There’s a Surprisingly Simple Way to Remove Microplastics in Your Drinking Water

You probably drank some plastic today. Not on purpose, and not in pieces you could see. Microplastics and nanoplastics have now been found in human placentas, bones, and brain tissue, and a big share of them gets in through what we eat and drink.

Tap water is one of those routes. Water treatment plants catch a lot of these particles, but not all of them.

So here’s some genuinely good news. A team of scientists in China found that boiling your tap water, then pouring it through a simple filter, can remove up to 90 percent of the tiny plastic particles in it. No special gadget. Just the kettle or pot already sitting in your kitchen.

What the Researchers Found

The study, led by biomedical engineer Zimin Yu and colleagues at Guangzhou Medical University, was published in Environmental Science & Technology Letters. The team tested both soft tap water and hard tap water, which carries more dissolved minerals. They added nanoplastics and microplastics (researchers call them NMPs) to the samples, boiled the water, and then filtered out whatever settled.

The results were striking:

• In hard water, boiling and filtering removed up to 90 percent of the plastic particles.
• The harder the water, the better it worked. Removal climbed from 34 percent at 80 mg of calcium carbonate per liter to 84 percent at 180 mg/L and 90 percent at 300 mg/L.
• Even in soft water, roughly a quarter of the particles were caught.

The team also tested water loaded with extra nanoplastics, and boiling still cut the numbers down. Their conclusion was direct: drinking boiled water looks like a workable long-term way to lower how much plastic we take in.

Why Hard Water Works Better

The secret is limescale. You know that chalky white crust that builds up inside a kettle? That’s calcium carbonate.

When hard water heats up, calcium carbonate comes out of solution and forms crystals. Those crystals grow right on the surface of the plastic particles and lock them inside a crust. Once the plastic is trapped, it’s heavy enough to settle and big enough to catch with a filter.

Soft water has less calcium carbonate to work with, so fewer particles get trapped. That’s why the numbers drop to around 25 percent. Still, a quarter less plastic is better than none.

Why This Matters for Your Health

We don’t yet know exactly how much harm microplastics do inside the human body. That research is still catching up. But what we do know is enough to take them seriously.

Plastic fragments don’t break down. They just get smaller. Earlier studies have found bits of polystyrene, polyethylene, polypropylene, and PET in ordinary tap water. Once inside us, these particles have been linked to changes in the gut microbiome and to antibiotic resistance. As a gastroenterologist, the gut piece gets my attention. Your gut bacteria help run your digestion, your immune system, and even your mood. Anything that disrupts them deserves a hard look.

A 2025 review from the University of Texas at Arlington added another reason to care: a meaningful share of our microplastic exposure may come from drinking water, because treatment plants still don’t remove all of it.

Now, a few honest caveats. This was a lab study, and the researchers added plastic particles to the water themselves. Real-world tap water may behave differently. The team says larger studies with many more samples are the next step. And boiling won’t touch the plastic you get from food, packaging, or the air. Think of this as one solid habit, not a complete fix.

How to Do It at Home

This takes almost no effort. Here’s the routine:

1. Fill a stainless steel or glass kettle or pot with tap water.
2. Bring it to a full, rolling boil and let it boil for a few minutes.
3. Let it cool. This gives the trapped particles time to settle.
4. Pour the water through a fine stainless steel mesh strainer, the kind you’d use for loose-leaf tea. The researchers specifically suggested this type of filter.
5. Store the filtered water in a glass or stainless steel container in the fridge.

One more thing. Don’t do any of this in a plastic kettle. Heating water in plastic can shed its own particles, which defeats the whole point.

My Personal RX on Getting the Plastic Out of Your Glass

I love research like this because it hands you something you can do tonight. No prescription, no expensive equipment, no waiting for the science to be perfect. You boil, you strain, you drink.

But water is only one way plastic gets into your body. Your gut sits on the front line of all of it, so protecting your gut health matters just as much as cleaning up what’s in your cup. Here’s what I recommend to my patients:

1. Make boiled, strained water your default. Boil a batch each evening, let it cool overnight, strain it in the morning, and keep it in the fridge. If you have hard water, you’ll get the biggest payoff.
2. Descale your kettle often. That limescale is where the trapped plastic ends up. Clean it out every week or two with white vinegar and a good rinse so it doesn’t build up.
3. Retire your plastic kettle. Switch to stainless steel or glass. Heating water in plastic is one habit worth breaking right away.
4. Cut back on bottled water. Studies have found bottled water carries far more plastic particles than once thought. Filtered tap water in a glass or steel bottle is the better choice.
5. Never microwave food in plastic. Even containers labeled microwave-safe can release huge numbers of particles when heated. Transfer food to glass or ceramic first.
6. Support your gut bacteria daily. A healthy microbiome is your body’s best line of defense. I formulated MindBiotic to support the gut-brain connection with probiotics in an easy daily chew.
7. Eat more fiber. Vegetables, beans, lentils, oats, and berries feed your good gut bacteria and keep digestion moving. Aim for a variety of plants every week.
8. Give your gut a full reset. If your digestion has felt off, my Gut Brain Reset Bundle combines the products I use most for restoring gut balance.
9. Swap your food storage. Replace plastic containers with glass or stainless steel, and never pour hot food into plastic.
10. Build a whole-body plan. Small swaps add up when they’re part of a bigger strategy. My Protocol for Optimizing Your Health & Wellbeing walks you through the daily habits I recommend for long-term health.

Sources:

1. Yu Z, et al. Drinking Boiled Tap Water Reduces Human Intake of Nanoplastics and Microplastics. Environmental Science & Technology Letters, 2024.
2. Nield D. There’s a Surprisingly Simple Way to Remove Microplastics in Your Drinking Water. ScienceAlert, October 16, 2026.