Clearly Filtered and ZeroWater consistently top independent testing for the sheer number and range of contaminants removed among pitcher-style filters. Clearly Filtered claims reduction of over 365 contaminants, while ZeroWater achieves 100% PFAS removal and over 99% fluoride reduction in lab testing. The best choice depends on which specific contaminants concern you most, since no single pitcher excels at everything.
Top Performers in Independent Testing
The Environmental Working Group tested popular pitcher filters specifically for PFAS removal, the “forever chemicals” now regulated by the EPA. Three pitchers achieved 100% removal of tested PFAS compounds: ZeroWater, Clearly Filtered, and the Travel Berkey. The Epic Pure pitcher came close at 98%. After that, performance dropped sharply. PUR PLUS removed 79%, the standard Brita pitcher managed 66%, and the Brita Elite, despite being marketed as a premium filter, reduced only 22% of total PFAS.
For fluoride, a 2025 study published in the Journal of Public Health Dentistry tested several pitchers and found that Clearly Filtered removed over 99.5% of fluoride, ZeroWater removed over 99%, and the Epic Pure pitcher removed over 98.4%. Most other pitcher filters, including Brita and PUR, are not designed to reduce fluoride at all. The researchers noted that no filter completely eliminated fluoride to zero, but those three came very close.
For lead, the Brita Elite filter reduces 99% according to its NSF certification testing. Clearly Filtered and ZeroWater also hold NSF/ANSI 53 certification for lead. To earn that certification, a filter must reduce lead from 150 parts per billion (ten times the EPA’s action level) down to 5 ppb or less.
What NSF Certifications Actually Tell You
Filter companies throw around certification numbers, and they can be confusing. Here’s what the main standards cover:
- NSF/ANSI 42 covers aesthetic issues: chlorine taste and odor, particulates, iron, manganese, and zinc. This is the baseline. Nearly every pitcher filter meets it.
- NSF/ANSI 53 covers health-related contaminants: lead, certain parasites, volatile organic compounds, and chromium, among over 50 possible claims. This is the standard that matters most for safety.
- NSF/ANSI 401 covers emerging contaminants: prescription drugs, over-the-counter medications, herbicides, and pesticides. Fewer filters carry this one.
- NSF/ANSI P473 covers PFAS compounds specifically.
A filter certified under all four standards covers a much broader range of contaminants than one certified only under 42 and 53. Clearly Filtered holds certifications across multiple NSF standards, which is one reason it leads in total contaminant count. ZeroWater’s strength is its five-stage filtration that strips nearly all dissolved solids from water, though this aggressive approach also removes beneficial minerals like calcium and magnesium.
Why PFAS Removal Matters Now
In April 2024, the EPA finalized the first-ever national limits for PFAS in drinking water. The maximum contaminant levels are set at 4 parts per trillion for PFOA and PFOS, the two most studied forever chemicals, and 10 parts per trillion for three additional PFAS compounds (PFHxS, PFNA, and HFPO-DA). These are extraordinarily low thresholds. Water utilities have until 2029 to comply, which means your tap water may still contain PFAS above these limits for years.
A pitcher filter that achieves 100% PFAS removal in testing, like ZeroWater or Clearly Filtered, provides meaningful protection in the interim. A filter removing only 22% to 66% of PFAS, like the Brita models tested by EWG, leaves a significant amount behind.
The TDS Meter Trick
ZeroWater includes a TDS (total dissolved solids) meter with every pitcher, and it makes for an impressive demonstration. Fresh tap water might read 200 to 400 ppm, while filtered water reads 000. This looks like proof of pure water, but TDS meters have a major blind spot: they only detect dissolved ions like minerals, salts, and metals. They cannot detect non-ionic compounds like pesticides, pharmaceuticals, sugars, or many organic pollutants. A glass of water could read 000 on a TDS meter and still contain dissolved organic contaminants.
This doesn’t mean ZeroWater is a bad filter. It performs extremely well in independent lab testing. But the TDS reading alone isn’t evidence of comprehensive contaminant removal. Look at certified lab results, not the number on the meter.
How the Major Pitchers Compare
Here’s a practical breakdown of the leading options:
Clearly Filtered offers the broadest contaminant reduction of any pitcher. It holds certifications for PFAS, lead, fluoride, pharmaceuticals, herbicides, and pesticides. In lab testing, it achieved 100% PFAS removal and over 99.5% fluoride removal. The trade-off is cost: replacement filters run around $50 each and last roughly four months, making it the most expensive pitcher to maintain.
ZeroWater matches Clearly Filtered on PFAS (100% removal) and comes close on fluoride (over 99%). Its five-stage filter is aggressive, stripping virtually all dissolved solids. Filters cost less individually but need replacement more frequently, especially in areas with hard water. You may notice a slightly acidic or flat taste since beneficial minerals are also removed.
Epic Pure is a strong middle option at 98% PFAS removal and over 98.4% fluoride removal. It’s less widely available than ZeroWater or Clearly Filtered but performs well across multiple contaminant categories.
Brita Elite excels at lead (99% reduction) and is widely available at a low price point. But its PFAS performance is poor at just 22%, and it doesn’t claim fluoride reduction. If lead is your primary concern and your water utility already treats for PFAS, this could be sufficient. For broader protection, it falls short.
PUR PLUS sits in the middle of the pack at 79% PFAS removal. It’s a reasonable budget option that outperforms Brita on forever chemicals but doesn’t match the top three.
Choosing Based on Your Water
The “best” pitcher depends on what’s actually in your water. If you’re on a municipal supply, your utility publishes an annual Consumer Confidence Report listing detected contaminants. The EWG also maintains a tap water database searchable by zip code that flags contaminants above health guidelines, which are often stricter than legal limits.
If your main concern is lead from old pipes, a Brita Elite or any NSF 53-certified pitcher handles it well. If you’re worried about PFAS, you need Clearly Filtered, ZeroWater, or Epic Pure. If you want fluoride removal (common among parents mixing infant formula, since excess fluoride can cause dental fluorosis in young children), those same three are your only real pitcher options.
For the broadest possible protection from a single pitcher, Clearly Filtered covers the most ground. For the lowest cost per contaminant removed, ZeroWater offers similar performance at a lower upfront price, though filter replacement frequency can close that gap over time. Both dramatically outperform mainstream options like Brita and PUR on the contaminants that matter most for long-term health.