Berkey and Waterdrop both offer gravity-fed stainless steel filtration systems at the same 2.25-gallon capacity, but they differ significantly in contaminant testing depth, public lab documentation, and price. Waterdrop's King Tank is faster and less expensive upfront. All new Berkey systems ship with Black Berkey Elements as the standard included filter, which are independently tested against 200+ contaminants by EPA-accredited and NSF-accredited third-party laboratories, with publicly downloadable lab reports. Buyers who prioritize filtration transparency and contaminant breadth will find Berkey the stronger choice; buyers who prioritize speed and a lower entry cost will find Waterdrop competitive.
Berkey is the better fit if you:
- Want downloadable third-party lab reports for 200+ contaminants
- Need documented PFAS reduction data (9 compounds tested, PFOA reduced to below 2 ppt)
- Value a 25+ year brand track record with verified media coverage
- Plan to filter more than just chlorine and sediment
- Need multiple system sizes beyond 2.25 gallons
Waterdrop may be a better fit if you:
- Have a tighter upfront budget
- Want faster flow rate (Waterdrop filters at roughly 4 GPH)
- Primarily need chlorine, taste, and odor reduction
- Prefer a metal sight glass spigot included as standard
- Only need a 2.25-gallon countertop system
Brand Background
Berkey is manufactured by New Millennium Concepts Ltd. (NMCL), which has been producing gravity filtration systems since the late 1990s. With more than 25 years in operation, NMCL has built an extensive dealer network and a documented testing history across multiple independent laboratories. BigBerkeyWaterFilters.com is the largest authorized Berkey dealer in the United States. All new Berkey systems ship with Black Berkey Elements as the standard included filter, tested by EPA-accredited and NSF-accredited third-party laboratories against 200+ contaminants. Berkey Phoenix Elements are the current replacement filter option, for households replacing worn Black Berkey Elements, and carry NSF/ANSI 42 and NSF/ANSI/CAN 372 certifications.
Waterdrop is a China-based filtration brand founded in 2015 that has expanded aggressively into the U.S. market. The company sells a broad product line including RO systems, pitcher filters, and gravity-fed countertop units. Its King Tank series is its primary gravity filter product, sold directly through Waterdropfilter.com and through Amazon. Waterdrop has explicitly noted that its products are not sourced by or affiliated with Berkey, though it does separately sell replacement filter cartridges marketed as compatible with Berkey systems. The two companies have no corporate relationship.
Quick Comparison: Berkey vs. Waterdrop King Tank
Scroll right to see full table.
| Feature |
Berkey (Black Berkey Elements — standard) |
Waterdrop King Tank |
| System Capacity |
2.25 gal (Scout) to 6 gal (Crown) |
2.25 gallons only Fewer options
|
| Filter Type |
Proprietary blend of 6+ media types; four filtration mechanisms (microfiltration, adsorption, absorption, ion exchange) |
Natural coconut activated carbon (GAC) |
| Filter Lifespan |
6,000 gal/pair (Black Berkey); 5,500 gal/pair (Phoenix replacement) |
6,000 gal/pair (carbon) |
| Testing / Certifications |
Black Berkey: tested by EPA-accredited and NSF-accredited third-party labs; Phoenix replacement: NSF/ANSI 42 and NSF/ANSI/CAN 372 |
NSF/ANSI 42 (chlorine/taste/odor), NSF/ANSI 372 (IAPMO R&T) |
| Contaminants Tested |
200+ — downloadable lab PDFs Berkey Edge
|
Chlorine, heavy metals, sediment — limited public documentation |
| PFAS Testing |
9 PFAS compounds tested at >99.9% reduction; PFOA reduced to below 2 ppt (below EPA 4 ppt MCL) Berkey Edge
|
Not publicly documented |
| Public Lab Reports |
Yes — downloadable PDFs from accredited labs Berkey Edge
|
Third-party testing referenced but full reports not publicly available |
| Filtration Speed |
1.5 to 3 GPH (varies by elements installed) |
~4 GPH Waterdrop Edge
|
| Fluoride Reduction |
PF-2 add-on filters required for reliable long-term fluoride reduction (up to 99.75%); compatible with both Black Berkey and Phoenix Elements ($103/pair, 1,000 gal) |
Fluoride filter add-on available (1,000 gal capacity) |
| Spigot |
Plastic spigot (standard) |
Metal sight glass spigot (standard) Waterdrop Edge
|
| Cost Per Gallon |
~$0.03 (Black Berkey, $166/pair at 6,000 gal) |
~$0.01 to $0.02 (replacement cost-dependent) Waterdrop Edge
|
| System Price |
Higher upfront — MAP-controlled pricing |
Lower upfront entry cost Waterdrop Edge
|
| Verified Media Coverage |
EWG, Food Network, CBS News, LA Times Berkey Edge
|
Not documented on media page |
| Brand History |
25+ years |
Founded 2015 (10 years) |
Independent Testing and Certifications
Both Berkey and Waterdrop hold NSF/ANSI 42 and NSF/ANSI 372 certifications, but the scope of what those certifications cover differs in important ways.
NSF/ANSI 42 applies to taste, odor, and chlorine reduction. It does not certify reduction of heavy metals, PFAS, pharmaceuticals, or other health-effects contaminants. Both brands carry this certification for their carbon filters.
NSF/ANSI 372 addresses lead-free construction materials in plumbing components. It is a materials safety standard, not a performance standard for contaminant removal. Both brands carry this as well.
Where the two diverge is in performance documentation beyond chlorine. All new Berkey systems ship with Black Berkey Elements, which are tested by EPA-accredited and NSF-accredited third-party laboratories against 200+ contaminants. PFAS testing covers 9 compounds including PFOA, PFOS, PFNA, PFBS, and PFHxS, all reduced at >99.9%, with PFOA brought to below 2 ppt, under the EPA's enforceable 4 ppt MCL. Results are available as downloadable PDFs at BigBerkey Test Results. For households replacing worn Black Berkey Elements, Berkey Phoenix Elements are the current replacement option, tested by NABL-accredited ISO/IEC 17025:2017 certified laboratories, with those results at the Phoenix Lab Results page.
Waterdrop states its King Tank is tested by a third-party laboratory for chlorine and heavy metals, but publicly available documentation for that testing is limited. No downloadable performance test reports for the King Tank's contaminant reduction across a broad spectrum were found on Waterdrop's website. Buyers who want to verify specific contaminant reduction data should request documentation directly from Waterdrop before purchasing.
Contaminant Category Comparison
The table below compares documented contaminant reduction across major categories. Black Berkey data is sourced from independent lab reports available at BigBerkey Test Results. Waterdrop data reflects publicly available information from Waterdropfilter.com and product listings.
Scroll right to see full table.
| Contaminant Category |
Black Berkey Elements (standard) |
Waterdrop King Tank |
| PFAS / Forever Chemicals |
9 compounds tested (PFOA, PFOS, PFNA, PFDA, PFBS, PFHxS, PFHxA, PTFE, Fluorotelomer 8:2) — all at >99.9%; PFOA reduced to below 2 ppt (below EPA 4 ppt MCL). Downloadable lab report available. Documented
|
PFAS reduction referenced on some product listings. No publicly available lab report found confirming specific PFAS compound results. |
| Heavy Metals |
20+ metals tested including lead (>99.9%), mercury (>99.9%), arsenic (>99.9%), chromium VI (>99.8%), cadmium (>99.7%). Results consistent at both pH 6.5 and pH 8.5. Downloadable lab report available. Documented
|
Heavy metal reduction claimed. Third-party testing referenced but no downloadable lab report found on Waterdrop's website. |
| Pharmaceuticals and Emerging Contaminants |
17 compounds tested including ibuprofen, acetaminophen, BPA, caffeine, antibiotics, and hormones — all at >99.5%. Downloadable lab report available. Documented
|
No pharmaceutical reduction claims or testing data found publicly. |
| Volatile Organic Compounds (VOCs) |
54 compounds tested including benzene, chloroform, toluene, TCE, MTBE, carbon tetrachloride, haloacetic acids — 99.60% to >99.99% reduction. Downloadable lab report available. Documented
|
No VOC reduction claims or testing data found publicly. |
| Pesticides and Herbicides |
40+ compounds tested including atrazine, chlordane, DDT, simazine, PCBs, glyphosate — >99.9% across most. Downloadable lab report available. Documented
|
No pesticide reduction claims or testing data found publicly. |
| Petroleum Contaminants |
Gasoline, diesel, crude oil, kerosene, mineral spirits, refined oil, and MCHM — all at >99.9%. Downloadable lab report available. Documented
|
No petroleum contaminant claims or testing data found publicly. |
| Radiologicals |
Gross alpha emitters at >98.7% (radium, uranium, plutonium, polonium); gross beta emitters at >95.3% (cesium-137, strontium-90, iodine-131). Downloadable lab report available. Documented
|
No radiological reduction claims or testing data found publicly. |
| Disinfectants (Chlorine and Chloramines) |
Free chlorine >99.9%; chloramines >99.9%; total chlorine >87.5%. NSF/ANSI 42 certified for chlorine, taste, and odor. Both Documented
|
Up to 99% chlorine reduction. NSF/ANSI 42 certified for chlorine, taste, and odor. Chloramine data not publicly documented. |
| Fluoride |
Black Berkey Elements do not provide reliable long-term fluoride reduction. PF-2 add-on filters are required for consistent fluoride removal, reducing fluoride up to 99.75%. PF-2 filters are compatible with both Black Berkey and Berkey Phoenix Elements ($103/pair, 1,000 gal capacity). |
Fluoride reduction available via add-on filter (1,000 gal capacity). Reduction rate claimed at approximately 98%. |
| Algae Toxins |
Microcystin LR toxin reduced to non-detectable levels (>99.7%). Microcystis algae cells reduced from over 1 million cells/mL to fewer than 1 cell/mL. ISO 17025 accredited lab. Downloadable lab report available. Documented
|
No algae toxin claims or testing data found publicly. |
Sources: Black Berkey data from independent lab reports by Envirotek Laboratories (EPA ID #NJ01298), County of Los Angeles ETL (CA State DHS certified), and BCS Laboratory (ISO 17025:2005, NELAP/TNI accredited). Waterdrop data from Waterdropfilter.com and product listings as of 2025. "Not publicly documented" indicates no downloadable third-party test report was found — it does not necessarily mean the filter does not reduce that contaminant.
Certification Summary
Both brands share NSF/ANSI 42 and 372. The meaningful gap is in publicly accessible, broad-spectrum performance testing: Black Berkey Elements (standard in all new systems) are tested by EPA-accredited and NSF-accredited third-party labs against 200+ contaminants, including 9 PFAS compounds all reduced at >99.9%, with PFOA to below 2 ppt. Waterdrop does not provide equivalent documentation publicly.
Media Recognition
Berkey's presence in third-party editorial coverage is documented and verifiable. Every citation on the Berkey Media Coverage page links directly to the original article.
Waterdrop's website does not display a media recognition section with links to independent editorial coverage of the King Tank. Independent reviews of the system exist on third-party sites but are not curated or documented by Waterdrop directly.
Feature Comparisons
Filtration Speed
This is one of the clearest advantages Waterdrop holds. The King Tank filters at roughly 4 gallons per hour, which is faster than most gravity systems in this class. Berkey systems with Black Berkey Elements installed typically run at 1.5 to 3 GPH depending on water quality, the number of elements installed, and the filter's usage age. For households that refill frequently or want faster turnaround, the Waterdrop King Tank has a measurable speed edge.
Fluoride Reduction
Black Berkey Elements do not provide reliable long-term fluoride reduction on their own. For consistent fluoride removal, Berkey's PF-2 Fluoride and Arsenic Reduction filters are required, reducing fluoride up to 99.75%. PF-2 filters ($103/pair) are compatible with both Black Berkey Elements and Berkey Phoenix Elements, rated for 1,000 gallons per pair, and screw directly onto the bottom of each gravity element. Waterdrop also sells fluoride filter add-ons for the King Tank at a lower price point, rated for 1,000 gallons per pair. At approximately 1 gallon of daily household use, the 1,000-gallon threshold is reached before the 1-year mark, making fluoride filter replacement on both systems effectively annual.
System Size Options
Berkey offers multiple system sizes, from the 2.25-gallon Scout up to the 6-gallon Crown, giving households of different sizes more flexibility. Waterdrop's King Tank is available only in the 2.25-gallon configuration. If you need capacity beyond 2.25 gallons, Berkey is the only option between the two brands.
Spigot Design
The Waterdrop King Tank includes a metal sight glass spigot as standard equipment, which allows real-time water level monitoring via a red float ball. Berkey systems ship with a plastic spigot. Metal spigots generally offer better durability and Waterdrop's design adds a functional convenience feature. Berkey does sell stainless steel spigot upgrades separately for buyers who prefer metal.
Warranty
Berkey's stainless steel system hardware (chambers, lid, spigot components) carries a lifetime limited warranty. Black Berkey Elements carry a 2-year prorated manufacturer warranty. Berkey Phoenix Elements, the current replacement filter option, also carry a 2-year prorated warranty. PF-2 filters carry a 6-month manufacturer warranty. Waterdrop offers a 30-day return window and standard warranty coverage, though specific terms vary by product and should be confirmed directly with Waterdrop at time of purchase.
Long-Term Cost Comparison
Filter replacement economics matter more than system purchase price over a multi-year ownership window.
Berkey (Black Berkey Elements)
~$0.03
per gallon filtered
$166/pair at 6,000 gal = ~$0.028/gal
Ships standard with all new Berkey systems
Replacement option: Berkey Phoenix Elements ($120/pair, 5,500 gal)
Add PF-2 for fluoride: $103/pair at 1,000 gal
Waterdrop King Tank
~$0.01
per gallon filtered (est.)
Carbon replacement pair priced lower than Black Berkey Elements
6,000 gal/pair carbon, 1,000 gal/pair fluoride (same intervals)
Check current pricing at Waterdropfilter.com
Waterdrop's lower filter replacement cost is a genuine long-term advantage for price-sensitive buyers. However, cost-per-gallon only tells part of the story: what contaminants are being reduced at that cost matters equally. Black Berkey Elements, which ship standard with all new Berkey systems, are independently tested against 200+ contaminants at roughly $0.03 per gallon. Waterdrop's testing documentation focuses primarily on chlorine, taste, odor, and heavy metals, with limited publicly available data for PFAS or pharmaceuticals.
Frequently Asked Questions: Berkey vs. Waterdrop
Is Waterdrop as good as Berkey?
Waterdrop and Berkey both offer gravity-fed stainless steel filtration systems sharing NSF/ANSI 42 and 372 certifications. Waterdrop has a faster flow rate and lower upfront price. All new Berkey systems ship with Black Berkey Elements as the standard included filter, which are tested by EPA-accredited and NSF-accredited third-party laboratories against 200+ contaminants, including 9 PFAS compounds all reduced at >99.9%. For buyers who want documented broad-spectrum filtration data, Berkey provides more transparency. For buyers focused on chlorine reduction at a lower cost, Waterdrop is competitive.
Does Waterdrop remove PFAS?
Waterdrop has referenced PFAS reduction on some King Tank product listings, but publicly available lab reports confirming specific PFAS compound results are not currently published on Waterdrop's website. Black Berkey Elements, the standard filter included with all new Berkey systems, have been independently tested against 9 PFAS compounds including PFOA, PFOS, PFNA, PFBS, and PFHxS, all at >99.9% reduction, with PFOA reduced to below 2 ppt. Those reports are available for download at BigBerkey's test results page.
What certifications does the Waterdrop King Tank have?
The Waterdrop King Tank carries NSF/ANSI 42 certification for its carbon filter elements, covering chlorine, taste, and odor reduction. The housing is certified to NSF/ANSI 372 for lead-free material content by IAPMO R&T. The system does not hold NSF/ANSI 53, which would certify performance against health-effects contaminants like lead and VOCs.
How does Berkey's testing compare to Waterdrop?
Both brands carry NSF/ANSI 42 and 372. Black Berkey Elements, the standard filter in all new Berkey systems, are tested by EPA-accredited and NSF-accredited third-party laboratories against 200+ contaminants, with downloadable results publicly available. Waterdrop's certifications cover taste, odor, and materials safety but do not include the same breadth of independently documented contaminant reduction data.
How long do Waterdrop King Tank filters last?
The Waterdrop King Tank's carbon filters are rated for 6,000 gallons per pair, matching the lifespan of Black Berkey Elements, which ship standard with all new Berkey systems. The fluoride add-on filters for both brands are rated for 1,000 gallons per pair, which at typical household usage of approximately 1 gallon per day means annual replacement.
Is Waterdrop affiliated with Berkey?
No. Waterdrop explicitly states it is an independent brand with no affiliation with Berkey. Waterdrop does sell replacement filters marketed as compatible with Berkey systems, but the two companies have no corporate relationship. Berkey systems sold through BigBerkeyWaterFilters.com ship with authentic Black Berkey Elements as the standard included filter.
Which gravity filter has faster flow: Berkey or Waterdrop?
The Waterdrop King Tank filters at approximately 4 gallons per hour, faster than the typical 1.5 to 3 GPH of Berkey systems with Black Berkey Elements installed. For households that refill frequently or want shorter wait times, this is a measurable advantage in Waterdrop's favor.
Which gravity filter is better for long-term use?
Both the Berkey and Waterdrop King Tank use durable stainless steel housings with replaceable filter elements. Berkey's lifetime hardware warranty and 25+ year track record give it a longer documented history. Waterdrop's lower replacement filter cost is a modest long-term cost advantage. The key factor is whether broad-spectrum lab documentation matters: Black Berkey Elements, standard in all new Berkey systems, are tested against 200+ contaminants with publicly available reports, which Waterdrop does not currently match.
Our Verdict
Waterdrop is a legitimate option for buyers whose primary goal is chlorine, taste, and odor reduction at a lower price with faster flow. It holds NSF/ANSI 42 and 372 certifications and delivers a well-built countertop system. Where Berkey separates itself is documentation depth. All new Berkey systems ship with Black Berkey Elements as the standard filter, which are tested by EPA-accredited and NSF-accredited third-party laboratories against 200+ contaminants, including 9 PFAS compounds all reduced at >99.9% with PFOA brought to below 2 ppt. That level of testing transparency is not matched by Waterdrop's current public documentation. Buyers who want to know precisely what their filter is reducing, backed by published third-party lab data, are better served by Berkey. Buyers with a tighter budget who primarily want improved taste and chlorine reduction will find the Waterdrop King Tank a reasonable choice, but should request full testing documentation before purchasing.
Additional Resources
See Berkey's Full Test Results
Compare independently verified lab data for 200+ contaminants and explore the full system lineup.
By
Dan DeBaun
