Explainer: Microplastics regulation & mitigation — what it is, why it matters, and how to evaluate options

Researchers have detected microplastics in human blood, placental tissue, lung biopsies, and every major ocean basin on Earth, with an estimated 11 million metric tonnes of plastic entering the oceans annually, according to the OECD's 2025 Global Plastics Outlook. Concentrations in freshwater systems have increased 2.5 times over the past decade, and airborne microplastic deposition has been measured at altitudes above 3,000 meters in the Alps and Pyrenees. For sustainability professionals and product teams, microplastics regulation is accelerating from voluntary guidelines toward binding limits on emissions, concentrations, and intentionally added particles: the European Union's restriction on intentionally added microplastics under REACH took effect in October 2023, with full phase-out timelines running through 2035 for specific product categories.

Why It Matters

Microplastics are synthetic polymer particles smaller than 5 millimeters in diameter, originating from the fragmentation of larger plastic items, the shedding of synthetic textile fibers during washing, tire wear on road surfaces, and the intentional addition of plastic particles to products such as cosmetics, paints, detergents, and agricultural fertilizer coatings. The scale of the problem is vast: the Pew Charitable Trusts and SYSTEMIQ estimated in their 2024 update to the "Breaking the Plastic Wave" report that without intervention, plastic pollution in aquatic environments will triple by 2040 compared to 2016 levels.

The health implications are driving regulatory urgency. A landmark 2024 study published in the New England Journal of Medicine found that patients with microplastics detected in carotid artery plaque had a 4.5 times higher risk of heart attack, stroke, or death over a 34-month follow-up period compared to patients without detectable microplastics. The World Health Organization's 2025 assessment of microplastics in drinking water concluded that while current exposure levels pose limited acute risk, chronic low-dose exposure pathways remain insufficiently studied, and the precautionary principle warrants regulatory action.

From a business standpoint, companies across textiles, packaging, personal care, automotive, and agriculture face direct regulatory exposure. The EU REACH restriction on intentionally added microplastics affects an estimated 42,000 products, with compliance costs projected at EUR 12 billion to EUR 19 billion across affected industries over the 20-year implementation period (European Chemicals Agency, 2024). California's SB 54 and the proposed federal Break Free from Plastics Act in the United States signal that US regulatory action, while lagging the EU, is accelerating. Companies that delay mitigation investments face both compliance costs and reputational risk as consumer awareness grows: 73% of consumers surveyed by Mintel in 2025 expressed concern about microplastics in food packaging and personal care products.

Key Concepts

Primary vs. secondary microplastics: Primary microplastics are intentionally manufactured at small sizes for use in products: microbeads in cosmetics, plastic pellets (nurdles) used as raw material in manufacturing, and granular infill in artificial turf. Secondary microplastics result from the degradation and fragmentation of larger plastic items through UV exposure, mechanical abrasion, and weathering. Secondary sources dominate total emissions by volume, with tire wear particles, textile fiber shedding, and paint degradation collectively accounting for over 80% of microplastic releases to the environment in OECD countries (OECD, 2025).

Microfiber shedding: Synthetic textiles release plastic microfibers during production, wearing, and laundering. A single domestic wash cycle releases 700,000 to 6 million microfibers depending on fabric type, garment age, wash temperature, and detergent chemistry. Polyester fleece garments shed the most: up to 1.7 grams of microfibers per wash. Microfiber shedding from textiles is estimated to contribute 35% of total primary microplastic releases to the marine environment globally (International Union for Conservation of Nature, 2024).

Tire wear particles (TWP): The abrasion of tire treads on road surfaces generates an estimated 6 million tonnes of tire wear particles globally per year. These particles, composed of synthetic rubber polymers, carbon black, and chemical additives, wash into stormwater systems and eventually reach waterways. TWP represent the single largest source of microplastic pollution in many urban catchments, accounting for 28% of total microplastic loads in European rivers (Fraunhofer Institute, 2024).

Intentionally added microplastics: Synthetic polymer particles deliberately included in product formulations for functional purposes: abrasive microbeads in exfoliating scrubs, encapsulation agents in slow-release fertilizers, film-forming agents in paints, and sequestering agents in detergents. The EU REACH restriction targets this category specifically, requiring reformulation or phase-out across affected product types with transitional periods of 4 to 12 years depending on application.

Wastewater treatment capture rates: Conventional wastewater treatment plants (WWTPs) capture 80 to 95% of microplastics in influent through settling and filtration stages. However, even 95% removal still translates to billions of particles released per day from large treatment facilities. Advanced tertiary treatment technologies such as membrane bioreactors, rapid sand filtration with coagulation, and dissolved air flotation can achieve 99%+ removal rates but add 15 to 30% to operating costs (Water Research Foundation, 2025).

What's Working

EU REACH restriction driving reformulation at scale. The EU's restriction on intentionally added microplastics, adopted in September 2023, is the most comprehensive regulatory intervention to date. It covers microbeads in cosmetics and detergents (immediate ban), granular infill for synthetic turf (8-year transition), agricultural capsule coatings (5-year transition), and industrial abrasives. Major personal care companies including L'Oreal, Unilever, and Beiersdorf had already reformulated 90%+ of affected products by early 2025, replacing plastic microbeads with alternatives such as silica, cellulose, and ground walnut shell. The restriction is projected to reduce intentionally added microplastic releases in the EU by 500,000 tonnes over 20 years (ECHA, 2024).

Washing machine filter mandates gaining traction. France became the first country to mandate microfiber filters on all new domestic and commercial washing machines, effective January 2025. The law requires filters capable of capturing at least 50% of synthetic microfibers with particle sizes above 50 micrometers. Samsung, LG, and Bosch have released compliant models with built-in filtration, with independent testing by the French National Institute for Industrial Environment and Risks (INERIS) showing capture rates of 54 to 78% across certified devices. South Korea announced similar requirements effective 2027, and California's AB 1628 mandates microfiber filters on new washing machines sold in the state beginning January 2029.

Advanced stormwater treatment for tire wear particles. Several municipalities have deployed targeted infrastructure to capture tire wear particles before they reach waterways. Stockholm's LIFE STOP Microplastics project installed 14 bioretention systems and enhanced stormwater filters along major roadways, capturing an estimated 60 to 80% of TWP from treated runoff. The systems use a combination of geotextile membranes, biochar filtration media, and settling chambers at a capital cost of EUR 15,000 to EUR 40,000 per installation. In the US, the Washington State Department of Ecology's 2024 study demonstrated that biochar-enhanced rain gardens remove 92% of tire-derived contaminant 6PPD-quinone, a chemical shown to be acutely toxic to coho salmon, from highway stormwater.

What's Not Working

Secondary microplastic sources remain largely unregulated. While the EU REACH restriction targets intentionally added microplastics, secondary sources such as tire wear, textile fiber shedding, and paint weathering generate far larger volumes and are not covered by any binding regulatory framework. Tire wear particles alone contribute an estimated 1.3 million tonnes of microplastics to the European environment annually, dwarfing the 42,000 tonnes per year from intentionally added sources. The regulatory gap exists because secondary sources are diffuse, difficult to measure at point of release, and involve established industries with significant lobbying capacity.

Microfiber filter effectiveness is limited without behavior change. Washing machine filters capture a portion of microfibers but do not address shedding during garment production (which occurs at industrial laundry facilities), wearing (friction-based shedding), or drying (lint traps in dryers capture some fibers but release others as airborne particles). Moreover, filter adoption rates depend on consumer maintenance: filters must be cleaned regularly, and captured material must be disposed of properly rather than rinsed down the drain. Early evidence from France suggests that consumer compliance with filter maintenance is approximately 40 to 50%, significantly reducing real-world capture rates below laboratory performance.

Global plastics treaty negotiations remain inconclusive. The UN Intergovernmental Negotiating Committee (INC) has held five sessions since 2022 to develop a legally binding global treaty on plastic pollution, including microplastics. As of early 2026, negotiations remain stalled on key provisions: upstream production caps (opposed by petrochemical-producing nations), binding microplastic emission limits, and financing mechanisms for developing countries. Without a global framework, regulation remains fragmented, with stringent rules in the EU, moderate action in East Asia, and minimal requirements in most of the Global South, Africa, and Latin America.

Monitoring and measurement standards are inconsistent. There is no globally harmonized methodology for sampling, identifying, and quantifying microplastics in water, soil, air, or biological tissues. Different research groups use different size thresholds (1 micrometer vs. 5 millimeters), identification methods (FTIR spectroscopy vs. Raman spectroscopy vs. visual identification), and reporting units (particles per liter vs. mass per kilogram). This inconsistency makes it difficult to compare data across studies, set science-based regulatory limits, or verify compliance with emission reduction targets.

Key Players

Established Companies

• BASF: reformulated agricultural coating products to replace microplastic-based capsule technologies with biodegradable polymer alternatives ahead of REACH deadlines
• Unilever: completed elimination of plastic microbeads across all personal care brands by 2023 and invested in microfiber reduction through fabric treatment technologies
• Samsung: developed built-in washing machine microfiber filters meeting France's 2025 mandate, with Less Microfiber technology capturing up to 54% of synthetic fibers
• Veolia: deployed advanced tertiary wastewater treatment systems achieving 99%+ microplastic removal at municipal treatment plants in France and the UK

Startups

• PlanetCare: Slovenian company producing retrofit and built-in washing machine microfiber filters with 90%+ capture rates, deployed across 30+ countries with partnerships with brands including Patagonia and Samsung
• Matter: developed compostable microplastic alternatives for use in cosmetics, detergents, and agricultural coatings using cellulose and protein-based particles
• Wasser 3.0: German startup using silicone-based agglomeration technology to remove microplastics from wastewater at costs 50 to 70% lower than membrane filtration
• Xeros Technology Group: developed XFiltra filtration technology for commercial laundry applications, capturing 78% of microfibers from industrial wash loads

Investors and Funders

• European Investment Bank: provided EUR 30 million in financing for microplastic removal infrastructure projects across EU member states through the Circular Economy Initiative
• Minderoo Foundation: funded the Plastics and Human Health research program and the Sea the Future microplastics monitoring initiative, with AUD 300 million committed to plastic pollution reduction
• Ellen MacArthur Foundation: coordinates the New Plastics Economy Global Commitment, with 500+ signatories representing 20% of all plastic packaging produced globally

Key Metrics

Metric	Current State	Target (2030)	Unit
Intentionally added microplastic releases (EU)	~42,000 tonnes/yr	<10,000 tonnes/yr	tonnes per year
Washing machine filter adoption	<5% of installed base	25-35%	% of machines with filters
Wastewater treatment microplastic removal	80-95%	95-99%	% removal rate
Tire wear particle capture (urban stormwater)	<5%	20-30%	% of TWP captured
Microfiber shedding per wash cycle (best practice)	200,000-700,000 fibers	<100,000 fibers	fibers per cycle
Countries with binding microplastic regulations	8-10	25-30	countries

Action Checklist

• Audit product portfolios for intentionally added microplastics, including cosmetics, cleaning products, paints, coatings, and agricultural inputs, and map compliance obligations under EU REACH and national regulations
• Evaluate reformulation options for affected products, prioritizing biodegradable polymer alternatives, cellulose-based particles, or mineral abrasives with documented performance equivalence
• Assess textile supply chain exposure to microfiber shedding regulations by testing key fabric types for fiber release rates using standardized methods (ISO 4484-1:2023)
• Engage with washing machine filter manufacturers to evaluate integration opportunities for appliance brands or partnership models for textile companies
• Review wastewater discharge permits and treatment capabilities at manufacturing facilities to determine microplastic removal performance and upgrade requirements
• Track legislative developments across priority markets including the EU, France, California, South Korea, and the UN plastics treaty negotiations
• Establish internal microplastic measurement protocols using harmonized methods (FTIR or Raman spectroscopy) to baseline emissions and track reduction progress
• Set quantitative microplastic reduction targets with milestone dates aligned to regulatory timelines and publish progress in sustainability disclosures

FAQ

Q: What is the difference between microplastics and nanoplastics, and why does it matter for regulation? A: Microplastics are defined as synthetic polymer particles between 1 micrometer and 5 millimeters in diameter. Nanoplastics are smaller than 1 micrometer and can penetrate biological membranes, crossing the blood-brain barrier and entering cells directly. Current regulations, including the EU REACH restriction, focus on microplastics because detection and measurement methods for nanoplastics are still developing. However, nanoplastics are increasingly recognized as the greater health concern due to their bioavailability. The EU's REACH restriction defines its scope using a 1 nanometer lower bound and 5 millimeter upper bound, effectively covering both micro and some nanoscale particles when intentionally manufactured. Companies should anticipate that future regulatory updates will tighten size thresholds as nanoplastic detection methods mature.

Q: How should companies prioritize microplastic mitigation investments across different source categories? A: Prioritization should follow three criteria: regulatory exposure (which sources face binding limits soonest), magnitude of emissions (which sources contribute the most volume from your operations), and cost-effectiveness of available interventions. For most consumer goods companies, intentionally added microplastics in product formulations are the highest priority because EU REACH restrictions carry binding deadlines and non-compliance penalties. Textile companies should prioritize microfiber shedding reduction through fabric engineering and finishing treatments, as washing machine filter mandates are expanding. For tire and automotive companies, tire wear particle reduction through compound reformulation and road surface optimization represents the largest emission source but faces the least regulatory pressure currently, making it a medium-term priority.

Q: What are the most credible certifications and standards for microplastic-free product claims? A: The most rigorous standard is the Zero Plastic Inside certification administered by the Beat the Microbead coalition, which verifies that personal care products contain no synthetic polymer microparticles. For textiles, the OEKO-TEX STeP certification includes microfiber shedding assessment, and the Microfibre Consortium's test method (TMC Microfibre Release Test) provides standardized shedding data comparable across products. For packaging, the OK Biodegradable WATER certification from TUV Austria verifies that materials biodegrade in aquatic environments. Be cautious of vague claims like "ocean-friendly" or "microplastic-conscious" without third-party verification. The ISO Technical Committee 61 (Plastics) is developing ISO 24187 for harmonized microplastic measurement in environmental matrices, expected to be finalized in 2026, which will provide a common basis for regulatory compliance claims.

Q: How effective are current wastewater treatment plants at removing microplastics, and what upgrades are needed? A: Conventional activated sludge wastewater treatment plants with secondary treatment remove 80 to 95% of microplastics by mass, primarily through settling and skimming processes. However, the remaining 5 to 20% still represents billions of particles per day for large municipal plants serving populations above 500,000. Tertiary treatment technologies such as membrane bioreactors achieve 99%+ removal but add 15 to 30% to operating costs. Rapid sand filtration with prior coagulation using polyaluminium chloride achieves 97 to 99% removal at lower cost increments of 5 to 10%. For industrial facilities, dissolved air flotation combined with chemical flocculation is effective for removing microfibers from textile manufacturing wastewater. The European Commission's revised Urban Waste Water Treatment Directive, adopted in 2024, requires EU member states to upgrade large treatment plants to achieve microplastic removal performance standards by 2035.

Sources

• OECD. (2025). Global Plastics Outlook: Policy Scenarios to 2060. Paris: Organisation for Economic Co-operation and Development.
• European Chemicals Agency. (2024). Restriction on Intentionally Added Microplastics: Impact Assessment Update. Helsinki: ECHA.
• Marfella, R., et al. (2024). "Microplastics and Nanoplastics in Atheromas and Cardiovascular Events." New England Journal of Medicine, 390(10), 900-910.
• Fraunhofer Institute for Environmental, Safety, and Energy Technology. (2024). Microplastic Emissions from Tire Wear: Quantification and Mitigation Pathways. Oberhausen: Fraunhofer UMSICHT.
• International Union for Conservation of Nature. (2024). Primary Microplastics in the Oceans: A Global Evaluation of Sources, Updated Assessment. Gland: IUCN.
• Water Research Foundation. (2025). Advanced Treatment Technologies for Microplastic Removal in Municipal Wastewater. Denver: WRF.
• Mintel. (2025). Consumer Attitudes Toward Plastic Pollution and Microplastics in Personal Care Products. London: Mintel Group.