# Does ZeroWater Filter Remove PFAS? Here's What the Testing Actually Shows

- Author: No More Forever Chemicals
- Published: June 19, 2026
- Last updated: July 7, 2026


## Key takeaways

- Legacy ZeroWater (pre-2025): Certified under NSF/ANSI 53 specifically for PFOA and PFOS — two of the most well-known PFAS compounds, but only two out of the more than 12,000 PFAS chemicals that exist.
- Culligan ZeroWater (2025 relaunch): Independently verified by IAPMO (the certifying body equivalent to NSF) for total PFAS reduction, not just PFOA and PFOS — along with fluoride, lead, mercury, and
- It strips minerals along with contaminants.
- It's slower than a basic Brita. As a gravity filter, expect a full pitcher to take several minutes longer to filter than simpler pitchers.

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**Quick Answer:** It depends on which ZeroWater you own. The newer Culligan ZeroWater pitcher (relaunched in 2025) is independently certified to reduce total PFAS by around 99%. The older, legacy ZeroWater pitcher is only certified under NSF/ANSI 53 for two specific PFAS compounds — PFOA and PFOS — not the broader PFAS family. If you're shopping for a new pitcher today, you're almost certainly getting the newer, more comprehensively certified version.

ZeroWater built its reputation on near-zero TDS (total dissolved solids) readings. Many people assume that means it removes everything, including PFAS. The real answer is more specific than that — and it changed significantly after a 2025 product overhaul. Here's what's actually been tested and verified.

## The Short History You Need to Know

ZeroWater was acquired and relaunched under Culligan branding in 2025. This matters because the testing and certifications are genuinely different between the two versions:

- **Legacy ZeroWater (pre-2025):** Certified under NSF/ANSI 53 specifically for PFOA and PFOS — two of the most well-known PFAS compounds, but only two out of the more than 12,000 PFAS chemicals that exist.
- **Culligan ZeroWater (2025 relaunch):** Independently verified by IAPMO (the certifying body equivalent to NSF) for total PFAS reduction, not just PFOA and PFOS — along with fluoride, lead, mercury, and over two dozen other contaminants.

If you bought your pitcher before 2025, it's worth checking the model and filter packaging to confirm which version you have, since the certification claims aren't interchangeable.

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## So Does It Actually Work?

Independent lab testing using Tap Score's PFAS panel found the Culligan ZeroWater pitcher performed comparably to AquaTru's countertop reverse osmosis systems in overall contaminant reduction, including PFAS. That's a meaningful result. RO has generally been considered the gold standard for PFAS removal, and a gravity pitcher matching that performance is notable.

It's also worth knowing what it doesn't do well:

- **It strips minerals along with contaminants.** Independent testing found the pitcher reduced water pH from a neutral 7.6 down to a slightly acidic 6.6. Unlike AquaTru, there's no optional remineralization filter to add minerals back.
- **It's slower than a basic Brita.** As a gravity filter, expect a full pitcher to take several minutes longer to filter than simpler pitchers.
- **It's not designed for untreated water.** ZeroWater pitchers are built for treated municipal tap water — not well water or water under a boil advisory, which require different filtration entirely.

## ZeroWater vs. Other Pitcher Filters

The honest nuance here: Clearly Filtered carries the NSF/ANSI P473 certification, which is the standard built specifically around PFAS testing protocols. The newer Culligan ZeroWater uses IAPMO verification with strong independent test results but isn't marketed under the same P473 label. Both have credible, independently verified PFAS performance — they're just certified through slightly different pathways. If having that specific P473 label matters to you, Clearly Filtered is the more direct match. If near-zero TDS and broad contaminant reduction is your priority, the newer ZeroWater is a strong option.

[See my recommendations](/non-toxic-products)

## What This Means for Your Buying Decision

If you already own a pre-2025 ZeroWater pitcher, it's still doing meaningful work on PFOA and PFOS — just not the full PFAS picture. Upgrading to the current Culligan version (or switching to Clearly Filtered) gets you broader, more current-standard protection.

If you're buying for the first time, the most useful question to ask before purchasing is: which specific PFAS certification does this product carry? Does the listing actually name a standard (NSF 53, NSF P473, IAPMO) — or just say "removes PFAS" with no certification behind it? That distinction is where most of the marketing confusion in this category comes from.

## Frequently Asked Questions

**Is the new ZeroWater the same as the old one?** No. The 2025 Culligan relaunch significantly expanded PFAS testing and certification compared to the legacy product — they're not interchangeable in terms of what's verified.

**Does ZeroWater remove fluoride too?** The current version is independently tested to reduce fluoride significantly, though the certification language around this has shifted over the years — check current packaging for the specific claim.

**Is reverse osmosis still better than ZeroWater?** Not necessarily anymore. Recent independent testing shows the newer ZeroWater performing comparably to countertop RO systems like AquaTru for overall contaminant reduction, without the water waste RO systems typically produce.

## Understanding PFAS and Its Impact

PFAS, or per- and polyfluoroalkyl substances, are a group of man-made chemicals. They are used in various products for their water- and grease-resistant properties. These chemicals are often found in non-stick cookware, water-repellent clothing, and food packaging. Unfortunately, PFAS are persistent in the environment and human body, leading to potential health risks.

### Health Risks Associated with PFAS

Research indicates that exposure to PFAS may lead to several health issues. These include:

- Increased cholesterol levels
- Changes in liver function
- Impaired immune response
- Increased risk of certain cancers

Understanding these risks can help you make informed choices about the products you use in your home.

## Choosing the Right Water Filter

When selecting a water filter, consider your specific needs. Think about the contaminants you want to remove. Do you prioritize PFAS reduction? Or are you also concerned about other substances like lead or chlorine?

### The Importance of Certification

Always look for filters that have been independently tested and certified. This ensures that the product performs as claimed. Certifications like NSF and IAPMO provide peace of mind. They indicate that the filter has undergone rigorous testing.

## Bottom Line

If you're looking at a current ZeroWater pitcher on the shelf today, you're very likely getting the 2025 Culligan version with verified PFAS reduction performance that rivals countertop RO systems. Just confirm you're not picking up old stock of the legacy version. Decide whether the mineral-stripping tradeoff (and lack of remineralization) is something you're comfortable with for your household.

*Looking for a side-by-side comparison of every certified PFAS filter option? \**[Check out our full water filter guide](/non-toxic-products)**or** [subscribe to our newsletter](https://nomoreforeverchemicals.beehiiv.com/)**for ongoing PFAS research updates**

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Until next time :)

## Questions from this guide

### So Does It Actually Work?

Independent lab testing using Tap Score's PFAS panel found the Culligan ZeroWater pitcher performed comparably to AquaTru's countertop reverse osmosis systems in overall contaminant reduction, including PFAS. That's a meaningful result. RO has generally been considered the gold standard for PFAS removal, and a gravity pitcher matching that performance is notable. It's also worth knowing what it doesn't do well: - It strips minerals along with contaminants.

### What This Means for Your Buying Decision

If you already own a pre-2025 ZeroWater pitcher, it's still doing meaningful work on PFOA and PFOS — just not the full PFAS picture. Upgrading to the current Culligan version (or switching to Clearly Filtered) gets you broader, more current-standard protection. If you're buying for the first time, the most useful question to ask before purchasing is: which specific PFAS certification does this product carry?

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