Which Water Filter Actually Removes PFAS and Microplastics?

Clean-looking tap water can still carry things you'd rather not drink. A 2024 study found bottled water averages about 240,000 plastic particles per liter, and the U.S. Geological Survey estimates at least 45% of U.S. tap water contains PFAS, the forever chemicals. So the real question isn't whether to filter, it's which filter actually does the job you need.

The one thing the marketing blurs

Contaminants split into two groups that are removed in completely different ways. Particles like sediment and microplastic fragments are caught by fine physical filtration, which is what a micron rating describes. Dissolved chemicals like PFAS, lead, and chlorine aren't stopped by pore size at all. They're reduced by activated carbon, ion exchange, or reverse osmosis.

So a low micron rating tells you nothing about whether a filter removes PFAS or lead. That's a separate question, answered by the filter's media and its certification, not its pore size.

Check the right certification

This one catches people. 

NSF/ANSI 53, and the older P473, is the standard for PFOA and PFOS. NSF/ANSI 401 is not the PFAS standard, despite how often it gets cited that way. And "tested to" a standard is not the same as "certified to" it. Both can be credible, but they aren't equivalent, so read the claim closely.

Which type fits you

1. Pitchers and carafes

The cheapest way in, need no installation, and suit renters or a single concern like chlorine or lead. 

2. Under-sink carbon and media filters 

Give better flow at moderate cost and handle chlorine, taste, and many contaminants depending on the media. 

3. Reverse osmosis 

The most thorough option for dissolved contaminants including PFAS and lead, in countertop or under-sink form. 

4. Whole-house systems 

Treat every tap for chlorine, sediment, and scale, though most do not reduce PFAS. And a small number of whole-house systems are built specifically for PFAS, using media tested to reduce it at every tap.

Start with what's actually in your water (your utility's annual report and the EWG Tap Water Database help), then match the format to your situation. 

Weigh lifetime cost too, not just the sticker, because a cheap unit with frequent filter changes can cost more over a few years than a pricier one with long-life cartridges.