# ISO 24187 Microplastics Framework Alignment Explained

> Understand ISO 24187 microplastics alignment. The Wellness Quality Institute delivers independent verification for defensible, audit-ready results.

**Published:** 2026-10-19 | **Updated:** 2026-10-31 | **Author:** mihir
**URL:** https://www.wellnessqualityinstitute.com/articles/microplastics-reference-framework-alignment
**Type:** post

**Categories:** Certification

![ISO 24187 Microplastics Framework Alignment Explained](https://wellnessquality.sites.aigrowthagent.co/wp-content/uploads/sites/93/2026/10/1792330392410-74825e0376ff-1024x572.webp)

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## Content

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

## Key Takeaways

- Microplastics framework alignment is a written map that shows which standard governs each workflow stage, plus any justified deviations and gaps.
- No single framework covers the full workflow. Alignment uses ISO 24187:2023, ISO 5667-27:2025, California SWB-MP1/SWB-MP2, and ISO/IEC 17025:2017, with clear notes on what each standard leaves open.
- The 1–20 µm fraction and the nanoplastic range below 1 µm set hard alignment limits, because the California definition reaches 1 nm while validated methods start at 20 µm or 50 µm.
- Documented, technically justified, and authorized deviations can remain acceptable when paired with compensating controls under ISO/IEC 17025:2017.
- The Wellness Quality Institute turns aligned microplastics datasets into defensible claims through its Plastic-Free Pathway Verification program.

[Talk to WQI About Plastic-Free Pathway Verification](https://www.wellnessqualityinstitute.com/?utm_term=microplastics-reference-framework-alignment&utm_campaign=ai_growth_agent)

## The Alignment Matrix: Workflow Stage to Governing Standard

Alignment works as a composite map with known gaps, because no single framework covers the full microplastics workflow. The table below links each workflow stage to its primary governing standard, what that standard covers, and what it leaves open. Read the last column first, because every row contains a gap where alignment risk lives.

| Workflow Stage | Governing Standard or Method | What It Covers | What It Leaves Open |
| --- | --- | --- | --- |
| Definitions | [ISO 24187:2023](https://www.iso.org/standard/78613.html); California State Water Board drinking-water definition | Size classification (macroplastics, mesoplastics, microplastics 1 µm–5 mm, nanoplastics <1 µm); regulatory definition (>1 nm to <5,000 µm across at least three dimensions) | No single definition governs all matrices; the California definition is broader than any validated method can reach |
| Sampling | [ISO 5667-27:2025](https://www.iso.org/standard/85557.html) | Grab sampling, cascade filtration, net sampling; preservation, handling, transport, storage; field blanks, replicates, geospatial documentation | Explicitly excludes chemical analysis, digestion, and identification; a sampling-aligned protocol must separately map downstream stages |
| Sample Preparation | [ISO 24187:2023](https://www.iso.org/standard/78613.html) (general principles) | Matrix interference removal; particle concentration; subsampling documentation requirements | No matrix-specific preparation SOP; method-specific suitability must be demonstrated separately |
| Identification | [SWB-MP1-rev1](https://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/documents/microplastics/swb-mp1-rev1.pdf) (infrared/FT-IR, meaning Fourier-transform infrared spectroscopy, >50 µm); [SWB-MP2-rev1](https://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/documents/microplastics/swb-mp2-rev1.pdf) (Raman, >20 µm); [ISO 16094-2:2025](https://www.iso.org/standard/85557.html) | Polymer identification by vibrational spectroscopy within validated size ranges; visual microscopy for counting | 1–20 µm fraction unvalidated under both California methods; nanoplastic range (<1 µm) beyond reliable commercial measurement; LDIR (laser direct infrared) and GC-MS (gas chromatography–mass spectrometry) not covered by these SOPs |
| Quantification | [SWB-MP1-rev1](https://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/documents/microplastics/swb-mp1-rev1.pdf); [SWB-MP2-rev1](https://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/documents/microplastics/swb-mp2-rev1.pdf) | Particle count by size fraction; reporting bins; visual confirmation requirements | Mass-based results from pyrolysis GC-MS are not interchangeable with particle-count results without documented conversion assumptions |
| QA/QC | [ISO/IEC 17025:2017](https://www.iso.org/standard/66912.html); [ISO 5667-27:2025](https://www.iso.org/standard/85557.html) (field blanks) | Method validation, deviation authorization, blank controls, spike recoveries, proficiency testing, corrective action | No microplastics-specific proficiency scheme exists for most matrices; laboratories must document justification and substitute alternatives |
| Reporting | [ISO 24187:2023](https://www.iso.org/standard/78613.html); [SWB-MP1-rev1](https://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/documents/microplastics/swb-mp1-rev1.pdf)/[SWB-MP2-rev1](https://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/documents/microplastics/swb-mp2-rev1.pdf); JRC 2024 analytical methods review | Particle number by size class; subsampling fraction and scaling factor; polymer identity; blank data | No universal reporting template; mass versus number results require explicit labeling; the JRC (European Commission Joint Research Centre) review notes that harmonization remains incomplete |

[*Microplastics Methodology Validation: A Practical Guide*](https://www.wellnessqualityinstitute.com/articles/microplastics-testing-methodology-validation/?utm_term=microplastics-reference-framework-alignment&utm_campaign=ai_growth_agent) explains how to prove analytical performance. This article focuses on the alignment crosswalk and the deviation record.

[Have Your Alignment Matrix Reviewed Against WQI-CS-01](https://www.wellnessqualityinstitute.com/?utm_term=microplastics-reference-framework-alignment&utm_campaign=ai_growth_agent)

## What ISO 24187:2023 Covers and Where It Stops

[ISO 24187:2023](https://www.iso.org/standard/78613.html), titled “[Principles for the Analysis of Microplastics Present in the Environment](https://committee.iso.org/cms/live/live/ru/sites/isoorg/contents/data/committee/65/78/6578018/x/catalogue),” sets general rules for particle-based microplastics analysis in water, sediment, and biota. It classifies plastic debris by size into [macroplastics (>25 mm), mesoplastics (5–25 mm), microplastics (1 µm–5 mm), and nanoplastics (<1 µm)](https://mdpi.com/1420-3049/31/16/2789). It also covers sample preparation basics, subsampling documentation, and the need to record the measured fraction, scaling factor, and uncertainty.

ISO 24187:2023 does not name a single approved method. Laboratories must show that each chosen method suits the matrix and instrument. The standard works as a principles-level baseline rather than a step-by-step operating procedure, and it does not replace the California State Water Board’s method-specific SOPs, meaning standard operating procedures. Organizations outside California often treat the California methods as a strong technical reference point, because they are currently the most demanding public methods for drinking water.

## Aligning Sampling Under ISO 5667-27:2025

[ISO 5667-27:2025](https://www.iso.org/standard/85557.html), “[Water Quality — Sampling — Part 27: Guidance on Sampling for Microplastics in Water](https://ecommerce.sist.si/catalog/standards/sist/2c3a07b3-ab99-416c-b54f-deca1c7b1bb4/sist-iso-5667-27-2026),” sets out how to collect water samples that contain suspended microplastics. It applies to domestic water, freshwater, seawater, treated wastewater, and untreated wastewater. It covers grab sampling, [cascade filtration across three suspended-solids tiers (low 1–100 mg/L, medium 100–500 mg/L, high >500 mg/L)](https://ecommerce.sist.si/catalog/standards/sist/2c3a07b3-ab99-416c-b54f-deca1c7b1bb4/sist-iso-5667-27-2026), and net sampling. It also [requires field blanks, replicates, geospatial documentation, and records of sampler competence and equipment calibration](https://ecommerce.sist.si/catalog/standards/sist/2c3a07b3-ab99-416c-b54f-deca1c7b1bb4/sist-iso-5667-27-2026).

Sampling is often where alignment breaks down. [ISO 5667-27:2025 explicitly excludes chemical analysis, digestion, and identification](https://ecommerce.sist.si/catalog/standards/sist/2c3a07b3-ab99-416c-b54f-deca1c7b1bb4/sist-iso-5667-27-2026). A protocol aligned to this standard still needs a separate map for identification and quantification. The standard also [states that sampling methods for microplastics in water remain imprecise and that no universal protocol exists yet](https://ecommerce.sist.si/catalog/standards/sist/2c3a07b3-ab99-416c-b54f-deca1c7b1bb4/sist-iso-5667-27-2026). Alignment at this stage therefore reflects best available practice rather than a fully settled method.

## ISO 24187 and California SWB Methods: How They Compare

Sampling has its own standard, while identification and quantification still rely on a mix of approaches. That difference is where the ISO and California paths diverge most clearly. [ISO 24187:2023](https://www.iso.org/standard/78613.html) is a principles-based international standard that describes what particle-based microplastics analysis should achieve across matrices without naming a single approved method or size range. The [California State Water Board’s SWB-MP1-rev1](https://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/documents/microplastics/swb-mp1-rev1.pdf) and [SWB-MP2-rev1](https://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/documents/microplastics/swb-mp2-rev1.pdf) are [method-specific SOPs](https://filterdwaterguide.com/microplastics-in-drinking-water) with validated ranges, approved instruments, and a regulatory definition tied to drinking water. The California methods give detailed instructions where ISO 24187:2023 sets broad expectations.

[ISO 16094-2:2025](https://www.iso.org/standard/85557.html) covers vibrational spectroscopy for microplastics in waters with low suspended solids, including drinking water. It can serve as an analytical reference when the method, matrix, laboratory validation, and equivalence review all support that choice. It does not automatically replace the California methods. Any organization using ISO 16094-2:2025 still needs a written equivalence review that shows the method fits the matrix and particle-size range under study.

The California framework functions as a technical reference point rather than a geographic rule. Organizations across the United States often choose to align to it because it currently offers the most demanding public reference for drinking-water microplastics. Alignment records should state that this choice is voluntary and explain why it was made.

## Reference Materials and How They Show Alignment

Standards define what a method must achieve, while reference materials show that a laboratory actually achieved it. Controlled-particle reference materials, meaning polymer particles of known size, shape, and composition, support two parts of an alignment exercise. They help validate methods by giving a traceable performance benchmark, and they show alignment by proving that identification and counting procedures match known values. Polymer Kit 1.0 illustrates the idea of a multi-polymer reference material used in this way. No specific vendor is endorsed. The key question is whether the reference material’s polymer types, size range, and certification documents match the method and matrix being validated. The [JRC 2024 review “Analytical methods to measure microplastics in drinking water” (JRC136859)](https://publications.jrc.ec.europa.eu/repository/bitstream/JRC136859/JRC136859_01.pdf) notes that harmonization and standardization remain incomplete, with only two partially relevant standards (ASTM D8332-20 and ISO 24187) in place and ISO 16094-1/-2/-3 not expected before mid-2025. Every alignment exercise must therefore work within this standards gap.

## Documenting a Justified Deviation

A deviation from a reference method can remain acceptable when it is handled correctly. Under [ISO/IEC 17025:2017](https://www.iso.org/standard/66912.html), [the international standard for testing and calibration laboratories](https://link.springer.com/article/10.1007/s00769-026-01732-7), [a laboratory may depart from a method only when the deviation is documented, technically justified, authorized, and accepted by the customer](https://studylib.net/doc/28549944/iso-iec-17025-2017-e---1-). The following protocol records a departure so it can withstand audit, peer review, or regulatory scrutiny.

1. Identify the exact clause or requirement being departed from, including the standard designation, year, and clause number.
2. State the deviation precisely, describing what the standard requires and what the laboratory did instead.
3. Provide the technical justification, explaining why the departure was necessary, such as matrix incompatibility, instrument limits, or the absence of a validated method for the target size range.
4. Describe the compensating control, such as strengthened blanks, a parallel method comparison, or expanded uncertainty reporting.
5. Record the approval authority, including the name, role, and date of the person who authorized the deviation within the laboratory’s quality system.
6. Set a review date for reassessing the deviation, especially when a new standard or validated method becomes available.

A four-level assessment scale, adapted from quality-system practice, gives a shared language for the alignment record.

- **Aligned** means the workflow stage meets the governing standard’s requirements without departure.
- **Partially Aligned** means the stage meets most requirements and includes one or more documented deviations with compensating controls.
- **Not Aligned** means the stage departs materially from the governing standard and no adequate compensating control exists.
- **Not Applicable** means the standard does not govern this stage for the matrix or method in use.

Consider a worked example. A laboratory uses Raman spectroscopy on a drinking-water sample under SWB-MP2-rev1 but selects a filter substrate that differs from the SOP’s specified membrane. The assessment is *Partially Aligned*. The deviation record lists the clause on filter specification, the departure, the technical reason, the compensating spike-recovery test with certified polymer particles, the approval signature, and the review date.

Deviations can be documented and controlled. Some gaps, however, arise from missing validated methods and cannot be closed by documentation alone. The next section covers the largest of these gaps.

[Create Defensible Deviation Records With WQI-CS-01 Templates](https://www.wellnessqualityinstitute.com/?utm_term=microplastics-reference-framework-alignment&utm_campaign=ai_growth_agent)

## The 1–20 µm Gap and the Nanoplastic Range as Alignment Limits

The [California State Water Board’s drinking-water definition covers solid polymer particles with at least three dimensions greater than 1 nanometer and less than 5,000 micrometers](https://filterdwaterguide.com/microplastics-in-drinking-water). [SWB-MP2-rev1](https://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/documents/microplastics/swb-mp2-rev1.pdf) (Raman spectroscopy) is [validated from 20 µm through 5,000 µm](https://filterdwaterguide.com/microplastics-in-drinking-water). [SWB-MP1-rev1](https://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/documents/microplastics/swb-mp1-rev1.pdf) (infrared spectroscopy) is [validated from 50 µm through 5,000 µm](https://filterdwaterguide.com/microplastics-in-drinking-water). [The 1–20 µm fraction remains unvalidated under both methods](https://filterdwaterguide.com/microplastics-in-drinking-water), and the nanoplastic range below 1 µm lies beyond reliable commercial measurement.

![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.**

These facts mean that no framework can be fully aligned across its own stated size range. The California definition reaches down to 1 nanometer, while the strongest validated methods begin at 20 or 50 micrometers, which are thousands of times larger. That distance creates an alignment limit, because the framework cannot be satisfied across its full scope with today’s validated tools. Any alignment record that omits this gap leaves a false impression of coverage. The correct entry for the 1–20 µm fraction is *Not Aligned*, because no validated method exists to align to.

## Cross-Matrix Alignment

A method validated for drinking water does not automatically carry over to food, tissue, or other complex materials. A documented method-equivalence review must support any transfer. The review needs to record five elements: the original validation matrix and conditions; the target matrix and its key characteristics, such as suspended solids, organic load, and particle background; the performance comparison, including bias, precision, recovery, and detection limits; any compensating controls; and the approval authority. A result produced under a drinking-water method on a food matrix without this review remains out of alignment for that matrix, regardless of the instrument or the standard cited.

## What Alignment Shows and What It Cannot Show

Citing a standard in a study protocol does not by itself prove compliance with that standard. Even a carefully aligned workflow only shows what was found above the method floor, within the tested polymer panel, during the sampled production period. That scope makes alignment documentation a quality-system record that supports evidence-based claims within defined limits rather than a blanket product guarantee. A dataset can be fully aligned, with every stage mapped and every deviation documented, and still cannot support a statement that a product contains no plastic. Detection confirms presence within the method’s reach and never proves absence beyond it.

## Where Independent Review Fits: WQI Plastic-Free Pathway Verification

The Wellness Quality Institute (WQI) offers Plastic-Free Pathway Verification, governed by WQI-CS-01, for organizations that have completed an alignment exercise and want an independent review of their existing laboratory dataset. The review covers testing methodology, product scope, and supporting controls against a defined standard. WQI-CS-01’s criteria align with the California State Water Board’s drinking-water microplastics reference framework.

![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.**

WQI provides review services rather than laboratory testing. A single assessment fee covers the review, the verification 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 laboratory. The verification period lasts 24 months from the sampling date of the most recent accepted dataset. Every Standard Met product receives a public registry listing, while Standard Not Met outcomes remain private.

*WQI Plastic-Free Pathway Verification does not certify that a product contains zero plastic, microplastics, or nanoplastics. It shows that the company follows 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.*

[Use WQI Plastic-Free Pathway Verification to Turn Aligned Data Into a Defensible Claim](https://www.wellnessqualityinstitute.com/?utm_term=microplastics-reference-framework-alignment&utm_campaign=ai_growth_agent)

## Reference List

- [ISO 24187:2023](https://www.iso.org/standard/78613.html) — Principles for the analysis of microplastics present in the environment
- [ISO 5667-27:2025](https://www.iso.org/standard/85557.html) — Water quality — Sampling — Part 27: Guidance on sampling for microplastics in water
- ISO 16094-2:2025 — Vibrational spectroscopy for microplastics in waters with low suspended solids
- [ISO/IEC 17025:2017](https://www.iso.org/standard/66912.html) — General requirements for the competence of testing and calibration laboratories
- [SWB-MP1-rev1](https://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/documents/microplastics/swb-mp1-rev1.pdf) — California SOP for microplastics in drinking water by infrared spectroscopy
- [SWB-MP2-rev1](https://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/documents/microplastics/swb-mp2-rev1.pdf) — California SOP for microplastics in drinking water by Raman spectroscopy
- JRC 2024 analytical methods review — European Commission Joint Research Centre review of analytical methods for microplastics

## Frequently Asked Questions

### What Is the Difference Between Framework Alignment, Compliance, and Validation in Microplastics Analysis?

Alignment is a written map that shows which standard governs each workflow stage, where the laboratory followed that standard, where it departed and why, and where no standard yet applies. Compliance is a regulatory decision made by an authority such as a regulator, an accreditation body, or a court, based on whether a specific legal or contractual requirement has been met. Validation is an analytical performance demonstration in which the laboratory shows, through bias and precision studies, spike recoveries, and interlaboratory comparison, that a method produces results fit for its intended use. A dataset can be aligned without being subject to any regulation and without using a fully validated method. Treating these three concepts as interchangeable remains one of the most common errors in microplastics quality documentation.

### Why Does the 1–20 µm Fraction Matter So Much for a Defensible Dataset?

As covered above, the California definition reaches down to 1 nanometer while the two validated methods stop at 20 µm and 50 µm. That gap leaves the 1–20 µm fraction inside the regulatory definition but outside both validated methods, which is why it must be named clearly in any alignment record. Any dataset that skips this point suggests coverage it does not have. Results in this range, when reported at all, carry higher uncertainty and cannot be treated as equivalent to results in the validated range. The nanoplastic range below 1 µm remains beyond reliable commercial measurement, so naming these limits openly is what makes the rest of the dataset defensible.

### When Does a Deviation From a Reference Method Become Disqualifying?

A deviation becomes disqualifying when it lacks documentation, technical justification, proper authorization, customer acceptance, or an adequate compensating control. Under ISO/IEC 17025:2017, [a laboratory may depart from a method when the departure is documented, technically justified, authorized within the quality system, and accepted by the customer](https://studylib.net/doc/28549944/iso-iec-17025-2017-e---1-). A change in filter substrate, for example, can be supported by spike-recovery comparisons on the substitute substrate, an expanded uncertainty estimate, and a clear note in the report. A decision to report results below a validated size range as if they were validated cannot be rescued by paperwork, because no reference exists for comparison. The four-level scale in this article, covering Aligned, Partially Aligned, Not Aligned, and Not Applicable, helps separate manageable deviations from structural gaps.

### Does Aligning to the California Framework Mean a Product Can Be Called Plastic-Free?

Alignment to the California State Water Board’s framework, or to any other reference framework, supports only scoped claims. The California definition covers a size range that no validated method can fully measure. A dataset aligned to SWB-MP1-rev1 or SWB-MP2-rev1 covers particles above 50 µm or 20 µm respectively. Everything below those floors, every polymer outside the tested panel, and every production lot not sampled lies outside the result. A non-detect finding means that no reportable particles were found above the method floor in the tested sample. The defensible position is that the dataset supports a statement about what was found within a defined scope, rather than a statement about what is absent across all sizes, polymers, and production periods.

### What Does Independent Review Add to an Already-Aligned Dataset?

An aligned dataset shows that the laboratory followed a documented process, recorded deviations, and named gaps. Independent review adds an outside judgment on whether that process supports the intended claim, whether the method suits the matrix, whether reporting limits meet a defined threshold, and whether the proposed claim language matches the evidence. Review by a body with no commercial interest in the outcome and no role in the testing converts internal documentation into an external finding. That distinction matters to retailers, procurement teams, regulators, and litigators, who all distinguish a company’s own records from an outside party’s assessment. The Wellness Quality Institute’s Plastic-Free Pathway Verification exists for organizations that have completed the alignment work and now need that independent review layer to use the dataset as the basis for a substantiated claim.

## Read Next

- [Microplastics Testing Methodology & Verification Standards](https://www.wellnessqualityinstitute.com/articles/microplastics-testing-methodology-standards/?utm_term=microplastics-reference-framework-alignment&utm_campaign=ai_growth_agent)
- [Microplastics Testing Standards: The Complete Guide](https://www.wellnessqualityinstitute.com/articles/microplastics-testing-standards/?utm_term=microplastics-reference-framework-alignment&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=microplastics-reference-framework-alignment&utm_campaign=ai_growth_agent)
- [Microplastics Methodology Validation: A Practical Guide](https://www.wellnessqualityinstitute.com/articles/microplastics-testing-methodology-validation/?utm_term=microplastics-reference-framework-alignment&utm_campaign=ai_growth_agent)
- [Microplastics Claims: Independent Dataset Review Explained](https://www.wellnessqualityinstitute.com/articles/water-quality-third-party-review/?utm_term=microplastics-reference-framework-alignment&utm_campaign=ai_growth_agent)

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- **Headline:** ISO 24187 Microplastics Framework Alignment Explained
- **Description:** Understand ISO 24187 microplastics alignment. The Wellness Quality Institute delivers independent verification for defensible, audit-ready results.
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  - **Name:** Scott Steveson
  - **JobTitle:** Specialist
  - **Description:** Scott Stevenson is part of the Wellness Quality Institute team, where he supports WQI’s work to advance product transparency, credible verification, and greater consumer trust. His background spans ethics and compliance, corporate trust, and responsible business, including experience with Ethisphere Institute and global companies navigating evolving standards and stakeholder expectations.
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## Citations

- [How To Verify Plastic Contamination In Protein Powder](https://www.wellnessqualityinstitute.com/articles/verify-protein-powder-plastic-contamination)
- [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)

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