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 its PFAS and lead claims are not certified.
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 but not NSF/53 certified for lead. Certification is not a substitute for a water test of your own supply.
Flags
- · Marketed for lead removal but not NSF/53 certified for lead.
- · Marketed for PFAS removal but not certified to NSF/ANSI 53 or 58 for PFOA/PFOS.
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 42 days ago- Cost / gallon
- $0.005
- ~Annual filters
- $6/yr
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 (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 but not NSF/53 certified for lead.
- - Marketed for PFAS removal but not certified to NSF/ANSI 53 or 58 for PFOA/PFOS.
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 but not certified
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 but we found no accredited lead certification. It is marketed for PFAS but we found no accredited PFAS certification.
- 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, not that a product fails to perform. Last reviewed 2026-06-01. Scored under water-v1.0. Prices were last checked 42 days ago; the freshness chip above the cost panel shows the current state. See the methodology for how each rule fires.