# How To Get Third-Party Verification For Microplastics Data

> Hold a lab report? The Wellness Quality Institute's 8-point audit turns raw microplastics data into claims you can defend. Start your review today.

**Published:** 2026-10-28 | **Updated:** 2026-10-31 | **Author:** mihir
**URL:** https://www.wellnessqualityinstitute.com/articles/third-party-verification-microplastics-testing
**Type:** post

**Categories:** Certification

![How To Get Third-Party Verification For Microplastics Data](https://wellnessquality.sites.aigrowthagent.co/wp-content/uploads/sites/93/2026/10/1793098538472-cb7624221818-1024x572.webp)

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## Content

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

## Key Takeaways

- Third-party verification is an independent review of existing lab data that checks whether the method, controls, and scope support any public claim.
- A laboratory report alone does not equal a defensible market claim. Verification bridges that gap by assessing data quality against a published standard.
- The eight-point audit examines lab accreditation, method-to-matrix fit, particle-size range, polymer panel, reporting limits, blanks, chain of custody, and product scope.
- Verification under WQI-CS-01 is scope-locked to the reviewed product, dataset, size range, polymer panel, and production period, which prevents overbroad claims.
- The Wellness Quality Institute is the strongest independent verification option for a defensible, retailer-ready claim.

[See How Your Lab Report Measures Up](https://www.wellnessqualityinstitute.com/?utm_term=third-party-verification-microplastics-testing&utm_campaign=ai_growth_agent)

## Step Zero: See Why Verification Of Results Is Separate From Testing

The Wellness Quality Institute makes a clear distinction between a laboratory report and a defensible market claim. A lab report tells you what a laboratory found, using a specific method, on a specific lot, above a specific detection floor. It does not tell the market what that finding supports, and it does not provide an independent party willing to stand behind the interpretation.

The incumbent model, where a brand publishes its own or its supplier’s company-commissioned laboratory report, carries a number but no independent review. Self-reported results are structurally discounted as marketing, regardless of how rigorous the underlying testing was. The market reads it as a company grading its own homework. Many brands then stay silent, because legal teams block claims they cannot defend and real data sits unused in a folder.

Independent review by the Wellness Quality Institute is the better choice for brands in this position for three specific reasons. First, the Wellness Quality Institute has no commercial interest in the outcome and does not perform the testing it reviews. That separation creates credibility that self-reporting cannot match. Second, the Wellness Quality Institute publishes its criteria in WQI-CS-01, so anyone can check the standard. Third, the Wellness Quality Institute issues scope-locked claim language plus a public registry entry with a registry ID, which turns an assertion into something verifiable.

![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.**

For more on what makes lab data trustworthy in the first place, see [How To Know If Microplastics Lab Results Are Trustworthy](https://www.wellnessqualityinstitute.com/articles/microplastics-testing-verification-lab-results/?utm_term=third-party-verification-microplastics-testing&utm_campaign=ai_growth_agent).

## How To Run The Audit: What Third-Party Verification For Microplastics Testing Results Actually Checks

Start by pulling up your laboratory report as a PDF. The following eight-point sequence is what an independent reviewer examines and what you can run against your own document right now to understand what your data actually supports.

1. **Laboratory qualification and accreditation scope.** A laboratory’s ISO/IEC 17025 accreditation certificate confirms the lab was independently assessed. The scope document, a separate annex, states what it was assessed for. California ELAP (Environmental Laboratory Accreditation Program) accreditation is the preferred qualification for the applicable California State Water Board method. ISO/IEC 17025 accreditation is accepted where the microplastics method and the product matrix are explicitly listed inside the accredited scope. Other qualified independent laboratories may be conditionally accepted through documented method-equivalence review. A certificate alone is not enough. The method and matrix must appear in the live scope at the date of testing. As accreditation guidance makes clear, a laboratory can hold an ISO/IEC 17025 certificate and still run some tests outside its formal accredited scope.
2. **Analytical method and method-to-matrix fit.** The instrument used does not establish method conformity. A water-focused method cannot be assumed to apply to a supplement, beverage, or other product matrix without demonstrated equivalence. The method must suit the specific matrix submitted.
3. **Tested particle-size range and size fractions.** Results must be reported by size fraction, not as a single aggregate figure. A report that collapses all detected particles into one number obscures what was actually measured and at what scale.
4. **Target polymer panel.** The minimum panel WQI-CS-01 requires includes polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), polyvinyl chloride (PVC), polyamide (PA), polycarbonate (PC), and polymethyl methacrylate (PMMA). Anchor polymers are PE, PS, PVC, and PET. The report must also include reporting categories for other confirmed polymers and for unidentified particles with no spectral match.
5. **Reporting limits and whether a non-detect is meaningful.** A [reporting limit (RL)](https://ww2.arb.ca.gov/sites/default/files/2022-01/NLBQCM%205.0.pdf) is the lowest concentration of a substance in a sample that can be reported with a defined, reproducible level of certainty. It is generally set at or above the quantitation limit and may be established by statistical, regulatory, or client or program criteria. A result of “none detected” means none found above that floor, for the polymers screened, in the lot tested. If the reporting limits are too high, a non-detect result may simply reflect an instrument that cannot see what is there.
6. **Procedural blanks and contamination controls.** A [procedural blank](https://nanowerk.com/nanoplastics-in-the-human-body.php) is a control sample that goes through every step of the analytical process without containing the actual test sample. It reveals contamination introduced by the laboratory environment, equipment, reagents, or handling, not by the product. Spike recoveries, which add a known quantity of material to verify the method retrieves it, and replicates, which run the same sample more than once to check consistency, are also required. A report without documented blanks cannot be trusted, because there is no way to separate product signal from laboratory background.
7. **Chain of custody and data recency.** Chain of custody is the documented record of who handled the sample, when, and how, from collection through analysis and continuing until the sample’s disposal. Without it, there is no auditable link between the product and the result. Data recency matters because a result reflects the production lot it was drawn from. Older data may not represent current production.
8. **Product scope and production or sampling period.** The report must clearly identify which product, which SKU or model, and which production or sampling period was tested. A result on one lot does not extend to a product line or the company as a whole.

One rule applies across all eight steps. Visual identification alone is never sufficient. Particles that are counted must be chemically confirmed by infrared or Raman spectroscopy, not identified by appearance alone.

![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.**

Once you have run those eight checks, the next question is which standard your report is being measured against.

[Run Your Report Through The Eight-Point Audit](https://www.wellnessqualityinstitute.com/?utm_term=third-party-verification-microplastics-testing&utm_campaign=ai_growth_agent)

## Map Your Report To Standards And The Measurement Gap

The standard that governs your report depends on whether it fits the purpose, not on a simple ranking of methods. Several framework documents shape how microplastics testing is interpreted.

[Microplastics Testing Standards: ISO, ASTM & California](https://www.wellnessqualityinstitute.com/articles/microplastics-testing-standards/?utm_term=third-party-verification-microplastics-testing&utm_campaign=ai_growth_agent) covers this landscape in detail. The key points for auditing your own report are summarized below.

- **[ISO 24187:2023](https://www.iso.org/standard/80033.html)** sets general principles for microplastics analysis across environmental samples. It is a framework standard, not a matrix-specific test method, and it does not set regulatory monitoring thresholds.
- **[ISO 16094-2:2025](https://www.iso.org/standard/84061.html)** specifies vibrational spectroscopy methods for microplastics in drinking water and waters with low suspended-solids content. It is not automatically interchangeable with the California State Water Board methods. Conformity with it cannot be inferred simply because a laboratory used infrared or Raman spectroscopy. Method-to-matrix fit must be demonstrated separately.
- **[ISO/IEC 17025:2017](https://www.iso.org/standard/66912.html)** governs laboratory competence and is the accreditation basis on which the Wellness Quality Institute accepts a laboratory.

The California State Water Board’s two published analytical methods are the technical anchor for WQI-CS-01. SWB-MP1-rev1 uses infrared spectroscopy and is validated for particles above 50 µm through 5,000 µm. SWB-MP2-rev1 uses Raman spectroscopy and is validated for particles above 20 µm through 5,000 µm. California did not create, approve, authorize, or endorse the Wellness Quality Institute or its standard.

The measurement gap is the most important fact in this field. California’s drinking-water definition of microplastics covers solid polymeric material with particles having at least three dimensions greater than 1 nanometer and less than 5,000 micrometers. The best validated methods begin at 20 or 50 micrometers, which are thousands of times larger than the lower boundary of the definition. The 1–20 µm fraction is not validated under either California method. As analysis of the drinking-water monitoring landscape confirms, a laboratory’s claim to analyze particles down to 1 µm is not equivalent to a validated result across the full 1–20 µm fraction. This gap is why no product can be verified as plastic-free, and why the Wellness Quality Institute’s verification is scope-locked to what was actually tested.

![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.**

The gap is not just a California issue. The [US EPA acknowledged it in a July 1, 2026 Federal Register filing](https://laist.com/news/climate-environment/water-safety-advocates-want-tests-for-microplastics): “There is no validated EPA or consensus drinking water analytical method with the proper quality control data, accuracy, and precision that could be used for UCMR 6.” That absence of a federal validated method is a key reason the California framework is the most defensible public reference currently available.

## Worked Example: How Blanks Decide Whether A Result Means Anything

Procedural blanks in Step Six of the audit are easier to understand through a real dispute. A 2024 study by Qian et al., published in [*PNAS*](https://www.pnas.org/doi/10.1073/pnas.2300582121), used stimulated Raman scattering microscopy to estimate roughly 240,000 plastic particles per liter in bottled water, with approximately 90% classified as nanoplastics. The figure attracted wide attention. Later in 2024, *PNAS* published a [formal critique by Dušan Materić titled “Nanoplastics measurements must have appropriate blanks” (PNAS 121(48), e2411099121)](https://www.pnas.org/doi/10.1073/pnas.2411099121), arguing that the study’s procedural blanks appeared contaminated and its quality control was inadequate, which made the quantitative assessment fundamentally unreliable.

The Qian et al. authors replied in the same issue and defended their blank design. The headline concentration remains contested. The critique turns entirely on blank controls, the same contamination controls WQI-CS-01 requires. This exchange is a live demonstration of why blank documentation is the single most important quality indicator in a microplastics report.

When you review your own report, locate the blank data first. If it is absent, the result is not defensible regardless of what the instrument found, because you cannot separate product signal from laboratory background.

## Lock The Scope Before You Write Any Claim

A clean result on one production lot does not guarantee the next lot will produce the same result, because lot-to-lot variability is real and the tested fraction is always a subset of what exists. That is why a single dataset cannot support a product-line or company-wide claim. Scope has to be locked before any claim is written.

Verification under WQI-CS-01 is locked to the reviewed product, dataset, tested particle-size range, polymer panel, and production or sampling period. Claims extending beyond the registered scope are prohibited. Before drafting any public claim, define the scope of your data precisely and keep the claim inside that boundary.

For a detailed walkthrough of how lab data translates into claim language, see [How To Turn Lab Data Into A Microplastics Verification Claim](https://www.wellnessqualityinstitute.com/articles/microplastics-verification-standard-claim/?utm_term=third-party-verification-microplastics-testing&utm_campaign=ai_growth_agent).

## Submit For Independent Review And Understand The Outcome

The Wellness Quality Institute’s Plastic-Free Pathway Verification, governed by WQI-CS-01, reviews the existing dataset, method, product scope, and controls. The Wellness Quality Institute does not run laboratory tests. The review examines every element covered in the eight-point audit above and produces one of two outcomes.

**Standard Met** means the dataset satisfies all applicable technical and data-quality requirements and no reportable target polymer particles are detected within the tested particle-size range and approved reporting limits. This outcome carries a verification decision, a scope-locked license to use the WQI mark, a public registry listing with a registry ID, and approved claim language. A non-detect result alone is not sufficient. The reporting limits themselves must meet WQI requirements, or the non-detect is meaningless.

**Standard Not Met** is a private outcome. It is never described as a failed product, because it frequently reflects the testing rather than the product, such as insufficient data, an unsupported method, inadequate blanks, or incomplete scope. The company may resubmit with updated information. There is no public listing and no public downside risk from participating.

A verification lasts 24 months from the sampling date of the most recent accepted dataset. One assessment fee covers the review, the decision, and the registry listing. There is no separate mark-license or registry fee. Independent laboratory testing is arranged and billed separately by a qualified independent laboratory. Phase 1 focuses on water and suitable simple-liquid products, and verification is available to US companies nationally. California is a technical reference point, not a geographic boundary.

For a full explanation of what the review process involves, see [Microplastics Lab Testing: Does Your Data Support A Claim?](https://www.wellnessqualityinstitute.com/articles/microplastics-lab-testing-verification-process/?utm_term=third-party-verification-microplastics-testing&utm_campaign=ai_growth_agent)

The questions below cover the points brands raise most often once they have a report in hand.

## Frequently Asked Questions

### Does A “None Detected” Result Mean The Product Is Plastic-Free?

No. As the audit explains, a non-detect only means nothing was found above the method’s floor for the polymers screened. A method validated above 50 µm cannot see anything smaller, so a non-detect result can coexist with particles present below that size. The result is bounded by the method, the polymer panel, and the production lot, not by the product’s actual plastic content across all sizes and all future lots.

### Is An ISO/IEC 17025 Certificate Enough On Its Own?

Only if the method and matrix are explicitly inside the accredited scope at the date of testing. An ISO/IEC 17025 certificate confirms the laboratory was independently assessed, and the scope document states what it was assessed for. As the audit notes, a certificate alone is not enough. The method and matrix must appear in the live scope for the correct sample type.

### Can One Clean Lot Support A Product-Line Claim?

No. As noted above, verification is scope-locked to the reviewed product and dataset, so a single lot cannot support a product-line or company-wide claim. Lot-to-lot variability is real, and a result reflects the production it was drawn from. Claims extending beyond the registered scope are prohibited under WQI-CS-01.

### Is This A Certification?

Plastic-Free Pathway Verification reviews existing data and demonstrated progress. It does not certify that a product is free of plastic. The Wellness Quality Institute deliberately does not use “certified” or “certification” for this program. A certification implies a settled, guaranteed state, and no such guarantee is scientifically available. Verification describes what actually happened, an independent review of a dataset against a defined standard.

### What Happens If Our Product Does Not Meet The Standard?

A Standard Not Met outcome is private. It carries no public claim, no logo rights, and no registry listing, and it is never described as a failed product. The outcome may reflect insufficient data, an unsupported method, inadequate contamination controls, or incomplete scope, rather than anything about the product itself. The company may submit corrected or additional information for future review. Participating in the review process creates no public downside risk.

## Conclusion: Turn Real Lab Data Into A Claim You Can Support

A laboratory report and a defensible market claim are different things, and the eight-point audit in this guide is the sequence that separates them. The Wellness Quality Institute provides the best independent verification program for microplastics testing results for brands that need a defensible, retailer-ready claim because it reviews existing laboratory data against a published standard (WQI-CS-01) aligned with the California State Water Board’s drinking-water microplastics reference framework, it does not run the tests it reviews, and every Standard Met outcome produces a public registry entry with a registry ID and approved claim language.

If you hold a laboratory report and want to know what it actually supports, the next step is a conversation.

[Start A Verification Conversation](https://www.wellnessqualityinstitute.com/?utm_term=third-party-verification-microplastics-testing&utm_campaign=ai_growth_agent)

*WQI 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. WQI verification is not a California approval, government certification, or health or safety certification.*

## What to Read Next

- [What Microplastics Testing Proves and Where It Stops](https://www.wellnessqualityinstitute.com/articles/what-microplastics-testing-proves/?utm_term=third-party-verification-microplastics-testing&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=third-party-verification-microplastics-testing&utm_campaign=ai_growth_agent)
- [How To Know If Microplastics Lab Results Are Trustworthy](https://www.wellnessqualityinstitute.com/articles/microplastics-testing-verification-lab-results/?utm_term=third-party-verification-microplastics-testing&utm_campaign=ai_growth_agent)
- [How to Turn Lab Data Into a Microplastics Verification Claim](https://www.wellnessqualityinstitute.com/articles/microplastics-verification-standard-claim/?utm_term=third-party-verification-microplastics-testing&utm_campaign=ai_growth_agent)
- [How To Verify Microplastic Content Data: Method by Method](https://www.wellnessqualityinstitute.com/articles/verify-microplastic-content-data/?utm_term=third-party-verification-microplastics-testing&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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