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Does Clearly Filtered Remove PFAS? Here Is What the Data Actually Shows
PFAS, the class of synthetic chemicals known as forever chemicals, do not filter out of water easily. Most pitcher filters do not remove them at all. The question buyers ask before spending $90 to $100 on a Clearly Filtered pitcher is whether the PFAS removal claims are real and how well the filter actually performs against the specific compounds the EPA now regulates.
This article covers what Clearly Filtered's certifications and lab data actually say, which PFAS compounds are covered, how that compares to the EPA's 2024 limits, and what the data gaps look like.
Short Answer
Yes, Clearly Filtered removes PFAS. Specifically:
- PFOA: Greater than 99.00% reduction (IAPMO NJ ISO 17025 lab test at 0.5 ppb influent; WQA certified)
- PFOS: Greater than 99.50% reduction (IAPMO NJ lab test at 1 ppb influent; WQA certified)
- Additional PFAS compounds: PFBS, PFHpA, PFHxS, PFNA, PFHxA covered in published third-party testing data
These are not manufacturer claims without support. The WQA (Water Quality Association) certification for PFOA and PFOS uses the same NSF/ANSI P473 test protocols as NSF International's certification program. IAPMO NJ is an ISO 17025 accredited laboratory.
What PFAS Is and Why It Is Hard to Remove
PFAS stands for per- and polyfluoroalkyl substances. The term covers thousands of synthetic chemicals with a carbon-fluorine bond, which is one of the strongest bonds in organic chemistry. That bond strength is why they persist in the environment, in soil, in water, and in human tissue without breaking down under normal conditions.
PFAS compounds were used extensively from the 1940s through the early 2000s in non-stick cookware, food packaging, firefighting foam (AFFF), stain-resistant fabrics, and waterproof coatings. They leached into groundwater near manufacturing sites, military bases, airports, and landfills. Studies linking PFAS exposure to cancer, thyroid disruption, immune function changes, and developmental effects in children drove increasing regulatory attention.
Removing PFAS from water is technically challenging because the compounds are chemically inert, hydrophilic (water-soluble), and present at very low concentrations (parts per trillion). Standard activated carbon filters, which most pitchers use, show limited effectiveness against PFAS compounds. Reverse osmosis and specialized activated carbon (like the media in Clearly Filtered's Affinity Filtration Technology) perform better.
The EPA's 2024 PFAS Rule: What the Limits Actually Are
In April 2024, the EPA finalized the first-ever enforceable maximum contaminant levels (MCLs) for PFAS in public drinking water. These are the limits that matter for understanding whether a filter is adequate.
| Compound | EPA MCL (parts per trillion) | Regulation type |
|---|---|---|
| PFOA | 4 ppt | Individual MCL |
| PFOS | 4 ppt | Individual MCL |
| PFNA | 10 ppt | Individual MCL |
| PFHxS | 10 ppt | Individual MCL |
| HFPO-DA (GenX) | 10 ppt | Individual MCL |
| PFBS + mixture | Hazard Index (combined) | Mixture-based limit |
Public water systems have until 2029 to comply with these limits. Until then, some systems may continue delivering water that exceeds EPA MCLs. If you are on a private well, the EPA rule does not apply to your water at all, which means the responsibility for testing and filtering falls entirely on you.
Clearly Filtered's PFAS Coverage Against the EPA Compounds
Cross-referencing Clearly Filtered's published testing data against the six compounds covered by the EPA's 2024 MCL rule:
| EPA-regulated compound | Clearly Filtered coverage | Source |
|---|---|---|
| PFOA | Greater than 99.00% reduction | WQA certified + IAPMO NJ lab |
| PFOS | Greater than 99.50% reduction | WQA certified + IAPMO NJ lab |
| PFNA | Covered in published testing | Clearly Filtered performance data |
| PFHxS | Covered in published testing | Clearly Filtered performance data |
| HFPO-DA (GenX) | Not specifically listed in published data | No specific data available |
| PFBS | Covered in published testing | Clearly Filtered performance data |
Five of the six EPA-regulated compounds have coverage in Clearly Filtered's data. HFPO-DA (GenX chemicals) is the one gap in the published testing. GenX contamination is primarily associated with specific industrial sites (most notably the Chemours Cape Fear plant in North Carolina). If you live in a region with documented GenX contamination, contact Clearly Filtered directly for updated testing data or consider an under-sink RO system with specific GenX testing.
What WQA Certification Means (and What It Does Not)
The WQA certification for Clearly Filtered is frequently misunderstood. Here is the accurate picture.
The Water Quality Association is a non-profit trade association and third-party testing organization. WQA Gold Seal certifications for PFAS use the NSF/ANSI P473 test protocol, the same standard NSF International uses. Having WQA certification means the filter was tested by an accredited lab using NSF P473 methodology and met the performance requirements.
What it does not mean: WQA certification is not the same as the NSF International certification mark that appears in NSF's public online certification database. If you search NSF's database for Clearly Filtered, you will see the NSF/ANSI 42 + 372 listing (chlorine and lead-free materials) but not a P473 listing. The WQA certification is separate from that database.
For buyers at institutions or in settings that specifically require NSF International certification (not just NSF protocol testing), this distinction matters. For most residential buyers who simply need credible independent verification that the filter removes PFAS, the WQA certification is meaningful evidence.
IAPMO NJ Lab Testing: How to Read the Numbers
Most of Clearly Filtered's PFAS data beyond PFOA and PFOS comes from IAPMO NJ, an ISO 17025 accredited laboratory. These test reports are published on the Clearly Filtered website under Performance Data.
The numbers represent single-pass reductions at the specific influent concentrations used in the test. For PFOA, the influent concentration used was 0.5 ppb (500 ppt). The filter achieved greater than 99.00% reduction at that concentration.
What this means in practice: if your tap water has PFOA at 50 ppt (well above the EPA's 4 ppt limit), a 99% reduction would bring it to 0.5 ppt, well below the limit. At concentrations closer to the EPA MCL (4 to 10 ppt), the same percentage reduction would result in sub-detection-limit output.
The important caveat: lab testing uses challenge concentrations that may differ from real-world levels. The 0.5 ppb challenge concentration for PFOA is 125 times higher than the EPA MCL. Real-world performance at the very low concentrations common in contaminated city water cannot be directly extrapolated from these numbers with certainty. That said, filter media that achieves 99%+ reduction at high influent concentrations generally performs well at lower concentrations too, as the contaminant-to-media contact is less demanding.
How Clearly Filtered Compares to Other PFAS Pitcher Options
The gravity pitcher market for PFAS removal is thin. Most pitchers on the market either do not test for PFAS or cannot demonstrate meaningful removal. Here is where the main options stand.
| Pitcher | PFAS coverage | Certification basis | Annual filter cost |
|---|---|---|---|
| Clearly Filtered | PFOA greater than 99%, PFOS greater than 99.5%, 5+ additional compounds | WQA certified P473 + IAPMO NJ lab | ~$165 to $210 |
| ZeroWater | Select PFAS (NSF 401) | NSF 401 certified (covers fewer compounds) | $150 to $400+ (TDS-dependent) |
| Brita Elite | None tested or certified | Not applicable | ~$36 to $48 |
| PUR Plus | None tested or certified for PFAS | Not applicable | ~$40 to $60 |
| Epic Pure | PFAS covered in published lab data | Third-party lab data (not WQA certified) | ~$40 to $60 |
ZeroWater's NSF 401 certification covers PFAS, but NSF 401 includes a limited list of emerging contaminants and is not a comprehensive PFAS certification. ZeroWater also has a variable and often high annual cost due to filter life shortening with higher TDS water.
Epic Pure is the strongest alternative to Clearly Filtered for PFAS-concerned buyers on a budget. Epic publishes third-party lab data for PFAS removal and the filter costs significantly less than Clearly Filtered's replacement filters. The tradeoff is that Epic's data does not carry WQA certification.
Who Needs a PFAS Filter
PFAS is not uniformly distributed in drinking water across the country. Whether you need a PFAS-specific filter depends heavily on your source water.
You are likely at higher risk if
- Your water comes from a municipality near a military base, airport, or industrial site that used AFFF firefighting foam
- Your municipality's Consumer Confidence Report shows any PFAS detections, even below the MCL
- You are on a private well in a region with known PFAS groundwater contamination
- You are near a manufacturing plant that produced or used fluoropolymers or PFAS-containing products
You are likely at lower risk if
- Your municipality's Consumer Confidence Report shows non-detect for all PFAS compounds tested
- You are on a private well in a rural area with no industrial PFAS sources nearby
- You have tested your water recently through a certified lab and PFAS came back non-detect
If you do not know your PFAS exposure status, the EPA's PFAS Analytic Tools website (epa.gov/pfas/pfas-analytic-tools) provides an interactive map of known PFAS contamination sites. Your state's environmental agency may also have public data on water system PFAS testing results.
Does the Filter Performance Decline for PFAS Over Time?
This is an important question that filter manufacturers rarely address directly. Clearly Filtered's published testing is conducted at 100% of rated filter life (100 gallons) as well as at 200% of rated filter life. The testing at 200% capacity is designed to verify the filter does not significantly degrade PFAS performance even when used past its rated life.
The PFAS compounds being tested are large molecules with high affinity for the activated carbon and other media in the filter. Unlike chlorine, which can break through a loaded carbon filter relatively quickly, PFAS compounds tend to bind tightly to activated carbon and are not easily displaced by other contaminants.
That said, the standard recommendation is to replace the filter at the rated 100-gallon mark and not rely on the 200% testing as a reason to extend filter life. The 200% testing validates safety margin, not operational license.
Under-Sink and Countertop RO as Alternatives
A gravity pitcher is not the only option for PFAS-contaminated water. If your household has documented PFAS contamination and you want more comprehensive treatment, a reverse osmosis system is the higher-performance choice.
Under-sink RO systems that are certified for PFAS removal (NSF/ANSI 58 or P473) typically achieve 90% to 99%+ PFAS removal and have a much higher daily output than a gravity pitcher. Annual filter costs are often lower once the system is installed. The tradeoff is upfront installation cost ($200 to $500 for most systems) and the need to modify your sink plumbing.
Clearly Filtered also sells a 3-stage under-sink system (approximately $495) with separate performance data showing 99.81% PFOA/PFOS removal across its 2,000-gallon filter life. If you own your home and can install under-sink, it is worth comparing the Clearly Filtered under-sink system to competitor RO options at a similar price point before defaulting to the pitcher.
For renters or anyone without plumbing access, the Clearly Filtered pitcher remains the strongest no-install PFAS filter option in the gravity pitcher category.
Frequently Asked Questions
Does Clearly Filtered remove PFAS?
Yes. The pitcher is WQA-certified for PFOA and PFOS reduction using NSF/ANSI P473 test protocols, with greater than 99.00% PFOA and greater than 99.50% PFOS reduction in independent IAPMO NJ lab testing. Additional PFAS compounds including PFBS, PFHpA, PFHxS, PFNA, and PFHxA are covered in the brand's published third-party testing data.
Is the Clearly Filtered pitcher NSF certified for PFAS?
The Clearly Filtered pitcher carries WQA certification for PFOA and PFOS using NSF/ANSI P473 test protocols. The WQA is a separate certifying body from NSF International but applies the same P473 testing standard. It does not carry a formal NSF International P473 certification mark.
What PFAS does Clearly Filtered remove?
Published testing covers PFOA, PFOS, PFBS, PFHpA, PFHxS, PFNA, and PFHxA. The EPA's 2024 rule covers PFOA, PFOS, PFNA, PFHxS, HFPO-DA (GenX), and PFBS. Clearly Filtered's data addresses five of those six compounds. GenX (HFPO-DA) is not specifically listed in published data.
What are the EPA PFAS limits?
The EPA finalized PFAS MCLs in April 2024: 4 ppt for PFOA, 4 ppt for PFOS, 10 ppt for PFNA, 10 ppt for PFHxS, 10 ppt for HFPO-DA, and a Hazard Index mixture limit including PFBS. Public water systems have until 2029 to comply.
How do I know if PFAS is in my water?
Check your municipality's Consumer Confidence Report for PFAS testing results. The EPA's PFAS Analytic Tools map at epa.gov/pfas/pfas-analytic-tools shows known contamination sites. Private well owners need a certified lab test. PFAS has no taste, odor, or color at the concentrations found in drinking water.
Does Clearly Filtered remove more PFAS than Brita?
Yes, significantly. Brita Standard and Elite filters are not tested or certified for PFAS removal. For households with documented PFAS in source water, Clearly Filtered is the clearly relevant choice between these two options.
Where to Buy
- Clearly Filtered No. 1 Filtered Water Pitcher (10-cup): Check current price on Amazon
- Clearly Filtered Replacement Filter (Single): Check current price on Amazon
- Clearly Filtered Replacement Filters (3-Pack): Check current price on Amazon
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Related Articles
- Clearly Filtered Pitcher Review: Is It Worth It After 6 Months?
- ZeroWater vs Clearly Filtered: Which Pitcher Actually Removes PFAS?
- Brita Elite vs Clearly Filtered: PFAS and Lead Removal Compared
Bottom Line
Clearly Filtered is the strongest gravity pitcher option for PFAS removal with independently verified data. The WQA certification for PFOA and PFOS and the IAPMO NJ lab data for additional PFAS compounds give it a credible basis that most pitcher competitors cannot match.
For households with documented PFAS contamination and no ability to install an under-sink system, the Clearly Filtered pitcher is a well-supported choice. For households where PFAS testing shows non-detect, it is meaningful overkill on the PFAS front, though it covers a much broader contaminant range including lead, fluoride, and arsenic that may still be relevant.
Test your water before buying any filter. Knowing what is actually in your tap water is more valuable than any filter specification sheet.
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