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FilterScored

Contaminant · Water

Microplastics

No federal EPA MCL yet; reduction is certified under NSF/ANSI 53. 6 of the water filters we score hold an accredited NSF, WQA, or IAPMO certification to reduce Microplastics, and 5 more market it with no accredited certification we could verify. A claim is not a certification.

What it is

Microplastics are exactly what they sound like - tiny plastic particles, generally measured down to about 0.5 microns (a micron is a thousandth of a millimeter, far too small to see). They reach tap water from things like the breakdown of larger plastic debris, synthetic fibers, and packaging, and they can hang on as water moves through pipes and treatment systems. Worth knowing for what comes next: they are counted as physical particles, not as a dissolved chemical.

Why it matters

This is a newer concern, and the rules are still catching up. There is no federal maximum contaminant level for microplastics yet, and California became the first state to require monitoring for them. NSF/ANSI 53 has since added a microplastics reduction claim, which tests the reduction of plastic particles roughly 0.5 microns and larger. What we score is whether a filter is certified to reduce this contaminant, not any health outcome.

What removes it

The certified path is a filter listed to NSF/ANSI 53 for microplastics, or reverse osmosis under NSF/ANSI 58. The trap to watch for: an ordinary carbon pitcher does not necessarily capture particles this small, so a generic "filters your water" claim tells you almost nothing here. What you actually want is certification for microplastics specifically, listed on a public NSF, WQA, or IAPMO database.

Reference: EPA (no federal MCL for microplastics; California monitoring requirement); NSF/ANSI 53 microplastics reduction claim; NSF/ANSI 58 (reverse osmosis).

Scored filters certified for Microplastics

Marketed for Microplastics, but not certified

These scored filters market Microplastics reduction but we found no accredited NSF, WQA, or IAPMO certification for it - "tested to" is not "certified to." Absence of certification is not proof a product fails to reduce it, only that we found no independent verification.

FAQ

Does a Brita or carbon pitcher remove microplastics?
Only if that specific model is certified for it. A carbon pitcher is not automatically rated for particles this small, so the certification listing is the thing to trust, not the type. In our catalog the Brita Elite Pitcher is listed on the public WQA certification database under a master certification to NSF/ANSI 53 and 401 that includes microplastics, while a plain carbon pitcher with no such listing does not earn that credit in our scoring.
Does boiling water remove microplastics?
Boiling is not a certified method for reducing microplastics, and we found no accredited certification that treats it as one - so it is not the answer here. To target microplastics specifically, the certified approaches are a filter listed to NSF/ANSI 53 for microplastics or reverse osmosis under NSF/ANSI 58.

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