Turn Lab Data Into Verified Plastic-Free Claims: 6 Steps

Written by: Scott Steveson, Specialist

Key Takeaways

• A scope-locked plastic reduction claim spells out the numbers, the particle-size range, the polymer panel, the production period, and a registry ID that any buyer can check.

• The Wellness Quality Institute (WQI) acts as an independent verifier that turns raw lab data into clear claim language that reduces greenwashing risk under FTC Green Guides.

• Verification depends on a complete dataset package that includes lab qualification, validated methods, blank results, spike recoveries, replicates, and recent data tied to a specific production period.

• Claims must match the evidence. No method can confirm absence below its detection floor, so permitted language states exactly what was and was not measured.

• Learn more about removing plastic from your body and planet, or get verified plastic reduction claims for your company at The Wellness Quality Institute.

The Operational Gap: Real Lab Data Without Trusted Claim Language

Many US consumer brands already hold independent lab reports on plastic or microplastic content. They paid for testing, acted on the results, and made real progress. What they often lack is a trusted way to turn those numbers into claims that retailers, regulators, and consumers will accept.

This gap is structural. FTC Green Guides §260.9 treats “free-of” claims, including “plastic-free” or “microplastic-free,” as potentially deceptive if the product contains the substance, if a similar substance poses comparable environmental risks, or if the claim is not fully backed by evidence for all reasonable interpretations. Even a technically accurate lab result can become a greenwashing liability when the claim language stretches beyond what the data supports.

The litigation environment raises the stakes. US plastics-related lawsuits have increased sharply, including cases alleging that products marketed as “pure” contained microplastics. A 2026 Pollfish survey of 1,000 US adults found that 84% have seen sustainability claims and 53% felt unsure what those claims meant.

The solution is not more creative marketing copy. The solution is an independent review process that locks each claim to the specific evidence behind it.

Turn your existing lab data into defensible claims — start the WQI verification process.

Step 1: Establish a Quantified Baseline

A reduction claim needs a clear starting point. The baseline must be documented at the product level, including the specific SKU, the matrix (for example, bottled water), and the production period. Company-level or product-line averages do not provide a defensible basis for a claim about one product.

Extending one product’s result across a broader portfolio is one of the fastest ways a credible dataset turns into a greenwashing risk. California’s SB 54 source-reduction framework, which measures plastic reduction against a 2023 baseline by both component count and material weight, shows why product-level accounting matters. Marketing claims should match the exact product line, geography, time period, and packaging scope that were actually measured. SB 54 applies to California producers, yet its baseline approach offers a practical model for any brand that wants defensible reduction claims.

Step 2: Confirm Laboratory Method Suitability and Reporting Limits

Every product type needs a suitable lab method, and the detection floor, meaning the smallest particle size the instrument can reliably find, sets the outer boundary of any claim. A result that reads “no microplastics detected” means no particles were found above that instrument’s floor, using the polymers it screened, in the lot it tested. It does not prove that no microplastics are present.

The California State Water Board’s two published analytical methods show these limits in practice. SWB-MP1-rev1, which uses infrared spectroscopy, is validated for particles larger than 50 µm up to 5,000 µm. SWB-MP2-rev1, which uses Raman spectroscopy, reaches down to particles larger than 20 µm. California defines microplastics down to 1 nanometer, which is thousands of times smaller than either method can reliably detect. The 1–20 µm fraction is not validated under either method.

Inter-laboratory comparisons show extreme variability. That variability is why method suitability, not just the reported result, must be reviewed before any claim goes to market.

Step 3: Build a Complete, Reviewable Dataset Package

A single lab report does not qualify as a complete dataset. A reviewable submission includes lab qualification documents, the analytical method and its validated range, chain of custody records, blank results that show contamination controls, spike recoveries that prove the method can find plastic when added on purpose, replicates, and recent data tied to a specific production period.

Visual identification of particles alone never suffices. Counted particles, or an approved statistically valid subsample, must be chemically confirmed, usually by infrared or Raman spectroscopy, and reported by size fraction instead of as one combined number. Researchers have recommended reporting recovery performance, extraction efficiency, and staining selectivity alongside final microplastic counts so that concentration claims rest on solid ground.

Step 4: Map the Dataset to a Published Review Standard

Raw data becomes a defensible claim only after it is mapped to clear, published criteria. WQI’s governing standard, WQI-CS-01, sets a minimum target polymer panel. That panel includes polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), PVC, polyamide (PA), polycarbonate (PC), and polymethyl methacrylate (PMMA), with PE, PS, PVC, and PET as anchor polymers. The standard also requires reporting categories for other confirmed polymers and for unidentified particles with no spectral match.

The standard aligns with the California State Water Board’s drinking-water microplastics reference framework, which is currently the most stringent credible public reference for this type of testing. California did not create, approve, or endorse WQI or WQI-CS-01. The alignment reflects a technical choice, not a regulatory partnership.

The WHO’s 2019 assessment, Microplastics in Drinking-Water, found low concern on limited evidence and stressed that this conclusion rests on incomplete information, with more research urgently needed. That uncertainty is exactly why a defined, published standard is more reliable than an improvised internal threshold.

Step 5: Obtain an Independent Verification Decision

WQI reviews the complete dataset against WQI-CS-01 and issues one of two outcomes. Standard Met means the dataset satisfies all applicable technical and data-quality requirements and that no reportable target polymer particles are detected within the tested particle-size range and approved reporting limits. A non-detect result alone does not qualify. The reporting limits themselves must meet WQI requirements. Standard Not Met is a private outcome that is never described as a failed product, and the company can resubmit with updated information.

Standard Met unlocks a scope-locked license to use the WQI mark, “WQI Plastic-Free Pathway Verified,” together with approved claim language, a public registry listing, and a registry ID. Because the mark represents verified evidence rather than an absolute state, it may not appear as a standalone product claim and must link to the Verification Scope record that shows exactly what was tested. This scope-locking is also why the mark does not imply plastic-free, microplastic-free, nanoplastic-free, zero plastic, California approval, government certification, or any health or safety certification.

A single assessment fee covers the review, verification decision, and registry listing. There is no separate mark-license or registry fee. Independent lab testing is arranged and billed separately. Paying the assessment fee does not guarantee a verification decision.

Get registry-backed plastic reduction claims for your products — talk to WQI about Plastic-Free Pathway Verification.

Step 6: Keep the Claim Current With 24-Month Re-Verification

The verification period lasts 24 months from the sampling date of the most recent accepted dataset. Continued claim use after that date requires re-verification with current data. Expired registry entries remain visible and marked “Expired,” so the public record stays honest over time instead of quietly disappearing.

This cycle reflects a hard technical reality. A clean result on one production lot does not guarantee the next lot. Lot-to-lot variability interacts with particle-size limits below any method’s detection floor and with polymer diversity across product formats. Together, these factors explain why no product can be certified plastic-free and why ongoing re-verification is required.

Verification-Readiness Checklist

The following checklist highlights the five most common reasons datasets fail verification and the specific evidence that prevents each problem before submission.

Requirement	Typical Failure Mode	Evidence Needed	Pass / Fail Indicator
Laboratory qualification (California ELAP preferred; ISO/IEC 17025 with method and matrix in scope accepted)	Laboratory accreditation does not explicitly cover the microplastics method or the product matrix	Current accreditation certificate with method and matrix listed in scope	Fail if accreditation scope excludes the applicable method or matrix
Analytical method validated for the product matrix and particle-size range (≥20 µm for Raman; ≥50 µm for infrared)	Method applied outside its validated range; visual-only identification without chemical confirmation	Method SOP with validated detection range; spectroscopic confirmation records for counted particles	Fail if detection floor exceeds WQI reporting-limit requirements or chemical confirmation is absent
Blank and contamination controls (procedural blanks run at defined frequency; blank data reported)	Blanks omitted or not reported; lab environment not plastic-free during sample preparation	Blank results reported by size fraction; documentation of plastic-free sample-preparation environment	Fail if blank data is absent or blank counts are not subtracted from sample results
Minimum polymer panel (PE, PP, PET, PS, PVC, PA, PC, PMMA; plus reporting categories for other confirmed polymers and unidentified particles)	Panel covers fewer than the required polymers; unidentified particles not reported separately	Polymer identification report listing all screened types and any unmatched spectra	Fail if any anchor polymer (PE, PS, PVC, PET) is absent from the screened panel or unidentified particles are not reported
Data recency and production-period documentation	Dataset older than 24 months from sampling date; production period not specified	Chain of custody with sampling date; production lot or period identifier linked to the dataset	Fail if sampling date exceeds 24-month window or production period is unspecified

Permitted Versus Prohibited Claim Language

The following table shows four common claim types and the exact phrasing that keeps each claim within the evidence versus the prohibited language that overstates it. Use this as a reference when drafting any plastic-related marketing copy.

Claim Type	Prohibited Phrasing	Permitted Phrasing	Why the Distinction Matters
Absence claim	“Plastic-free” · “Microplastic-free” · “Zero plastic” · “No microplastics”	“No reportable target polymers detected within the tested particle-size range (≥20 µm) and approved reporting limits, for [Product Name], [production period] — WQI Registry ID [XXXXX]”	No method can confirm absence below its detection floor, so the permitted phrasing states exactly what was and was not measured
Reduction claim	“We’ve eliminated microplastics from our water” · “100% microplastic reduction”	“Measured [X]% reduction in particles ≥20 µm across the reviewed polymer panel, [Product Name], [production period vs. baseline period] — WQI Registry ID [XXXXX]”	FTC Green Guides §260.3(c) prohibit overstating environmental attributes, so a reduction rounded to 100% or restated as “eliminates” is prohibited under WQI-CS-01
Verification status	“Certified plastic-free” · “California-approved” · “Government certified”	“WQI Plastic-Free Pathway Verified — dataset reviewed against a standard aligned with the California State Water Board’s drinking-water microplastics reference framework”	California has not endorsed WQI, and “certified” implies a guaranteed state that current science cannot support
Scope extension	“Our entire product line is verified plastic-free” · “All our water is microplastic-tested”	“[Specific SKU], [specific production period], verified under WQI Plastic-Free Pathway Verification — see registry for full scope”	Verification applies only to the reviewed product, dataset, tested range, polymer panel, and production period, so no company-wide or product-line claim may be extended from a single dataset

Lifecycle Honesty and Trade-Off Disclosure

A scope-locked claim is honest about what it does not cover. The OECD’s Global Plastics Outlook reports that global plastics production roughly doubled from 234 million tonnes in 2000 to about 460 million tonnes in 2019, with production, use, and waste projected to rise a further 70% by 2040 on current trajectories. In that context, a product-level reduction claim matters only when it is clear about its boundaries.

Regulatory guidance consistently warns that marketing claims should match the exact product line, geography, time period, and packaging scope that were measured. A claim that hints at broader benefits than the evidence supports, such as implying that packaging changes address microplastic content in the product itself, counts as a trade-off omission that regulators and litigants treat as deceptive.

WQI-CS-01 requires that every Standard Met outcome clearly state what the verification does not establish. That list includes absence of plastic below the method floor, outside the tested range, outside the reviewed polymer panel, below the reporting limit, outside the registered product scope, or outside the registered production period.

How Procurement Teams Use the Public Registry

Every Standard Met product receives a public registry entry that records the verified party, product scope, matrix, production or sampling period, tested particle-size range, lower method limit, polymer panel, reporting limits, testing lab and its accreditation reference, verification date, expiration date, registry ID, approved result statement, and current status. Permitted statuses are Active, Suspended, Expired, and Withdrawn.

Procurement teams and retailers can check the registry ID against the claim on packaging instead of relying on the brand’s word alone. Expired entries stay visible and marked “Expired,” so the record remains honest over time. This transparency converts a claim from something that can be asserted into something that can be checked, which is what separates a scope-locked verification from a self-reported lab result.

A June 2026 RTI International analysis highlighted rising awareness of microplastics and a shift toward personal-health concerns, and concluded that organizations can build trust through clear, science-based communication. A public registry entry delivers that communication in a way anyone can verify.

Measuring Process Quality Through Documentation Completeness

The strength of a plastic reduction claim depends on the strength of the documentation behind it. Studies of table salt dissolved in water have reported microplastic concentrations ranging from 0 to over 39,800 particles per kilogram of salt, largely because of differences in filter pore sizes used during separation. That spread shows how method choices, not product differences, can drive result variability.

Documentation completeness is the practical test of whether a dataset can support a claim. The issues that most often cause a Standard Not Met outcome usually reflect documentation gaps, not bad products. Common problems include incomplete blanks, missing chain of custody, methods used outside their validated range, or polymer panels that omit anchor types. Many companies first learn what their existing data does and does not prove during the WQI review.

Find out if your current dataset meets WQI verification requirements.

Frequently Asked Questions

How long does the WQI verification process take, and what does it cost?

The timeline depends on how complete the submitted dataset is. A complete submission that includes lab qualification documents, method records, blank data, chain of custody, and polymer identification results moves through review faster than a submission that needs follow-up for missing pieces. A single assessment fee covers the review, verification decision, and registry listing. There is no separate mark-license or registry fee. Independent lab testing is arranged and billed separately by a qualified independent lab. Paying the assessment fee does not guarantee a verification decision.

What happens if the submitted data does not meet the standard?

A Standard Not Met outcome remains private. It carries no public claim, no logo rights, and no registry listing, and it is never described as a failed product. The outcome often reflects the testing approach rather than the product itself, such as an unsupported method, reporting limits below WQI requirements, incomplete blank data, or an incomplete polymer panel. The company can submit corrected or additional information for future review. Participating in the process creates no public downside risk.

Does WQI verification replace legal or advertising-claims review?

No. Companies remain responsible for making sure all product, packaging, and marketing claims are accurate and properly supported under applicable law, including FTC Green Guides requirements for competent and reliable scientific evidence. WQI verification is an independent review of a dataset against a defined standard. It is not legal, regulatory, or advertising-claims counsel, and it does not replace those functions. WQI provides approved claim language and a press kit with clear lists of permitted and prohibited phrasing so that the compliant version is the easy version, but legal review of final packaging and marketing copy remains the brand’s responsibility.

How is scope enforced, and what happens if a brand extends the claim beyond the registered scope?

Verification applies only to the reviewed product, model or SKU, matrix, production or sampling period, analytical method, tested particle-size range, polymer panel, reporting limits, and supporting controls. No company-wide or product-line claim may be extended from a single dataset. Claims that extend beyond the registered scope are prohibited under WQI-CS-01 and may result in suspension, withdrawal of verification, a registry status change to Suspended or Withdrawn, and termination of mark-use rights. The public registry makes these scope boundaries independently checkable by any buyer, retailer, or journalist.

Can WQI verification be adapted as a company adds new product matrices or formats?

Phase 1 of WQI’s Plastic-Free Pathway Verification focuses on water and suitable simple-liquid products, where testing methods are most defensible. Each new product, SKU, or matrix requires its own submission and review. A single verified product’s result cannot be extended to a new format. As analytical methods mature and validated protocols become available for additional matrices, WQI’s scope may expand. Companies that plan a verification program across a portfolio should expect separate submissions per product and production period, each with its own registry entry and scope-locked claim language.

What does “WQI Plastic-Free Pathway Verified” actually mean on packaging?

The mark means that the company’s lab dataset for the specific verified product was independently reviewed against WQI-CS-01, a standard aligned with the California State Water Board’s drinking-water microplastics reference framework, and met all applicable technical and data-quality requirements. “Plastic-Free” describes the direction of travel, not a state the product has fully reached. “Pathway” is the key word because it signals progress along a route rather than arrival at a final destination. “Verified” describes WQI’s role, which is to review a dataset against a defined standard. For a complete list of what the mark does not imply, see the verification scope requirements in Step 5. The key point is that “Pathway” signals progress toward a standard, not a guarantee of zero plastic.

Conclusion: Turn Existing Data Into Registry-Backed Claims

The gap between a lab report and a defensible market claim is a process gap, not a data gap. Brands that already commissioned independent testing have done the hard work. An independent review against a published standard, locked to the exact evidence and backed by a public registry ID, converts that investment into a claim that can withstand retailer diligence, legal review, and consumer scrutiny.

A 2018 peer-reviewed study by Kosuth, Mason, and Wattenberg in PLOS ONE found anthropogenic particles in 81% of 159 tap water samples across five continents. A separate 2018 study led by Sherri Mason at SUNY Fredonia, published in Frontiers in Chemistry, found microplastics in 93% of 259 bottled water samples across eleven brands, with polypropylene, the material used in many bottle caps, as the most common polymer identified. As the WHO noted in its 2019 assessment, the evidence base remains incomplete, which is precisely why measurement and claim infrastructure matter.

WQI exists to bridge that gap. Its differentiator lies not only in what it supports but also in what it refuses to claim.

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.

Get registry-backed plastic reduction claims for your products.