# Microplastics Standards Compliance: Rules, Status & Evidence

> The Wellness Quality Institute breaks down California microplastics rules, legal status, and the evidence your brand needs. Get compliant today.

**Published:** 2026-11-09 | **Updated:** 2026-11-09 | **Author:** mihir
**URL:** https://www.wellnessqualityinstitute.com/articles/california-microplastics-compliance-rules
**Type:** post

**Categories:** Water Quality

![Microplastics Standards Compliance: Rules, Status & Evidence](https://wellnessquality.sites.aigrowthagent.co/wp-content/uploads/sites/93/2026/11/1794146913305-416c8bc7fd77-1024x572.webp)

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## Content

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

## Key Takeaways

- Three distinct California laws address plastics and microplastics, and each targets a different audience and purpose.
- SB 1422 requires selected public water systems to monitor and report microplastics in drinking water, and no maximum contaminant level exists.
- DTSC’s Candidate Chemicals listing for microplastics, effective October 1, 2026, creates no testing, labeling, or reporting obligations for manufacturers or retailers.
- SB 54 governs packaging waste and recycling targets, and it does not regulate microplastic content or testing in products.
- The Wellness Quality Institute offers independent review of laboratory data so brands can substantiate microplastics-related public claims.

[Talk to WQI](https://www.wellnessqualityinstitute.com/?utm_term=california-microplastics-compliance-rules&utm_campaign=ai_growth_agent)

## Microplastics Rules At A Glance For California

Three separate California regimes govern plastics and microplastics. Each has a different scope, status, and effective date.

1. **SB 1422 / State Water Board Drinking-Water Microplastics Monitoring**. This framework is final and in implementation. It requires selected public water systems to test and publicly report microplastics in drinking water using approved analytical methods. The State Water Board adopted it under [Resolution 2022-0032](https://waterboards.ca.gov/board_decisions/adopted_orders/resolutions/2022/rs2022-0032.pdf) on September 7, 2022. No maximum contaminant level, which is a legal concentration limit, has been set.
2. **DTSC Candidate Chemicals List Addition For Microplastics**. This regulation is final and becomes effective October 1, 2026. It adds microplastics to the Candidate Chemicals List under the Safer Consumer Products program. The listing allows future evaluation of products but creates no testing, labeling, or reporting obligation for manufacturers or retailers. Any Priority Product designation will require a separate future rulemaking.
3. **SB 54 Packaging Extended Producer Responsibility (EPR)**. This framework is in phased implementation. Final regulations took effect May 1, 2026. SB 54 governs single-use packaging waste and recycling, not microplastic content or testing. Key 2026 milestones include producer registration and the Circular Action Alliance program plan submission to CalRecycle on October 13, 2026.

## How To Tell Which Microplastics Regime Applies To You

Most compliance owners struggle to match their business to the correct microplastics regime. The following map clarifies who each rule covers.

**Water utilities and public drinking-water systems** are the primary audience for SB 1422. Under the State Water Board’s [Policy Handbook implementing Health and Safety Code section 116376](https://waterboards.ca.gov/board_decisions/adopted_orders/resolutions/2022/rs2022-0032.pdf), Phase I microplastics monitoring orders go primarily to large community water systems and wholesale water systems that serve more than 100,000 people. When a water system receives a monitoring order, it must test using an approved method at an accredited laboratory and report results publicly. SB 54 and the DTSC listing do not bind water utilities in their capacity as water providers.

**Consumer brands and packaging manufacturers** are the primary audience for SB 54 and, prospectively, for DTSC’s Safer Consumer Products framework. SB 54 governs packaging waste and recycling obligations, and it does not regulate microplastic content or testing. The DTSC Candidate Chemicals listing, effective October 1, 2026, allows DTSC to evaluate products that contain or generate microplastics and to consider future regulatory actions. The listing itself imposes no immediate compliance obligation. SB 1422 does not bind consumer brands in their capacity as product manufacturers.

**Laboratories** that run microplastics analysis on drinking water must follow the approved analytical methods, SWB-MP1-rev1 and SWB-MP2-rev1, and must hold California Environmental Laboratory Accreditation Program accreditation for the applicable method. Accreditation for one method does not confer accreditation for the other.

**Brands making a public plastic-related claim**, regardless of geography, face a separate issue. Their central question is what evidence supports the claim they intend to make. The evidence-readiness section below addresses that question.

## SB 1422 And The State Water Board Drinking-Water Framework

California Senate Bill 1422, [approved by the Governor and filed with the Secretary of State on September 28, 2018](https://leginfo.legislature.ca.gov/faces/billTextClient.xhtml), added Section 116376 to the California Health and Safety Code. It directed the State Water Resources Control Board to adopt a definition of microplastics in drinking water and a standard testing methodology. The State Water Board adopted the definition on June 16, 2020, under [Resolution 2020-0021](https://waterboards.ca.gov/drinking_water/certlic/drinkingwater/microplastics.html).

The regulatory definition describes microplastics in drinking water as solid polymeric material, meaning material made of polymers, the long-chain molecules that form plastics. The particles must have at least three dimensions greater than 1 nanometer and less than 5,000 micrometers. Polymers derived in nature that have not been chemically modified other than by hydrolysis are excluded. The definition is deliberately broad.

![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 State Water Board adopted [Resolution 2022-0032](https://waterboards.ca.gov/board_decisions/adopted_orders/resolutions/2022/rs2022-0032.pdf) on September 7, 2022. This resolution established a Policy Handbook that sets out a four-year, two-phase monitoring and reporting program. Phase I, from approximately Fall 2023 through Fall 2025, characterizes microplastics larger than 20 or 50 micrometers in drinking water sources. Phase II, from approximately Fall 2026 through Fall 2028, is designed to characterize microplastics as small as 5 micrometers in finished drinking water.

Two approved analytical methods govern how samples are analyzed under this framework.

- **SWB-MP1-rev1**. This method uses infrared spectroscopy, including FTIR, LDIR, and O-PTIR techniques. It is validated for particles greater than 50 micrometers through 5,000 micrometers. It was published May 27, 2022, and the full method is available at [waterboards.ca.gov](https://waterboards.ca.gov/drinking_water/certlic/drinkingwater/documents/microplastics/swb-mp1-rev1.pdf).
- **SWB-MP2-rev1**. This method uses Raman spectroscopy and is validated for particles greater than 20 micrometers through 5,000 micrometers. It was also published May 27, 2022, and the full method is available at [waterboards.ca.gov](https://waterboards.ca.gov/drinking_water/certlic/drinkingwater/documents/microplastics/swb-mp2-rev1.pdf).

A critical gap sits inside this framework. The definition reaches down to 1 nanometer, and the best validated methods begin at 20 or 50 micrometers, which are thousands of times larger. The 1 to 20 micrometer fraction is not validated under either approved method. Everything below 20 micrometers, including the entire nanoplastic range, is currently beyond reliable commercial measurement under these methods. The State Water Board determined there was insufficient evidence to issue a notification level or any numerical health-based guidance, so the framework creates no maximum contaminant level.

![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.**

## DTSC Candidate Chemicals Listing For Microplastics

The Department of Toxic Substances Control finalized a regulation adding microplastics to the Candidate Chemicals List under its Safer Consumer Products program, effective October 1, 2026. DTSC [announced the action on July 2, 2026](https://dtsc.ca.gov/2026/07/02/california-finalizes-regulation-adding-microplastics-to-candidate-chemicals-list).

The listing allows DTSC to evaluate consumer products that contain or generate microplastics and to consider future regulatory actions where warranted. It functions as an early-warning and evaluation tool.

The listing itself imposes no obligation on manufacturers or retailers. The Candidate Chemicals listing is separate from a Priority Product designation. It creates no testing requirement, labeling requirement, or reporting requirement. It does not function as a ban or a maximum contaminant level. Any Priority Product rulemaking that could eventually create compliance obligations will follow a separate process that requires its own rulemaking. As of the October 1, 2026 effective date, DTSC has not initiated such a process for microplastics.

## SB 54 Packaging EPR And Its Relationship To Microplastics

SB 54, the Plastic Pollution Prevention and Packaging Producer Responsibility Act, establishes an extended producer responsibility program for single-use packaging and plastic food service ware. Final implementing regulations took effect May 1, 2026. Producers had until June 1, 2026, to join the Circular Action Alliance, register with CalRecycle as an independent producer, or apply for the small-producer exemption.

SB 54’s compliance targets phase in progressively. The law requires a 10% reduction in single-use plastic packaging by January 1, 2027, and a 30% recycling rate by January 1, 2028. It then requires a 20% reduction and 40% recycling rate by January 1, 2030. By January 1, 2032, it requires a 25% source reduction, a 65% recycling rate, and 100% of single-use packaging sold to be fully recyclable or compostable. CAA submitted its revised program plan to CalRecycle on October 13, 2026, and CalRecycle has 75 days to respond.

SB 54 governs packaging waste and recycling obligations. It does not regulate microplastic content in products, does not require microplastic testing, and does not set any microplastic concentration standard. A brand reviewing its SB 54 obligations is answering a different question than a brand reviewing its microplastics claim substantiation.

## Current Legal Status Of Microplastics Limits

No maximum contaminant level exists for microplastics in drinking water. Neither California nor the U.S. EPA has established a maximum contaminant level for microplastics in drinking water. [40 CFR Part 141 Subpart G](https://ecfr.gov/current/title-40/chapter-I/subchapter-D/part-141/subpart-G), the federal National Primary Drinking Water Regulations, sets maximum contaminant levels for several contaminant groups. Microplastics appear in none of these tables.

In April 2026, the U.S. EPA included microplastics as a priority contaminant group on its draft Sixth Contaminant Candidate List, known as CCL 6. A CCL listing functions as a research watchlist. It identifies contaminants for potential future consideration but does not establish any monitoring requirement, treatment obligation, or concentration limit.

A standard analytical method and a concentration limit are two distinct regulatory instruments. A method, such as SWB-MP1-rev1 or SWB-MP2-rev1, specifies how samples are collected, processed, and analyzed so results can be generated consistently and compared across laboratories. A method does not establish that any measured result complies with or violates a legal threshold, because no such threshold exists. Regulators can standardize data collection before they set a health-based limit, and the state has taken that approach here.

For brands, the absence of a maximum contaminant level makes claim substantiation the central issue rather than regulatory compliance. There is no legal line to stay below. The key question is what the data actually shows and whether a public claim can be defended.

## Evidence A Brand Should Assemble For Claims

Brands that intend to make a public plastic-related claim need a defensible evidence base. The following documentation categories reflect what an independent review of a microplastics dataset would examine.

- **Laboratory qualification and accreditation**. The laboratory should be accredited for the applicable method and matrix. California ELAP accreditation for the applicable SWB method is the strongest credential. ISO/IEC 17025 accreditation with the method and matrix explicitly in scope also meets rigorous review expectations.
- **Analytical method and matrix suitability**. The method should fit the product being tested. A method validated for treated drinking water may not apply directly to a beverage or product with a different composition, known as the matrix.
- **Tested particle-size range**. The evidence should state what size range the method covered. A result of “no microplastics detected” is limited by the instrument’s detection floor. A method starting at 50 micrometers cannot see anything smaller.
- **Polymer panel**. The report should list which polymer types were screened. A minimum defensible panel includes polyethylene, polypropylene, polyethylene terephthalate, polystyrene, polyvinyl chloride, polyamide, polycarbonate, and polymethyl methacrylate.
- **Reporting limits, blanks, and contamination controls**. The dataset should include laboratory reagent blanks and field blanks. Spike recoveries should fall within acceptable ranges. Blank data forms the foundation for any non-detect result.
- **Chain of custody and data recency**. The records should show an unbroken chain from sample collection through analysis. The data should be recent enough to reflect current production.
- **Product scope**. The dataset should specify which products, SKUs, and production periods it covers. A single product result cannot be extended to an entire product line or company.

The Wellness Quality Institute, introduced here by its full name, offers an independent review pathway that addresses this evidence gap. The Wellness Quality Institute’s Plastic-Free Pathway Verification, governed by the standard WQI-CS-01, independently reviews a company’s existing third-party laboratory dataset, analytical method, product scope, and supporting controls. The review uses defined criteria aligned with the State Water Board’s drinking-water microplastics reference framework. The Wellness Quality Institute does not perform laboratory testing. It reviews the data a company already holds or data the company commissions from a qualified independent laboratory.

![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.**

A single assessment fee covers the review, verification decision, and registry listing. There is no separate mark-license or registry fee. Independent laboratory testing is arranged and billed separately. A Standard Not Met outcome is private and resubmittable. The outcome is never described as a failed product and may reflect insufficient data or an unsupported method rather than any issue with the product itself. A Standard Met outcome carries a scope-locked mark license, a public registry listing, and approved claim language tied to the specific reviewed evidence.

Verification by the Wellness Quality Institute is optional and not endorsed by the state. It offers an independent review pathway for US companies that want to turn existing laboratory data into a defensible, scope-locked 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 state approval, government certification, or health or safety certification.

[Talk to WQI](https://www.wellnessqualityinstitute.com/?utm_term=california-microplastics-compliance-rules&utm_campaign=ai_growth_agent)

## Status And Dates Timeline For Microplastics Rules

- **September 28, 2018**. SB 1422 approved by the Governor and filed with the Secretary of State, adding Health and Safety Code section 116376. *Final.*
- **June 16, 2020**. State Water Board adopts the drinking-water microplastics definition under Resolution 2020-0021. *Final.*
- **May 27, 2022**. State Water Board publishes final versions of SWB-MP1-rev1, the infrared method, and SWB-MP2-rev1, the Raman method. *Final.*
- **September 7, 2022**. State Water Board adopts Resolution 2022-0032 and the Microplastics in Drinking Water Policy Handbook, establishing the four-year monitoring program. *Final.*
- **Fall 2023 – Fall 2025**. Phase I monitoring covers source water at large systems serving more than 100,000 people. *In implementation.*
- **2022 (enacted) / May 1, 2026 (final regulations effective)**. SB 54 Plastic Pollution Prevention and Packaging Producer Responsibility Act. *In phased implementation.*
- **June 1, 2026**. SB 54 producer registration deadline, which required producers to join CAA, register independently, or apply for the small-producer exemption. *Passed.*
- **July 2, 2026**. DTSC announces finalization of the microplastics Candidate Chemicals List regulation. *Final.*
- **October 1, 2026**. DTSC microplastics Candidate Chemicals listing becomes effective and creates no testing, labeling, or reporting obligation. *Effective.*
- **October 13, 2026**. CAA submits revised SB 54 program plan to CalRecycle. CalRecycle has 75 days to respond, with a deadline of approximately December 27, 2026. *Under review.*
- **Fall 2026 – Fall 2028**. Phase II monitoring covers finished drinking water and targets particles as small as 5 micrometers. *Forthcoming.*
- **January 1, 2027**. SB 54 first source-reduction target requires a 10% reduction in single-use plastic packaging. *Forthcoming.*
- **January 1, 2032**. SB 54 final targets require a 25% source reduction, 65% recycling rate, and 100% recyclable or compostable packaging. *Forthcoming.*

## Conclusion And Practical Next Steps For Brands

The three plastics regimes serve different purposes and bind different readers. SB 1422 and the State Water Board framework govern drinking-water monitoring by public water systems and do not govern product claims by consumer brands. The DTSC Candidate Chemicals listing, effective October 1, 2026, allows future evaluation of consumer products and creates no immediate obligation. SB 54 governs packaging waste and recycling and does not regulate microplastic content or testing.

Across all three regimes, one fact holds. No maximum contaminant level exists for microplastics at the state or federal level. A standard analytical method is not a concentration limit. For brands, claim substantiation is the operative question rather than regulatory compliance. The relevant issues include what the existing laboratory data shows, which size range it covers, which polymers it includes, which products it represents, and whether an independent body can review and defend that finding.

Primary regulatory sources for this topic include [waterboards.ca.gov](https://waterboards.ca.gov/drinking_water/certlic/drinkingwater/microplastics.html) for the SB 1422 framework and [dtsc.ca.gov](https://dtsc.ca.gov/2026/07/02/california-finalizes-regulation-adding-microplastics-to-candidate-chemicals-list) for the Candidate Chemicals listing. For companies that intend to make a public claim, independent review of the underlying dataset converts a laboratory report into a defensible market position.

[Talk to WQI](https://www.wellnessqualityinstitute.com/?utm_term=california-microplastics-compliance-rules&utm_campaign=ai_growth_agent)

## Frequently Asked Questions

### Definition Of Microplastics In Drinking Water

The definition of microplastics in drinking water describes solid polymeric material, meaning material composed of the long-chain molecules that form plastics. The particles must have at least three dimensions greater than 1 nanometer and less than 5,000 micrometers. Polymers derived in nature that have not been chemically modified other than by hydrolysis are excluded. The State Water Resources Control Board adopted this definition on June 16, 2020, under Resolution 2020-0021. The definition is deliberately broad and extends beyond what current analytical methods can reliably measure, which is why the validated detection ranges of the approved methods, starting at 20 or 50 micrometers, are much narrower than the definition itself.

### State Microplastics Limits In Drinking Water

The State Water Board framework establishes monitoring and reporting requirements and approved analytical methods, and it does not set a maximum contaminant level for microplastics. A maximum contaminant level is an enforceable legal concentration limit. The State Water Board determined there was insufficient evidence to issue a notification level or any numerical health-based guidance. The U.S. EPA has also set no federal maximum contaminant level for microplastics. A standard analytical method specifies how samples are analyzed and does not establish that any measured result complies with or violates a legal threshold.

### Scope And Coverage Of SB 1422

SB 1422 is a law signed in 2018 that directed the State Water Resources Control Board to adopt a definition of microplastics in drinking water, develop standard testing methods, and require four years of monitoring and public reporting. It applies to public water systems, including utilities and community water systems, that receive monitoring orders from the State Water Board. These orders primarily go to large systems that serve more than 100,000 people. SB 1422 does not create a general testing obligation for consumer brands, product manufacturers, or arbitrary water samples. Resolution 2022-0032 and the associated Policy Handbook govern the monitoring and reporting program.

### DTSC Changes On October 1, 2026 And Testing Requirements

On October 1, 2026, the Department of Toxic Substances Control added microplastics to its Candidate Chemicals List under the Safer Consumer Products program. This listing allows DTSC to evaluate consumer products that contain or generate microplastics and to consider future regulatory actions. The listing does not impose any testing, labeling, or reporting obligation on manufacturers or retailers. It does not function as a ban or a maximum contaminant level. Any Priority Product designation, which is the step that could eventually create compliance obligations, will require a separate future rulemaking process that has not been initiated as of the October 1, 2026 effective date.

### Scope Of SB 54 And Microplastics Coverage

SB 54, the Plastic Pollution Prevention and Packaging Producer Responsibility Act, is the extended producer responsibility law for single-use packaging and plastic food service ware. It requires covered producers to achieve a 25% reduction in single-use plastic packaging, a 65% recycling rate, and 100% recyclable or compostable packaging by 2032, with phased targets beginning in 2027. SB 54 governs packaging waste and recycling obligations. It does not regulate microplastic content in products, does not require microplastic testing, and does not set any microplastic concentration standard. A brand’s SB 54 obligations and its microplastics claim substantiation sit in separate frameworks.

### Rules For Consumer Brands Versus Water Utilities

A public water utility that receives a State Water Board monitoring order is subject to SB 1422 testing and reporting requirements and must use approved methods at ELAP-accredited laboratories. SB 54 and the DTSC Candidate Chemicals listing do not bind water utilities in their capacity as water providers. A consumer brand is the primary audience for SB 54 packaging extended producer responsibility obligations and, prospectively, for DTSC’s Safer Consumer Products framework. As of October 1, 2026, the DTSC listing imposes no immediate compliance obligation on brands. SB 1422 does not bind consumer brands as product manufacturers. A brand making a public plastic-related claim faces a claim-substantiation question that sits outside all three regulatory regimes.

### Meaning Of A “No Microplastics Detected” Lab Report

A lab report that states “no microplastics detected” does not, on its own, prove that a product is on a verified pathway. A non-detect result means no particles were found above that instrument’s detection floor, for the polymer types it screened, in the lot it tested. A method that begins at 50 micrometers cannot see anything smaller, so a non-detect result can coexist with particles present below that size. The reporting limits themselves must meet defined requirements, or the non-detect result carries little weight. Independent review of the method, the laboratory’s qualifications, the blank controls, and the product scope converts a laboratory report into a finding that can be defended publicly.

### Steps To Substantiate A Microplastics-Related Claim

Substantiation requires more than a laboratory report. A defensible claim rests on a qualified laboratory, an appropriate analytical method for the product matrix, a documented tested particle-size range, a defined polymer panel, adequate reporting limits, blank and contamination controls, chain of custody, data recency, and a clearly scoped product definition. Independent third-party review of that full dataset, by a body with no commercial interest in the outcome, separates a claim a company asserts from a claim a company can substantiate. The Wellness Quality Institute’s Plastic-Free Pathway Verification reviews existing third-party laboratory data against defined criteria aligned with the State Water Board’s drinking-water microplastics reference framework. The process produces either a Standard Met outcome with approved claim language and a public registry listing or a private Standard Not Met outcome that companies can resubmit with updated information.

## What to Read Next

- [California Microplastics Regulations: What Brands Must Know](https://www.wellnessqualityinstitute.com/articles/california-microplastics-framework/)
- [California Microplastics Water Rules: What Brands Must Know](https://www.wellnessqualityinstitute.com/articles/california-microplastics-standard-compliance/)
- [Microplastics Beverage Standards: What Applies in 2026](https://www.wellnessqualityinstitute.com/articles/california-microplastics-standard-beverages/)
- [Microplastics Packaging Standards: What Actually Binds You](https://www.wellnessqualityinstitute.com/articles/california-microplastics-packaging-standards/)
- [How to Read & Verify Microplastics Lab Reports in 2026](https://www.wellnessqualityinstitute.com/articles/california-microplastics-compliance-2026/)

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## Citations

- [Microplastics in Bottled Water: 2024 PNAS Study Findings](https://www.wellnessqualityinstitute.com/articles/microplastics-bottled-water-study)
- [Microplastics vs. Nanoplastics: What You Need To Know](https://www.wellnessqualityinstitute.com/articles/nanoplastics-vs-microplastics)
- [Microplastics in Bottled Water: Which Part Is Responsible](https://www.wellnessqualityinstitute.com/articles/microplastics-sources-bottled-water)
- [Microplastics in Bottled Water Brands: What Studies Show](https://www.wellnessqualityinstitute.com/articles/microplastics-levels-bottled-water-brands)
- [What “None Detected” Means in Microplastics Testing](https://www.wellnessqualityinstitute.com/articles/none-detected-microplastics-testing-meaning)

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