Does your tap water contain microplastics from the supply chain?

What's actually in it

Drinking water travels a long path before it reaches your glass. It starts in an underground aquifer or surface reservoir, gets pumped to a treatment plant, flows through miles of pipes, and finally comes out of your faucet. At every step along the way, plastic pipes, fittings, storage tanks, and seals can shed particles into the water.

Water treatment plants are designed to remove bacteria and chemical contaminants, but most aren't equipped to filter out micro- and nanoplastics. The particles are too small and too numerous for standard filtration to catch them all.

What the research says

A 2026 study in J Xenobiot tracked plastic particles through an entire urban drinking water supply chain in Milan, Italy, from the underground aquifer to the tap. They found microplastics at every single stage.

The source water already contained particles, and the numbers increased as water moved through the distribution network. Plastic pipes used to carry the water added their own contamination. By the time it reached the tap, the water contained a mixture of plastic types including polyethylene, polypropylene, and PVC fragments.

The study showed that even cities with modern water treatment can't fully stop microplastics from reaching your home. A point-of-use filter on your faucet or pitcher is the last line of defense. Filters rated to catch particles down to 1 micron or smaller are most effective at reducing microplastic exposure.