Boiling Tap Water May Help Remove Microplastics, Study Finds

Microplastics are turning up in nearly every glass of tap water, but a new study suggests that one of the simplest kitchen routines—boiling water—could help cut them out. According to Earth.com, chemists Zhanjun Li and Eddy Zeng found that boiling hard water can remove up to 90% of microplastics.

The research, published in Environmental Science and Technology Letters, reveals that minerals like calcium carbonate naturally found in hard water crystallize when heated. These flakes bind to microplastic fragments like polystyrene and polyethylene, dragging them to the bottom of the kettle. Once cooled, the plastic-laden scale can be scrubbed away—or left behind in the kettle.

Even in soft water, which contains fewer minerals, the process removed about 25% of microplastics. But in harder water areas, such as parts of Texas or Indiana, removal rates were far higher. For best results, the researchers recommend boiling for five minutes and pouring slowly to avoid reintroducing settled particles. A basic paper coffee filter can trap any that remain suspended.

This method doesn’t replace industrial filtration, but it offers a nearly free, low-tech way to reduce plastic exposure right at home. It also aligns with World Health Organization and U.S. Geological Survey guidance encouraging practical steps to limit ingestion of plastic particles while more robust solutions are developed.

If your kettle crusts up often, you’re likely in a hard water zone—good news in this case. Try boiling your tap water before use and cleaning your kettle regularly. And if you live in a soft water area, a pinch of food-grade lime can help the process work better—just stay within safe limits set by the EPA.

Boiling water won’t solve the plastic crisis, but it’s a meaningful start. Making small daily changes like this supports a cleaner, safer, and more sustainable world. Every step counts—especially when it’s already part of your routine.

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