How to Remove Microplastics From Drinking Water: 5 Easy Fixes

What are microplastics, and how do they get into tap water?

Microplastics are plastic particles from 1 micrometer to 5 millimeters across. A micrometer (µm) is one thousandth of a millimeter. Pieces smaller than 1 µm are called nanoplastics.

They come from the slow breakdown of bigger plastic. Think clothing fibers, worn packaging, tire dust and plastic film. Rain and wastewater carry them into the rivers and lakes that feed city water systems.

How much reaches the plant? A 2025 study of ten Canadian treatment plants found 1,193 to 7,185 particles per liter in raw source water. Most were tiny. About 81% were smaller than 20 µm.

The good news: those plants removed more than 97.5% before the water left. The catch is that most U.S. utilities don't test for microplastics at all. So you rarely know what reaches your tap.

Why is everyone talking about microplastics in water right now?

Two stories landed on the same day. On October 1, 2026, California's rule adding microplastics to its Candidate Chemicals List took effect. The state's Department of Toxic Substances Control runs that list.

Being on the list doesn't ban anything yet. It lets the state study products that release microplastics and require safer options later. California already made water systems test for microplastics under Senate Bill 1422. The State Water Board adopted that testing policy in 2022.

The same day, the Delaware River watershed study hit the news. Fibers showed up in every waterway sampled. Fragments showed up in 82%, and film in 77%.

Put those together and you get the question people are typing into Google this week. If my city doesn't filter for it, what can I do at home?

How to remove microplastics from drinking water: which methods work?

Here are the five fixes, from free to fully installed. Each one is backed by a study or a test standard you can check.

1. Can you boil it out?

Yes, partly, and only well in hard water. Hard water is water rich in calcium and magnesium. When you boil it, calcium carbonate forms. That's the white scale in your kettle. The scale grows around plastic bits and traps them.

2. Do certified pitcher and faucet filters work?

The certified ones do. NSF/ANSI 401 includes a microplastics reduction claim. To earn it, a filter must cut test particles between 0.5 and 1 µm by at least 85%. That test comes from NSF/ANSI 42, Class I.

Many filters skip this test. If the box only says "reduces sediment," you don't know how it handles microplastics. Look up the exact model on the certifier's website before you buy.

3. Is ultrafiltration the sweet spot?

Ultrafiltration (UF) pushes water through a membrane with extremely small pores. Unlike reverse osmosis, it keeps dissolved minerals such as calcium and magnesium in the water.

Home UF cartridges use the same membrane principle at a smaller scale. That's why a UF stage is worth looking for in an under-sink system.

4. What about reverse osmosis?

Reverse osmosis (RO) forces water through the tightest membrane sold for home use. It reaches the smallest particles of any method here. The trade-offs: it strips out most minerals, and part of the water goes down the drain. Our water ionizer vs reverse osmosis guide covers that choice in detail.

5. Should you change how you store and carry water?

Yes. Filtering means little if you then pour the water into a single-use plastic bottle. Use glass or stainless steel. Don't heat food or drinks in plastic containers.

Which home method removes the most microplastics?

Short version: membranes beat everything else, and certified filters beat uncertified ones. Here is how the five options compare on evidence, cost and effort.

So, what is the bottom line on how to remove microplastics from drinking water? Use a UF or RO membrane, or an NSF/ANSI 401 certified filter, every day. Boiling is a good free backup when your water is hard.

Is bottled water safer than filtered tap water?

Not when it comes to plastic particles. In 2024, Columbia University researchers used a new laser imaging method on bottled water. They found about 240,000 plastic particles per liter on average. Roughly 90% were nanoplastics, too small for older tests to count.

Experts quoted in the Delaware River coverage gave the same advice. More microplastics are found in plastic bottles than in tap water, so filtered tap water is the better bet.

Can a water ionizer help remove microplastics?

Here's the honest answer. The filter stage does the removing. The electrolysis stage adds what people buy an ionizer for. A water ionizer is a two-stage system. First it filters tap water. Then a small electric process splits it into alkaline and acidic streams.

Our Alpha 1700 and under-sink Alpha U1700 use two replaceable cartridges. The ALPHA UF membrane and ALPHA EM CARBON cartridges sit in front of the electrolysis cell. That cell is our Optimized 7 SMART Plate design.

That UF stage belongs to the same membrane class that topped the 2025 plant study. After filtering, the cell makes alkaline reduced water with dissolved hydrogen. Its ORP is typically in the −400 to −800 mV range. The U1700 faucet offers alkaline, purified and acidic settings, so you can choose plain filtered water too.

Want the full breakdown of each stage? Read does a water ionizer purify water. To see how alkaline and hydrogen water differ, see our hydrogen water vs alkaline water guide. Whatever you buy, ask for filter specs and the replacement schedule, and keep to it.

Are microplastics in drinking water harmful to your health?

Nobody can say for sure yet. In 2019, the World Health Organization reviewed the evidence on microplastics in drinking water. It flagged major knowledge gaps and called for more research.

Since then, studies have found microplastics in human blood and organs. A researcher quoted by Stanford Report called them "Trojan horses" that may carry chemicals like BPA. But cause and effect remains unclear.

So reducing exposure is a sensible, low-regret step. It is not a treatment for anything. If you have a health condition, talk to your physician before changing your routine.

What is a simple 6-step plan to cut microplastics at home?

If you only remember one thing about how to remove microplastics from drinking water, make it this checklist.

• 1. Find out what is in your water: Read your utility's annual water quality report or test a private well. Note whether your water is hard or soft.
• 2. Choose a certified filter: Pick a filter certified to NSF/ANSI 401 for microplastics, or a system with an ultrafiltration or reverse osmosis membrane.
• 3. Keep cartridges fresh: Replace cartridges on the maker's schedule. A clogged or old cartridge filters less well.
• 4. Boil and strain as a backup: If your water is hard, boil it five minutes, cool it, and pour it through a fine filter.
• 5. Skip single-use plastic bottles: Carry filtered tap water in a glass or stainless steel bottle.
• 6. Don't heat food or water in plastic: Use glass, ceramic or steel for hot drinks and cooking water.

Curious how water minerals fit in? Our guide to magnesium in drinking water explains why keeping minerals matters when you filter.

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