⚡ TL;DR – Key Takeaways
The U.S. Environmental Protection Agency made a big move on April 2, 2026. It published the Draft Sixth Contaminant Candidate List (CCL 6) in the Federal Register. This is the first time the agency officially called microplastics a contaminant group that needs serious research and possibly future rules under the .
This decision shows a huge change in how the government sees those tiny plastic bits. You can find them in almost every water source now, from mountain springs to city taps. Add this to the new PFAS limits that also start in 2026, and it’s clear American drinking water is entering a whole new era of regulation.
Here’s what you should know about EPA CCL 6, why microplastics are a big deal, and which water treatment systems actually get rid of them.
This announcement opened a 60-day public comment period, which closes on June 2, 2026. The EPA expects to finalize CCL 6 by November 17, 2026, after talking with its independent Science Advisory Board (SAB).
It’s important to note that the U.S. Department of Health and Human Services (HHS) also announced a $144 million investment in a new microplastics research program. This money will help measure plastics in human tissue, check out health impacts, and explore ways to remove them. This coordinated federal effort means microplastics regulation, while still years away, is now moving faster.
“EPA is taking bold action to ensure drinking water is safe from microplastics, pharmaceuticals, and potential hidden contaminants.”
U.S. Environmental Protection Agency, April 2, 2026
- Plastic breaking down: Bottles, packaging, and synthetic clothes break into tiny micro- and nano-sized pieces over time from sun exposure and wear and tear.
- Wastewater discharge: Regular city wastewater treatment removes about 70-80% of microplastics, but the rest goes into our surface water.
- Stormwater runoff: Rain washing over roads carries tire rubber bits, synthetic fibers from clothes, and broken single-use plastics into waterways.
- Farm sources: Plastic mulch film, irrigation pipes, and applying biosolids put plastics directly into soil and groundwater.
| Health Concern | Mechanism | Status of Evidence |
|---|---|---|
| Inflammation | Physical irritation from particles in tissues | Strong in animal studies; human studies are ongoing |
| Endocrine disruption | Plasticizers (phthalates, BPA) leaking from plastic particles | Well-documented for specific compounds |
| Oxidative stress | Free radicals created by nano-plastic fragments | Lab evidence; limited human data |
| Gut microbiome disruption | Building up in intestinal tissue | Emerging – studies from 2024-2025 |
| Cardiovascular risk | A 2024 NEJM study linked plaque microplastics to heart attack/stroke risk | Significant – human group data |
A major 2024 study in the New England Journal of Medicine found microplastics and nanoplastics in arterial plaque samples. It linked their presence to a 4.5-times higher risk of heart attack, stroke, or death over a three-year period. This was the first big human clinical evidence connecting microplastics to heart and blood vessel problems.
The global market for PFAS treatment is expected to hit $2.1 billion in 2026 and grow to $3.4 billion by 2033 as rules get stricter worldwide. We expect microplastics regulation to follow a similar path: starting with candidate listing, then monitoring requirements, and finally, MCLs.
For water treatment plant operators and building owners, the lesson from PFAS is clear: start looking at your microplastic removal options now. Don’t wait until binding regulations force you to rush compliance.
Reverse osmosis systems and ultrafiltration membranes can effectively remove microplastics from drinking water. The key is how small the membrane pores are compared to the particle size.
AMPAC USA builds commercial and industrial reverse osmosis systems for everything from small point-of-use needs to large city-wide treatment. Our systems process water at commercial capacity and meet or beat NSF/ANSI 58 standards for reducing contaminants.
Standard coagulation-flocculation-sedimentation – the backbone of most municipal water treatment – removes approximately 70-80% of microplastics by mass but is ineffective against smaller particles and nanoplastics. Activated carbon alone does not physically retain microplastics, though it can adsorb some plastic-associated chemical pollutants.
commercial reverse osmosis systems and engineered for today’s most challenging water quality requirements – including PFAS, microplastics, nitrates, heavy metals, and dissolved solids.
Our membrane systems are designed to exceed current and anticipated regulatory standards, protecting municipalities, manufacturers, schools, hospitals, and commercial facilities from emerging contaminants before they become mandates.
Whether you need a <250 GPD commercial RO unit for a restaurant or a multi-million-gallon industrial system for a manufacturing facility, AMPAC USA engineers a solution matched to your flow rate, source water chemistry, and regulatory requirements.
Contact AMPAC USA today at (909) 762-8020 or visit our website to speak with a water treatment engineer about your microplastic removal and PFAS compliance needs.
📚 References & Further Reading
Likely yes, in small amounts. Studies have found microplastics in treated tap water across the United States and globally, though concentrations vary widely by source, treatment method, and pipe infrastructure age. The EPA CCL 6 listing means federal data collection on tap water levels will intensify in 2026-2027.
No. Boiling water does not remove microplastics – it can actually increase their concentration as water volume reduces through evaporation. Physical filtration (reverse osmosis, nanofiltration, or ultrafiltration) is required to remove particles.
There is no set timeline. EPA must first finalize CCL 6 (expected November 2026), then conduct regulatory determinations (typically 2-3 years), develop analytical methods, and complete cost-benefit analysis before proposing an MCL. Realistically, a proposed MCL for microplastics is unlikely before 2030-2032. However, state-level standards may emerge earlier.
PFAS already have enforceable MCLs (set in 2024, compliance by April 2027). Microplastics on CCL 6 are at an earlier stage – candidate listing, not yet regulated. Think of CCL 6 as the starting gun, while PFAS is already in the final sprint toward compliance.
Our membrane systems are designed to exceed current and anticipated regulatory standards, protecting municipalities, manufacturers, schools, hospitals, and commercial facilities from emerging contaminants before they become mandates.
Whether you need a <250 GPD commercial RO unit for a restaurant or a multi-million-gallon industrial system for a manufacturing facility, AMPAC USA engineers a solution matched to your flow rate, source water chemistry, and regulatory requirements.
Contact AMPAC USA today at (909) 762-8020 or visit our website to speak with a water treatment engineer about your microplastic removal and PFAS compliance needs.
📚 References & Further Reading
Likely yes, in small amounts. Studies have found microplastics in treated tap water across the United States and globally, though concentrations vary widely by source, treatment method, and pipe infrastructure age. The EPA CCL 6 listing means federal data collection on tap water levels will intensify in 2026-2027.
No. Boiling water does not remove microplastics – it can actually increase their concentration as water volume reduces through evaporation. Physical filtration (reverse osmosis, nanofiltration, or ultrafiltration) is required to remove particles.
There is no set timeline. EPA must first finalize CCL 6 (expected November 2026), then conduct regulatory determinations (typically 2-3 years), develop analytical methods, and complete cost-benefit analysis before proposing an MCL. Realistically, a proposed MCL for microplastics is unlikely before 2030-2032. However, state-level standards may emerge earlier.
PFAS already have enforceable MCLs (set in 2024, compliance by April 2027). Microplastics on CCL 6 are at an earlier stage – candidate listing, not yet regulated. Think of CCL 6 as the starting gun, while PFAS is already in the final sprint toward compliance.
