Is there really plastic in the tap water no matter how the city treats it?
Yes. Microplastic shows up in drinking water at every step from aquifer to tap.
What's actually in it
Microplastic enters water at the source (rain, runoff, plastic litter), survives most treatment plants because the particles are too small for normal filters, and picks up more plastic from HDPE pipes, fittings, and storage tanks on its way to the tap.
Even tap water from cleaner regions usually carries some plastic, just less.
What the research says
A 2026 study in J Xenobiot traced plastic particles through the entire drinking water chain in Milan, Italy: from the aquifer to the kitchen tap. Plastic showed up at every step. The treatment plant cut some, but not all, and the pipes added more on the way to homes.
The team flagged storage tanks and old plumbing as the biggest in-home sources.
Use a high-quality countertop or under-sink filter. Look for one rated to NSF/ANSI 401 or one that lists microplastic removal. Reverse osmosis cuts the most. Avoid bottled water as a workaround, since it can carry as much or more plastic.
The research at a glance
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