Which Water Filter Brands Have NSF/ANSI 372 Certification?

NSF/ANSI 372 certification doesn't mean a filter removes lead from water. It's a materials-safety standard confirming that the wetted parts of a certified product, such as housings, fittings, and valves, meet the federal "lead free" limit for lead content, not a test of how well the filter reduces lead already in your tap water. Viomi, Waterdrop, APEC, AquaTru, Culligan, Clearly Filtered, and BOROUX are all described by their own official product pages and certification documentation as holding NSF/ANSI/CAN 372 certification on at least one product line, as of August 2026. That's based on brand-reported information, not a live check of each certifying body's in-force directory. The sections below cover how to verify a specific model yourself and how 372 differs from performance standards like NSF/ANSI 42, 53, and 58.

What NSF/ANSI 372 Actually Certifies

NSF/ANSI/CAN 372 exists because federal law caps how much lead can be in the parts of a plumbing product that touch your drinking water, at an extremely low level, with an even stricter cap for solder and flux.

That rule covers plumbed-in point-of-use treatment devices, including under-sink filters, faucet-mounted filters, and reverse osmosis systems, not just traditional pipes and fixtures. Non-plumbed products like countertop and pitcher filters aren't subject to that same federal mandate, though manufacturers can and do seek NSF/ANSI 372 certification for them voluntarily.

NSF/ANSI/CAN 372 is the accredited standard labs use to independently verify that a product actually meets that legal limit, rather than taking a manufacturer's word for it.

Why "Lead Free" Doesn't Mean Zero Lead Anywhere

"Lead free" doesn't mean zero lead in every single part. Brass valves and fittings have historically carried a small percentage of lead for machinability, and some certified components still do.

The certification ensures that even if certain brass components contain trace amounts of lead due to manufacturing, the product overall stays well within the federal low-lead materials threshold rather than exceeding it. A "NSF/ANSI 372 certified" badge confirms the product meets that federal limit, not that zero lead exists anywhere inside it, and treating it that way overstates what the certification says.

NSF/ANSI 372 vs. NSF/ANSI 42, 53, and 58

Product pages often stack several NSF/ANSI numbers together (372, 42, 53, 58), and it's easy to assume they all describe the same kind of testing. They don't.

If you're shopping specifically to get lead out of your drinking water, the certification to look for is a lead-reduction claim under NSF/ANSI 53 or, for an RO system, under NSF/ANSI 58, not NSF/ANSI 372 on its own. A product listing all four numbers is reporting four different, independently earned certifications, not one broad "certified" stamp.

How to Verify a Brand's NSF/ANSI 372 Certification Yourself

NSF/ANSI 372 isn't only issued by NSF International, a detail that trips up a lot of shoppers researching this on their own. Several accredited certification bodies test and certify products against the same standard, including NSF International, IAPMO R&T, the Water Quality Association (WQA), Intertek, and UL/CSA.

That's why searching a brand's name on NSF's own public database (info.nsf.org/Certified/Lead_content) can turn up nothing, even for a brand with a legitimate 372 certification. If that brand's certificate was actually issued by IAPMO R&T, WQA, or another accredited certifier instead, NSF's database simply won't show it.

To check a specific model yourself:

1. Get the exact model number, not just the brand or series name. Certifications are issued per model, and a certified flagship doesn't mean every product in a lineup carries the same certification.
2. Identify the certifying body named on the product's certificate or compliance documentation, since that determines which directory to search.
3. Search that certifier's own public listing directory by manufacturer and model: NSF International's directory at info.nsf.org, IAPMO R&T's Product Listing Directory at pld.iapmo.org, or WQA's Gold Seal directory at find.wqa.org.
4. Confirm the standard listed is 372 (not just 42, 53, or 58) and check that the listing is current rather than expired.

Not every certifier publishes a fully self-service public search for every product category. When a live directory search isn't available, ask the brand for the actual signed certificate or Authorization to Mark. That document will name the exact model and confirm the certifying lab directly.

Keep in mind that a dated certificate only confirms the certifying lab and scope as of the date it was signed. It doesn't confirm that the listing is still current today. A live directory check is still the more reliable source when one is available.

Water Filter Brands That List NSF/ANSI 372 Certification

Certifications are tied to exact models and change over time, so treat this table as a starting point for your own verification, not a substitute for checking the certifier's current listing before you buy.

Viomi

Viomi's current under-sink lineup lists NSF/ANSI/CAN 372 certification across every price tier, from the entry-level carbon filter to the flagship RO system. For the Viomi M1, Viomi V8 PRO, Viomi V6 PRO, and Viomi B6W RO systems, that certification is issued through Intertek, according to the brand's internal compliance documentation.

The entry-level carbon filter also lists 372 on its product page. The certifying body isn't named there or in any documentation Viomi has published externally. Shoppers who want that specific detail confirmed can ask Viomi customer support for the signed certificate before buying.

Even without that certifying body confirmed, the fact that 372 shows up on the entry-level carbon filter's own page is still meaningful. The lead-content materials standard isn't reserved for the most expensive model in the lineup. It's a baseline listed across the whole product line.

On the Viomi V8 PRO, Viomi V6 PRO, and Viomi B6W, Viomi backs that materials baseline with the performance side too. Their listed NSF/ANSI 53 certification comes with SGS lab testing that names lead directly as a targeted contaminant, not a generic aesthetic or TDS-only claim standing in for it.

Here's how the certifications, prices, and standards break down model by model, so you can see exactly what each one does and doesn't carry.

The Viomi M1 ($799.99), the brand's flagship tankless under-sink RO system, is currently listed as certified to NSF/ANSI 42, 58, and 372. Its product page does not list a separate NSF/ANSI 53 certification. That's worth knowing if you're specifically looking for that listing, rather than assuming every Viomi model carries an identical certification set.

53 and 58 are independent certification applications, even across RO systems from the same brand. The Viomi M1's own listing covers TDS reduction under 58, rather than a separately certified health-effect lead-reduction claim under 53.

As general background, reverse osmosis membranes as a category of technology are widely understood in water treatment to be effective against dissolved metals like lead. That's a point about how RO works in general, though, not a certified, model-specific claim for the Viomi M1 itself. If having that specific NSF/ANSI 53 listing on paper matters to you, the Viomi V8 PRO, Viomi V6 PRO, and Viomi B6W below carry it as part of their standard certification set.

The Viomi V8 PRO ($479.99) and Viomi V6 PRO ($379.99) are both currently listed as certified to NSF/ANSI 42, 53, 58, and 372, at 800 GPD and 600 GPD respectively.

Both product pages describe that NSF/ANSI 53 listing in specific terms, rather than a blanket claim. SGS testing under the standard names lead directly among the contaminants each system is proven to target, alongside PFAS compounds, copper, arsenic, nitrate, and fluoride.

The Viomi B6W ($249.99), a more compact 600 GPD tankless RO system, carries the same 42/53/58/372 set. Its product page cites a specific figure here: SGS testing under that combined NSF/ANSI 42/53/58 standard puts its lead and copper reduction rate above 99.8%. That's a concrete performance number to weigh alongside the 372 materials certification, rather than in place of it.

For a non-RO option, Viomi sells two entry-level 0.5-micron under-sink carbon filters that differ mainly in installation. The version with a dedicated faucet is $78.99, while the direct-connect version that plumbs into an existing kitchen faucet is $66.99. Both are listed as certified to NSF/ANSI 42, 53, and 372, without the RO-specific 58 listing that doesn't apply to a carbon-only system.

Waterdrop

Waterdrop's tankless under-sink RO system, the G3P800, is certified by IAPMO R&T to NSF/ANSI 42, 53, 58, and 372. It's one of the more direct format comparisons to Viomi's current under-sink RO lineup: similar tankless design, similar certification stack, and a similar target buyer who wants both performance and materials-safety documentation on the same product.

APEC

APEC's tankless ROTL series (including the ROTL-A1000 and ROTL-A1000ALK) carries IAPMO certification to NSF/ANSI 58 and 372, a narrower stack than the four-standard combinations several other brands in this list carry. It's still a useful point of comparison if you're specifically weighing 372-certified tankless systems against each other rather than against tank-based competitors.

AquaTru

AquaTru's countertop RO systems plug into an outlet with no permanent plumbing connection, an installation style suited to renters or anyone who doesn't want to drill into a cabinet or countertop. The line carries IAPMO certification to NSF/ANSI 42, 53, 58, 401, and 372, giving it one of the broader certification stacks among countertop-format filters. The tradeoff against an under-sink system is counter space, since filtered water collects in a reservoir rather than running on demand to a dedicated faucet.

Culligan (MaxClear)

Culligan's MaxClear gravity system doesn't need electricity or a plumbing connection, and it's IAPMO certified to NSF/ANSI 42, 53, 401, and 372. It's a useful example that 372 isn't an RO-only certification. Gravity filters have their own wetted parts (spigots, reservoirs, filter housings) that are just as much in scope for the lead-content standard.

Clearly Filtered

Clearly Filtered's Filtered Water Pitcher is certified by NSF International itself, rather than IAPMO or WQA, to NSF/ANSI 42 and 372. Its broader lead and PFAS reduction claims come from separate independent lab testing run to NSF/ANSI 53 and 401 protocols rather than a formal certification to those two standards, a distinction the brand's own support documentation states directly. In other words, testing a product against a standard's methodology isn't the same as holding a formal certification to that standard, and Clearly Filtered draws that line clearly in its own documentation.

BOROUX

BOROUX's Legacy gravity systems, paired with its Foundation Filters, are certified by WQA to NSF/ANSI/CAN standards 42, 401, and 372. Like Culligan's MaxClear, this shows the standard applying outside the RO and under-sink categories most shoppers default to when they hear "NSF certified."

Do You Actually Need to Shop for NSF/ANSI 372 Specifically?

For most households, NSF/ANSI 372 shouldn't be the certification you lead with when comparing filters. It's a materials-safety baseline worth confirming if you're already worried about older plumbing components and want assurance that a newly installed filter's own housing and fittings won't add another low-quality, lead-containing part on top of that concern. On its own, though, it says nothing about whether the filter will actually reduce lead, chlorine, PFAS, or anything else already in your water.

Prioritize the performance certification that matches your actual concern instead. Look for NSF/ANSI 53 or 58 if lead, PFAS, or other health-effect contaminants are your concern, or NSF/ANSI 42 for chlorine taste and odor. Treat 372 as a secondary check once you've narrowed your options on performance grounds.

FAQ

Does NSF/ANSI 372 certification mean a water filter removes lead from water?

No. NSF/ANSI 372 verifies that the wetted parts of the certified product meet the federal "lead free" limit. Removing lead already present in your tap water is a separate claim, certified under NSF/ANSI 53 or 58, and only when lead reduction is an explicit listed claim on that specific model's certificate.

Is NSF/ANSI 372 required by law?

The underlying "lead free" limit it verifies is required by federal law for any product that conveys or dispenses water for human consumption in the US. NSF/ANSI 372 is the accredited standard manufacturers use to get independent, third-party proof of compliance with that legal requirement.

What's the exact lead limit under NSF/ANSI 372?

Federal rules cap the lead content of wetted surfaces at 0.25%, with an even tighter 0.2% limit for solder and flux, calculated as an average across the product's water-contact parts.

Does NSF International have to be the certifier for a product to carry NSF/ANSI 372 certification?

No. NSF International, IAPMO R&T, WQA, Intertek, and UL/CSA are all accredited to certify products against NSF/ANSI/CAN standards, including 372. Check the certifier named on the product's own documentation, then search that specific body's directory.

Does NSF/ANSI 372 cover the whole filter system, or just certain parts?

It covers the wetted surfaces, meaning the components that actually contact the water, such as housings, fittings, valves, and faucet bodies. The certificate for a given model will specify exactly which components were evaluated.

Which Viomi products currently carry NSF/ANSI 372 certification?

As checked in August 2026, the Viomi M1, Viomi V8 PRO, Viomi V6 PRO, and Viomi B6W reverse osmosis systems and both of Viomi's entry-level under-sink carbon filters are all listed as NSF/ANSI 372 certified on their official product pages, though the exact combination of additional standards (42, 53, 58) varies by model.

Bottom Line

A "372 certified" label tells you what a filter's own hardware is made of, not what it takes out of your water. The housings, valves, and fittings in a certified unit were built and tested to stay under the federal low-lead limit, so the filter's own parts aren't introducing lead beyond that limit as your water passes through.

Whether that filter can pull lead that's already dissolved in your tap water back out is a completely separate question, one that NSF/ANSI 53 or 58 answers, and only for models where a lead-reduction claim is explicitly listed on the certificate.

Viomi's current RO and carbon-filtration lineup, along with Waterdrop, APEC, AquaTru, Culligan's MaxClear line, Clearly Filtered's pitcher, and BOROUX's gravity systems, are all described as 372 certified on their official product pages and published documentation as of this writing. On its own, that's a reasonable baseline to look for, but it isn't the certification that tells you whether a filter solves the problem you're actually shopping for.

So use the distinction, don't just note it. If lead in your water is the reason you're reading this, don't stop at a 372 badge on any brand's listing, including Viomi's. Confirm the exact model in the relevant certifier's directory. Then look for a 53 or 58 listing that names lead as a tested claim, rather than assuming it's implied.

Viomi V8 PRO, Viomi V6 PRO, and Viomi B6W already give you that second piece on their own product pages: a 372 materials certification paired with an NSF/ANSI 53 listing backed by SGS lab testing that names lead directly, down to a specific reduction figure on the Viomi B6W's own page. That level of detail leaves buyers with less to infer from a materials-safety badge alone.