Water filter/under-sink
Waterdrop 10UA Under-Sink
An inexpensive high-capacity inline under-sink filter, IAPMO certified to NSF/ANSI 42 and 372, but we found no listing for its PFAS and lead claims as of 2026-06-01.
- Rubric
- water-v1.0
- Confidence
- Verified
Bottom line
In our scoring the Waterdrop 10UA Under-Sink earns 5.7/10, a weak result, and it stands out on total cost of ownership (9.0/10). On the data, it holds IAPMO certification to reduce chlorine taste and odor. It works out to about $0.005 per gallon, very cheap per gallon. Our main catch: marketed for lead removal; we found no NSF/ANSI 53 lead listing as of 2026-06-01. Certification is not a substitute for a water test of your own supply.
Flags
- · Marketed for lead removal; we found no NSF/ANSI 53 lead listing as of 2026-06-01.
- · Marketed for PFAS removal; we found no NSF/ANSI 53 or 58 PFOA/PFOS listing as of 2026-06-01.
Flags indicate missing certifications or data gaps under our rubric, not a confirmed finding that a product fails to perform.
Where to buy
No buy link on this one: it scored Limited under our rubric, and we only link products we would shortlist ourselves.
Total cost of ownership
Checked 136 days ago - re-check soon- ~Annual filters
- $6/yr
- Per gallon
- $0.005
Certifications
- NSF/ANSI 42chlorine
- NSF/ANSI 372lead-free materials
Filters only protect you on their swap schedule. Get an email reminder when this one is due - one note around swap time, nothing else.
Overview
The Waterdrop 10UA Under-Sink is a under sink water filter. It is third-party certified (IAPMO) to reduce chlorine taste and odor. It is also marketed for PFAS, PFOA, PFOS, lead, sediment, for which we found no accredited third-party certification as of 2026-06-01 (so we award no certification credit; this is not a finding that it fails to reduce them). Running cost works out to about $0.005 per gallon.
By the numbers
- Certified to reduce
- chlorine taste and odor
- Marketed, no certification found
- PFAS, PFOA, PFOS, lead, sediment
- Format
- under sink
- Cartridge life
- 8,000 gallons
- Cost per gallon
- $0.005
- Annual filter cost (~1,100 gal)
- $6/yr
- Flow rate
- 0.75 gpm
- Install
- under-sink inline, push-to-connect, DIY
- Certifications
- IAPMO NSF/ANSI 42; IAPMO NSF/ANSI 372
Strengths
- + Total Cost of Ownership: 9.0/10
- + Certification Independence: 8.0/10
- + Capacity & Flow Fit: 8.0/10
Watch-outs
- - Verified Contaminant Reduction: 1.0/10
- - Marketed for lead removal; we found no NSF/ANSI 53 lead listing as of 2026-06-01.
- - Marketed for PFAS removal; we found no NSF/ANSI 53 or 58 PFOA/PFOS listing as of 2026-06-01.
Who it is for
- · Cost-conscious buyers - very low cost per gallon
Who should skip it
- · Anyone buying specifically for PFAS - it is marketed for it and we found no certification listing as of 2026-06-01
What to know before buying
- · The replacement filter is the WD-RF10, rated up to 8,000 gallons or about 12 months on municipal water, with a twist-and-lock change.
- · Its certification covers NSF/ANSI 42 for chlorine reduction and NSF/ANSI 372 for lead-free materials; the PFAS and lead reduction figures are marketed but not part of that certification.
- · Tested flow is about 0.75 GPM at 60 psi, and it connects directly to the existing kitchen faucet line rather than a separate faucet.
How it scored
Verified Contaminant Reduction
1.0/10 · 35%Held NSF/WQA/IAPMO certifications for the contaminants that matter. A claim is not a certification.
- +1NSF/ANSI 42 certified for chlorine ANSF/42 chlorine - Certified to reduce chlorine taste and odor.
Total Cost of Ownership
9.0/10 · 25%Computed cost per gallon vs the format-class median. The number nobody surfaces.
- +8Cost per gallon vs class median A$0.005/gal (bottom 20% of class (cheapest to run)) - Computed cost per gallon scored against the format-class median.
- +1No proprietary cartridge lock-in Bcross-compatible cartridges - Cartridges are sold separately with cross-compatible equivalents.
Certification Independence
8.0/10 · 15%Certified on the official database vs self-claimed 'tested to' marketing.
- +5Certifications verifiable on official database A2 listings - Certifications are listed on the official NSF/WQA/IAPMO database, not just a logo.
- +3Per-contaminant reduction disclosed Bperformance data sheet - Publishes percent reduction per contaminant at rated capacity.
- ·Marketing exceeds certified scope Aclaims beyond certified scope - Marketing emphasizes contaminants the certifications do not cover.
Capacity & Flow Fit
8.0/10 · 15%Cartridge life and flow appropriate to the format.
- +3Cartridge life fits the format B8000 gal (norm 500) - Rated cartridge life is appropriate for this filter format.
- +3Flow / storage disclosed and adequate B0.75 gpm - Flow rate or RO storage is disclosed and adequate for the format.
- +2Honestly rated filter life Bgallon rating matches typical use - Months claim matches the gallon rating at typical use.
Practical Fit
7.0/10 · 10%Install, footprint, and source-water readiness.
- +5Install type disclosed Cunder-sink inline, push-to-connect, DIY - Install method and difficulty are disclosed up front.
- +2Predictable replacement schedule Chonest life rating - Replacement schedule is predictable from the honest gallon rating.
FAQ
- Is the Waterdrop 10UA Under-Sink NSF certified, and does it remove lead or PFAS?
- Per the public NSF/WQA/IAPMO databases it holds IAPMO certification to reduce chlorine taste and odor. It is marketed for lead; we found no accredited lead certification as of 2026-06-01. It is marketed for PFAS; we found no accredited PFAS certification as of 2026-06-01.
- Is the Waterdrop 10UA certified to remove PFAS and lead?
- Its certification covers NSF/ANSI 42 (chlorine) and NSF/ANSI 372 (lead-free materials); the PFAS and lead reduction figures are marketing claims not covered by that certification.
- What is the replacement filter and how often?
- It uses the WD-RF10 cartridge, rated up to 8,000 gallons or about 12 months on municipal water, swapped with a quick twist-and-lock motion.
Compared head-to-head
Related guides
This score is our opinion under our published rubric, not a statement of objective fact or a lab test of this product. We score what third-party certifications prove; absence of a certification means we found no verification as of 2026-06-01, not that a product fails to perform. Last reviewed 2026-06-01. Scored under water-v1.0. Prices were last checked 136 days ago; the freshness chip above the cost panel shows the current state. See the methodology for how each rule fires.