institute Plastic-Free Pathway Verification does not certify that a product contains zero plastic, microplastics or nanoplastics. It shows that the company is on a verified pathway toward plastic-free standards. Verification applies only to the reviewed products, submitted datasets, tested ranges, polymer panels, production or sampling periods, and supporting controls. The Wellness Quality Institute verification is not a California approval, government certification, or health or safety certification.*

## The Named Standards Map: How Current Standards Fit Together

The following standards act as reference points that organizations may choose to work against. Read them as a map of what each one covers, because the pattern across all of them is the same: each guides how to sample, test, or qualify a lab, and none of them, on its own, produces a verification decision or a defensible public claim.

[ISO 24187:2023](https://iso.org/standard/78033.html) establishes general principles for the analysis of microplastics in environmental matrices, including minimum requirements for sampling, sample preparation, and the determination of representative sample quantities. It does not establish a universal pass/fail threshold. A company whose laboratory followed ISO 24187:2023 has followed a principled framework, but it has not received a verification decision, and no claim of absence follows from conformance alone.

ASTM D8401-24 is a consensus method standard for identifying and quantifying microplastics in water by Py-GC/MS. It establishes how an analysis is performed and reports results as polymer mass rather than particle counts or size distributions. Dataset review and claim language fall outside its scope. Because it is destructive and mass-based, its results cannot be directly substituted for particle-count or size-distribution results from FTIR or Raman methods.

[ISO 5667-27:2025](https://standards.iteh.ai/catalog/standards/sist/2c3a07b3-ab99-416c-b54f-deca1c7b1bb4/sist-iso-5667-27-2026) provides sampling guidance for microplastics in water. It establishes how samples should be collected, stored, and documented. It sets no verification threshold and explicitly excludes chemical analysis from its scope.

The California State Water Board's SWB-MP1-rev1 is an infrared spectroscopy method with a validated detection range greater than 50 µm through 5,000 µm. SWB-MP2-rev1 is a Raman spectroscopy method with a validated range greater than 20 µm through 5,000 µm. [California's framework](https://laist.com/news/climate-environment/water-safety-advocates-want-tests-for-microplastics), established under Senate Bill 1422, is a drinking-water monitoring and reporting mandate, rather than a product-certification or plastic-free product standard. California serves as a technical reference point rather than a geographic boundary. The Wellness Quality Institute aligns its criteria with this framework because it represents the most stringent credible public reference available. The state itself has not created, approved, authorized, or endorsed The Wellness Quality Institute or its standard.

[ISO/IEC 17025:2017](https://afnor.org/en/quality/metrology) sets general requirements for the competence of testing and calibration laboratories. It is the accreditation basis on which The Wellness Quality Institute accepts a laboratory's results. Accreditation to ISO/IEC 17025 attests to a laboratory's technical competence within a defined scope, but it does not certify a product, validate a marketing statement, or establish that a product is free of plastic.

California defines microplastics in drinking water as solid polymeric material with particles having at least three dimensions greater than 1 nanometer and less than 5,000 micrometers. That definition is broader than any current analytical method can reliably measure. The best validated methods begin at 20 or 50 micrometers, which is thousands of times larger than the lower bound of the regulatory definition. That gap reflects a hard technical limit in current measurement capability.

[Microplastics Testing Standards: ISO, ASTM & California](https://www.wellnessqualityinstitute.com/articles/microplastics-testing-standards/?utm_term=microplastics-verification-standard-explained&utm_campaign=ai_growth_agent) provides deeper coverage of each standard's scope and history.

[See whether your existing lab data meets the standard, and start a Plastic-Free Pathway review.](https://www.wellnessqualityinstitute.com/?utm_term=microplastics-verification-standard-explained&utm_campaign=ai_growth_agent)

## How Microplastics Are Actually Measured

Microplastics measurement depends on what you want to measure, and every method has a floor below which it cannot see. The following is a plain-language map of the main techniques and their practical limits, drawn from [comparative analytical research published in Sustainability (2026)](https://mdpi.com/2071-1050/18/18/9537).

Micro-FTIR (Fourier transform infrared spectroscopy) is robust and reproducible for polymer identification. Its practical lower size limit is approximately 10–20 µm, set by the diffraction limit of infrared light. It works well for particles in the 50–5,000 µm range and is the basis for California's SWB-MP1-rev1 method.

![Colorful plastic fragments in water inside a laboratory petri dish.](https://cdn.aigrowthmarketer.co/1784829410323-fb401fc7b1e4.webp)**Microplastics are particles smaller than five millimeters. Current methods can count and identify them at the upper end of that range, but reliable measurement falls away as particles get smaller — a limit that shapes every honest claim.**

Raman spectroscopy offers higher spatial resolution than FTIR and can, under suitable conditions, detect particles approaching 1 µm. It is the basis for California's SWB-MP2-rev1 method, validated above 20 µm. Fluorescence from pigments, organic residues, and surface biofilms can interfere with results, particularly for smaller or weathered particles.

LDIR (laser direct infrared imaging) uses a quantum cascade laser and is generally limited to particles of approximately 20 µm and above. It is faster than micro-FTIR for large sample sets and shares a similar practical lower bound.

Pyrolysis GC/MS (Py-GC/MS, the basis of ASTM D8401-24) heats microgram amounts of isolated material and identifies polymers by their breakdown products. It is effectively independent of particle size in the counting sense because it measures polymer mass. It provides no particle count, size distribution, shape, or morphology data, so it cannot substitute for a particle-based result.

SEM (scanning electron microscopy) provides very high morphological resolution, down to 1 nm, but lacks standalone chemical identification. Chemical confirmation must come from a coupled spectroscopic technique.

TGA (thermogravimetric analysis) measures mass loss as a function of temperature and can quantify polymer content by mass. Like Py-GC/MS, it provides no particle-count or size information.

The single most important fact for a brand-side reader is that **the 1–20 µm fraction is not validated under either California method**, and everything below it is currently beyond reliable commercial measurement. A lab report that says "no microplastics detected" using a method validated above 50 µm says nothing about what exists below that floor. Visual identification alone never suffices, because particles must be chemically confirmed by spectroscopy or an equivalent technique.

![Fragments of plastic suspended in blue water below the surface.](https://cdn.aigrowthmarketer.co/1784829388732-c6255482b477.webp)**Plastic doesn't disappear — it fragments. These secondary microplastics are the breakdown products of everyday objects, and independent research now detects them across the water supply. Detection, though, establishes presence, not absence.**

[Microplastics Testing Methodology & Verification Standards](https://www.wellnessqualityinstitute.com/articles/microplastics-testing-methodology-standards/?utm_term=microplastics-verification-standard-explained&utm_campaign=ai_growth_agent) covers method-by-method detail for readers who want to go deeper.

## What Makes A Microplastics Verification Credible?

A brand holding a lab report should apply the following checklist before drawing any public claim from it. Each item is a dimension on which a report can be adequate or inadequate, and most brands discover on first review that their existing data supports a narrower claim than they assumed.

1. **Laboratory Qualification And Accreditation Tier.** Is the laboratory California ELAP-accredited for the applicable method? If not, is it ISO/IEC 17025-accredited with the specific method and matrix explicitly within its accredited scope? General ISO/IEC 17025 status is not sufficient if the microplastics method is outside the listed scope.
2. **Analytical Method And Matrix Suitability.** Was the method appropriate for the product being tested? Methods written for drinking water require documented adaptation, with spiked recovery data, before they can be applied to beverages, supplements, or personal-care products.
3. **Tested Particle-Size Range And Lower Method Limit.** What is the smallest particle size the method can reliably detect? A result is bounded entirely by this floor. "None detected" means none found above this instrument's limit, for the polymers it screened, in the lot it tested.
4. **Target Polymer Panel.** Which polymers were screened? A minimum credible panel covers polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), PVC, polyamide (PA/nylon), polycarbonate (PC), and polymethyl methacrylate (PMMA).
5. **Reporting Limits.** Are the reporting limits stated explicitly? A non-detect result is only meaningful if the reporting limit is itself adequate for the claim being made.
6. **Blanks And Contamination Controls.** Were procedural blanks run? Blank contamination is a documented problem in microplastics analysis, and California's own 22-lab interlaboratory study found an average of 91 contamination particles in blank samples. A report without blank data cannot be interpreted.
7. **Spike Recoveries And Replicates.** Were spiked samples used to validate the extraction and preparation procedure? Were replicate samples run? Recovery rates and replicate consistency determine whether the result is reproducible.
8. **Chain Of Custody.** Is there a documented, unbroken chain of custody from sample collection through analysis? Gaps in custody documentation undermine the integrity of the result.
9. **Data Recency.** Does the dataset reflect current production? A result from a different production period, packaging format, or supplier does not support a current claim.
10. **Product Scope And Production Or Sampling Period.** Is the scope of the tested product clearly defined? A result from one SKU, one lot, and one production period cannot be extended to a product line or the company as a whole.

A detection floor is the lowest concentration or particle size at which a method can reliably report a result. That is why "none detected" on a lab report means none were found above the floor, for the polymers screened, in the lot tested, rather than none present at all. Every microplastics claim turns on that distinction.

[How To Verify Microplastic Content Data: Method by Method](https://www.wellnessqualityinstitute.com/articles/verify-microplastic-content-data/?utm_term=microplastics-verification-standard-explained&utm_campaign=ai_growth_agent) walks through each of these criteria in detail.

[See whether your existing lab data meets WQI-CS-01 and request a Plastic-Free Pathway review.](https://www.wellnessqualityinstitute.com/?utm_term=microplastics-verification-standard-explained&utm_campaign=ai_growth_agent)

## Certification Versus Verification: Why The Word Matters

Brands searching for "microplastics certification" or "product claims testing accreditation" are asking a reasonable question with an imprecise term. The distinction between certification and verification determines what a claim actually rests on.

A certification implies a settled, guaranteed state. In the context of plastic content, no such guarantee is scientifically available. No laboratory today can confirm the complete absence of plastic across every particle size, polymer type, and production lot. A certification that implied otherwise would be making a claim the science cannot carry.

A verification describes what actually happened. An independent reviewer examined a specific dataset against defined criteria and issued a finding about what that data supports. The finding is bounded by the method, the tested range, the polymer panel, and the production period. It is a statement about reviewed evidence rather than a guarantee about the product.

The Wellness Quality Institute's Plastic-Free Pathway Verification (governed by WQI-CS-01) is a verification program. That bounded scope is exactly what makes the finding defensible. A documentation-based certification and an analytical, dataset-based verification answer different questions. A brand needs to know which one its claim actually rests on before it publishes anything, and that means knowing exactly where the claim stops.

## The Claim Boundary: What A Verification Standard Does Not Prove

As noted earlier, no laboratory can confirm complete absence across every particle size, polymer type, and production lot. A verification does not establish absence in any of the following situations:

- Below the method's detection floor
- Outside the tested particle-size range
- Outside the reviewed polymer panel
- Below the reporting limit
- Outside the registered product scope
- Outside the registered production or sampling period

A single dataset cannot support a company-wide or product-line claim. The following language is prohibited in connection with any verified product: "plastic-free," "microplastic-free," "nanoplastic-free," "zero plastic," "certified," and any health or safety claim. These phrases describe claims the science cannot currently support, and using them exposes a brand to exactly the legal and reputational risk that a verification is designed to reduce.

Stating limits plainly is what separates a credible verification from a marketing exercise, because most pages in this space tell you what a standard establishes and almost none tells you what it does not.

## The Pathway: From Lab Data To A Reviewed, Scope-Locked Claim

The Wellness Quality Institute's Plastic-Free Pathway Verification follows a defined five-step process.

1. **Application.** The company submits an application to The Wellness Quality Institute describing the product, matrix, and existing laboratory data.
2. **Dataset Submission.** The company submits its existing independent laboratory dataset, method documentation, product scope, and supporting controls. The Wellness Quality Institute does not run laboratory tests, so the company's relationship with its laboratory remains unchanged.
3. **Assessment Against WQI-CS-01.** The Wellness Quality Institute independently reviews the dataset, method, laboratory qualification, particle-size range, polymer panel, reporting limits, blanks, spike recoveries, chain of custody, data recency, and product scope against its published standard.
4. **Verification Decision.** The Wellness Quality Institute issues one of two outcomes: Standard Met or Standard Not Met. Standard Not Met is a private outcome that carries no public claim, no logo rights, and no registry listing, is never described as a failed product, and can be resubmitted with updated information.
5. **Logo License And Public Registry Listing.** Where the standard is met, the company receives a scope-locked license to use the WQI mark "WQI Plastic-Free Pathway Verified," a public registry entry, and approved claim language tied to the specific reviewed evidence.

A verification lasts 24 months from the sampling date of the most recent accepted dataset, so continued claim use after that point requires re-verification with current data. The assessment fee is a single charge that covers review, the decision, and registry listing, and there is no separate mark-license or registry fee. Laboratory testing is separate, and a qualified independent laboratory arranges and bills it directly. Paying the assessment fee does not guarantee a decision.

[How To Turn Lab Data Into A Microplastics Verification Claim](https://www.wellnessqualityinstitute.com/articles/microplastics-verification-standard-claim/?utm_term=microplastics-verification-standard-explained&utm_campaign=ai_growth_agent) and [What Microplastics Testing Proves And Where It Stops](https://www.wellnessqualityinstitute.com/articles/what-microplastics-testing-proves/?utm_term=microplastics-verification-standard-explained&utm_campaign=ai_growth_agent) provide further detail on the pathway and its limits.

## Frequently Asked Questions

### What Is A Microplastics Verification Standard?

A microplastics verification standard is a defined set of criteria against which a company's existing laboratory data on plastic and microplastic content is independently reviewed. The review produces a bounded, scope-locked finding, which is a statement about what the data supports within the tested particle-size range, polymer panel, and production period. It is not a testing method and not a product certification. The Wellness Quality Institute's standard, WQI-CS-01, is aligned with the California State Water Board's drinking-water microplastics reference framework and specifies requirements for laboratory qualification, analytical method, polymer panel, reporting limits, contamination controls, and product scope.

### How Is A Verification Standard Different From A Testing Method Like ASTM D8401-24?

A testing method tells a laboratory how to run an analysis. ASTM D8401-24, for example, specifies how to use pyrolysis-gas chromatography/mass spectrometry to identify and quantify polymer types in water samples by mass. It produces an analytical result. A verification standard sits one layer above the method and defines the criteria an independent reviewer applies to determine whether a dataset produced using a qualified method supports a specific public claim. ASTM D8401-24 does not review datasets, issue verification decisions, produce registry entries, or supply approved claim language. Those functions belong to a verification program rather than a method standard.

### Does ISO 24187:2023 Set A Pass/Fail Threshold?

No. ISO 24187:2023, described above, sets general principles for microplastics analysis but no pass/fail threshold or product-certification scheme. Conformance to ISO 24187:2023 does not demonstrate that a product is below any health or environmental limit or that it is free of plastic.

### What Does A Lab Report Saying "No Microplastics Detected" Actually Mean?

"No microplastics detected" means no particles were found above the instrument's detection floor, for the polymers it screened, in the lot it tested. It does not mean none are present. A method validated above 50 µm cannot see anything smaller, and the California regulatory definition reaches down to 1 nanometer, thousands of times smaller than the best validated methods can reliably measure. As covered above, the 1–20 µm fraction is not validated under either California method, and the nanoplastic range is beyond reliable commercial measurement. A non-detect result is only meaningful when the reporting limit, polymer panel, and tested size range are stated alongside it.

### Is The Wellness Quality Institute Plastic-Free Pathway Verification A Certification?

No. The Wellness Quality Institute deliberately does not use the words "certified" or "certification" in connection with its program. A certification implies a settled, guaranteed state, and no such guarantee is scientifically available for plastic content. The Wellness Quality Institute's Plastic-Free Pathway Verification is an independent review of a company's existing laboratory dataset against defined criteria. It produces a verification decision: Standard Met or Standard Not Met. Standard Met means the dataset satisfied all applicable technical and data-quality requirements and no reportable target polymer particles were detected within the tested range and approved reporting limits. It does not mean the product is free of plastic.

## Conclusion: The Standard Is Not The Verification

Naming ISO 24187:2023 or ASTM D8401-24 is where verification begins, not where it ends. A method standard tells a laboratory how to run an analysis. It does not tell a brand what its data supports, what claim language is defensible, or where the boundary of a legitimate finding sits. The gap between a detection method and a defensible public claim is exactly where brands get exposed and where The Wellness Quality Institute operates.

That is what the Plastic-Free Pathway Verification does. It reviews the dataset, method, and product scope against published criteria, issues a Standard Met or Standard Not Met decision, and backs every Standard Met outcome with a registry entry and approved claim language. The difference from a raw lab report is the independent review in between.

A company on a verified pathway toward plastic-free standards has something a raw lab report cannot provide. An independent third party with no stake in the outcome and no role in the testing has reviewed the data against a published standard and issued language that stays inside what the evidence supports.

[Turn your existing lab data into a reviewed, scope-locked microplastics claim.](https://www.wellnessqualityinstitute.com/?utm_term=microplastics-verification-standard-explained&utm_campaign=ai_growth_agent)

## What to Read Next

- [How to Turn Lab Data Into a Microplastics Verification Claim](https://www.wellnessqualityinstitute.com/articles/microplastics-verification-standard-claim/?utm_term=microplastics-verification-standard-explained&utm_campaign=ai_growth_agent)
- [What Microplastics Testing Proves and Where It Stops](https://www.wellnessqualityinstitute.com/articles/what-microplastics-testing-proves/?utm_term=microplastics-verification-standard-explained&utm_campaign=ai_growth_agent)
- [Microplastics Lab Testing: Does Your Data Support A Claim?](https://www.wellnessqualityinstitute.com/articles/microplastics-lab-testing-verification-process/?utm_term=microplastics-verification-standard-explained&utm_campaign=ai_growth_agent)
- [Microplastics Claim Verification: A Claim-By-Claim Guide](https://www.wellnessqualityinstitute.com/articles/microplastics-claim-verification-data/?utm_term=microplastics-verification-standard-explained&utm_campaign=ai_growth_agent)
- [Why Most Plastic-Free Microplastics Claims Don’t Hold Up?](https://www.wellnessqualityinstitute.com/articles/water-quality-month-detection-limits/?utm_term=microplastics-verification-standard-explained&utm_campaign=ai_growth_agent)

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## Citations

- [Plastic Claim Substantiation: Evidence Before You Claim](https://www.wellnessqualityinstitute.com/articles/plastic-claim-substantiation-evidence-requirements)
- [How To Make Plastic Reduction Claims That Hold Up](https://www.wellnessqualityinstitute.com/articles/substantiate-clean-label-plastic-reduction)
- [Plastic Claim Substantiation: A US Compliance Guide](https://www.wellnessqualityinstitute.com/articles/plastic-claim-substantiation-compliance-guide)
- [Microplastics Verification Standards: A Complete Guide](https://www.wellnessqualityinstitute.com/articles/microplastics-verification-standards-guide)
- [What Microplastic Test Results Actually Mean](https://www.wellnessqualityinstitute.com/articles/what-microplastic-testing-actually-proves)

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