Is a charcoal filter enough to remove microplastics from tap water?
For most microplastics, yes. For nanoplastics, only reverse osmosis reliably removes them.
What's actually in it
Activated carbon (charcoal) filters catch particles down to about 1 micrometer and remove many chemical contaminants. They work well for most microplastics, which are typically larger than 20 micrometers. They don't reliably catch nanoplastics (below 1 micrometer), which slip through.
Reverse osmosis membranes have pore sizes around 0.0001 micrometers, small enough to block nearly all plastic particles.
What the research says
A 2025 study in NPJ Clean Water tracked microplastics from source water to the consumer tap. Treatment removed most larger microplastics, but smaller particles passed through. Home under-sink carbon filters catch most of the remainder; reverse osmosis catches nearly all.
For daily drinking water, a quality carbon filter is a solid upgrade over bottled water (which has more microplastics than most tap). If nanoplastics matter to you, add a reverse osmosis stage. Store filtered water in glass or stainless steel to avoid reintroducing plastic.
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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