Can drinking water treatment plants remove microplastics effectively?
Not fully. Treatment plants remove some microplastics, but many particles survive treatment and reach your tap.
What's actually in it
Drinking water treatment plants use coagulation, flocculation, sedimentation, filtration, and disinfection to clean raw water before it reaches your tap. These processes were designed to remove bacteria, viruses, and chemical contaminants. Microplastics are a newer challenge, and most plants weren't built with plastic particles in mind.
The particles range in size from visible fibers to nanoscale fragments. Larger particles are easier to catch, but smaller ones slip through conventional treatment.
What the research says
A 2025 study in NPJ Clean Water tested microplastic removal across 10 drinking water treatment facilities and their distribution systems. The plants removed a portion of microplastics, but particles still made it through treatment and into the distribution system.
Removal rates varied widely between facilities, depending on their treatment technology. Advanced filtration steps caught more particles than basic treatment. But even the best-performing plants didn't achieve complete removal. The distribution pipes then added more particles on the way to the tap.
The takeaway: your water treatment plant helps but doesn't fully protect you. A home point-of-use filter with a pore size of 1 micron or smaller catches what the treatment plant misses. Reverse osmosis systems are even more effective for nanoplastic removal.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Microplastic removal across ten drinking water treatment facilities and distribution systems. | NPJ Clean Water | 2025 |
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