One claim, and it is widely held
Microplastics is unusual on this site: the certification question has a short, reassuring answer.
There is exactly one claim — microplastics reduction under NSF/ANSI 401 — and NSF’s listing on 2026-09-10 held:
| Microplastics, NSF/ANSI 401 | |
|---|---|
| Rows NSF returned | 1,099 |
| Distinct model designations | 806 |
| Companies | 48 |
For comparison, the lead claim under NSF/ANSI 53 is held by 615 distinct models and the total PFAS claim by 49.
→ Which claims exist at all, and how populated each is
The format spread is the finding
Most claims on this site collapse into one product category. Fluoride and hexavalent chromium exist only on under-sink reverse osmosis. Chloramine holds no pitcher at all.
Microplastics does not behave that way:
| Category | Models |
|---|---|
| Plumbed-in | 416 |
| Commercial modular | 129 |
| Plumbed-in to separate tap | 88 |
| Pour-through (pitcher) | 64 |
| Refrigerator filter, integrated | 48 |
| Faucet mount | 32 |
| Counter-top connected to sink faucet | 18 |
| Pour-through gravity system | 7 |
| Point-of-entry (whole-house) | 0 |
Seventy-one pitchers and gravity systems hold this claim. So a household that cannot fit an under-sink unit is not locked out of it, which is the opposite of the fluoride situation.
→ Filters certified for fluoride, and why they are all one format
No whole-house product holds it. That matches a wider census across twelve claims, which found no point-of-entry product holding any health-related claim except VOC reduction.
→ What a whole-house filter is certified to do
What there is no number for
Microplastics does not appear anywhere in EPA’s National Primary Drinking Water Regulations. The full table was fetched and searched on 2026-09-10: the term occurs zero times, while entries such as total chromium and trihalomethanes are present, which confirms the table itself came back.
That has a specific consequence and it cuts both ways. Your utility has no figure to report, so your annual report will not mention microplastics — and the absence is not evidence of anything, in either direction.
→ How to read your water quality report
It also means the certified claim is the only benchmark a household has. On most contaminants this site can set a claim against a regulatory limit. Here there is no limit to set it against.
This page takes no position on health effects, because nothing in the register supports one.
A discrepancy in NSF’s own materials
Worth stating plainly rather than smoothing over.
NSF’s listing search offers sixteen selectable claims under NSF/ANSI 401, microplastics among them. NSF’s narrative page for the standard describes up to 15 individual contaminants.
Both are NSF. The standard’s full title is “Drinking Water Treatment Units - Emerging Compounds/Incidental Contaminants”, and microplastics sits a little oddly against that description — but which of the two figures NSF intends as current is not something this page can establish, and it does not guess.
The listing is the operative document for a buyer either way, because it records what each model actually holds.
→ How to read an NSF listing, footnotes included
The decision framework
1. Decide whether this is a reason to buy on its own
There is no regulatory limit, no reported figure, and no way to test your own water for it at household cost.
If microplastics is your only concern, you are buying against a claim with no benchmark. That is a legitimate choice, and it is worth making knowingly.
If you were buying a filter anyway, this claim is cheap to add, because so many models already hold it.
2. Pick the format that suits your home
This is the criterion that usually gets decided for you and here does not. Pitchers, faucet mounts, fridge filters, counter-top and under-sink systems all have certified options.
3. Check the claim on the model, not the category
806 models hold it, which means far more do not. Claims vary by product, and some NSF entries carry the footnote “conforms to the material requirements only” — a listing under a standard with no reduction claim at all.
4. Do not substitute a micron rating for the claim
A micron rating is certified as particulate reduction under NSF/ANSI 42 or 53. Microplastics reduction is a separate claim under NSF/ANSI 401. A filter may hold one, both or neither, and the listing is where that is recorded.
→ Micron ratings, absolute and nominal
Applying the framework: who holds the claim
| Company | Models |
|---|---|
| Everpure LLC | 221 |
| Solventum Purification Inc. | 99 |
| Kaz USA (Helen of Troy) | 87 |
| Microfilter Co., Ltd. | 67 |
| Hydronovation Inc. | 60 |
| Omnipure Filter Co. | 30 |
| Paragon Water Systems | 29 |
| Whirlpool Corporation | 23 |
| Access Business Group (Amway) | 22 |
| Doulton Water Filters | 19 |
| Pentair Residential Filtration | 17 |
| Water Channel Partners | 15 |
The remaining 36 companies hold fewer than 15 models each.
Notes tied back to the criteria
- Everpure’s 221 are a large share of the total, and much of that company’s listing sits in commercial modular, so the household-relevant population is smaller than 806.
- Kaz USA appears here with 87 models and held all 29 lead-certified faucet mounts in the separate lead roster, so the faucet-mount route to this claim is concentrated.
- Doulton and Paragon are point-of-use specialists, which is consistent with the format spread rather than an exception to it.
- Nothing in the listing distinguishes these models on performance, because NSF records claim membership rather than a reduction percentage.
The decision path
| Your situation | What decides it | Where that lands you |
|---|---|---|
| Buying a filter anyway | The claim is widely held | Add it to your model check |
| Microplastics is the only concern | No limit, no reported figure | A judgement, made knowingly |
| Want a pitcher | 64 pour-through models hold it | Certified options exist |
| Want a fridge filter | 48 integrated models hold it | Check your exact cartridge |
| Want whole-house coverage | No certified example | Point-of-use instead |
| Comparing on micron rating | Different claim entirely | Look for the 401 claim by name |
| Already own a certified filter | Claims are per model | Look the model up again |
Choose a pour-through or faucet mount if
- You want the claim without plumbing work. Sixty-four pitchers, seven gravity systems and 32 faucet mounts hold it.
Choose an under-sink system if
- You want this claim alongside others that only under-sink formats carry, such as fluoride or hexavalent chromium.
→ Chromium-6, and the narrowest of the NSF/ANSI 58 claims
Choose to do nothing if
- You have no other reason to filter and are uncomfortable buying against a claim with no regulatory benchmark. That is a coherent position and this page will not argue you out of it.
Mistakes that cost the most money
Reading a micron rating as a microplastics claim. They are separate certifications under separate standards.
Assuming your existing filter covers it. 806 models hold the claim out of many thousands listed. Look yours up.
Buying whole-house for it. No point-of-entry product held the claim in this listing.
Treating the absence of an EPA limit as reassurance, or as alarm. There is no standard, so there is nothing to be compliant or non-compliant with.
Paying a premium for the claim alone. It is widely held, including on inexpensive formats, so it rarely needs to drive the purchase.
Forgetting cartridge replacement. EPA states carbon filters have a specified shelf life and should be replaced on schedule. A claim describes a cartridge inside its rated life.
Three situations, and what changes
You are replacing a pitcher anyway. Sixty-four pour-through models hold the claim, so it costs nothing but a model check to pick one that does.
You already run an under-sink system for lead or fluoride. Look the model up again rather than adding anything. Plumbed-in and separate-tap formats account for 504 of the 806 certified models, so yours may already hold it.
Someone has quoted you a whole-house system for microplastics. No point-of-entry product holds the claim here. Ask which accredited body certified theirs and for which claim.
The objections worth answering
“There is no standard, so the claim is meaningless.” The claim is a tested protocol under NSF/ANSI 401, which is a real thing to hold. What is missing is a regulatory limit to compare your water against — a different gap, and the page says so rather than conflating them.
“806 models sounds like everything is certified.” It is a small fraction of NSF’s listed population. The chlorine claim alone is held by 3,479 distinct models.
“My filter says it removes 99.9 percent of microplastics.” That names a figure and no standard. NSF’s listing names the claim per model and records no percentage, so the marketing number is not something the listing supports.
“These figures will move.” They will. NSF dates its listings and asks readers to confirm status at source, which is why the capture date sits beside every figure here.
Who this is for
Anyone choosing a filter who wants microplastics covered, and anyone trying to work out whether the claim on a box means anything.
It takes no position on health effects and names no recommended product.
What to settle first
Does my model list microplastics reduction under NSF/ANSI 401?
One claim, one lookup. And because 806 models across nearly every format hold it, the answer is more often yes than on anything else covered here.
→ Which claims exist at all, and how populated each is → How to read an NSF listing, footnotes included → Micron ratings, which are a different claim entirely → Cyst reduction, where the format spread runs the other way → The one claim pitchers are properly represented in → Unregulated contaminants, and the two mechanisms that watch them → The other fifteen NSF/ANSI 401 claims, seven of them medicines