Our under-sink filter pick for city water
Aquasana Claryum 3-Stage Max Flow
Three-stage carbon filter with its own faucet, tested for lead and PFOA/PFOS
$449.99
Compare with this one →Under sink filter
WaterdropWD-10UA
Under-sink direct-connect filter for chlorine taste, with no drain or power
Source-based analysis, not hands-on testing. Our method
Cofounder of Superhuman Chambers · About the author.
The verdict
The WD-10UA is a small under-sink cartridge that feeds your existing kitchen faucet, with no power or wastewater. It suits city water that tastes of chlorine, and filters cost $30.99 a year. The catch is that the only certified reduction found is chlorine, taste and odor, and NSF doesn't list it.
The trade-off
There's no certified lead or PFAS reduction, and Waterdrop's own capacity figures conflict.
Model reviewed: WD-10UA direct-connect filtration system
$58.99
Check price at Waterdrop US price, checked
No affiliate commission on this link. Check the exact variant before buying.
About this price
List price for SKU WD-10UA (the 11,000-gallon version) on Waterdrop's online store on Oct 13, 2026, with no markdown and shown as available. The product page shows $39.99 next to $58.99, with a "Hot Sale" badge and a "$19 Off" tag. That price needs code WDUA at checkout, so it isn't recorded here. Waterdrop's comparison page still lists the WD-10UA at $51.99. The WD-10UA is still sold, beside the larger WD-15UA at $76.99 and WD-17UA at $95.99. Before tax, and economy shipping is free.
A GOOD FIT FOR
You're on city water and want better-tasting water from your own faucet for about $31 a year in filters.
- City water where chlorine taste or smell is the main complaint
- You want filtered water from your existing faucet without drilling a second hole
- A cramped sink cabinet, since the housing is about 3.9 by 3.6 by 12.3 in
- You want running costs near $31 a year
THINK TWICE IF
- You need certified lead, PFAS or cyst reduction, which no listing found for it covers
- Well water, unless a whole-house filter comes first
- You want lower TDS, which Waterdrop says it isn't meant to remove in any significant amount
- Hot-water lines or outdoor installs
- You'd rather keep dish-rinsing water off the cartridge, which needs a model with its own faucet
What still needs checking
- Whether IAPMO's own listing matches the third-party record, since its certificate pages couldn't be opened
- Whether WQA lists it, since its directory couldn't be searched
- Which capacity is right: 11,000 or 8,000 gallons
- Test conditions behind the 0.75 GPM and 2.0 gpm figures
- Test results behind the heavy-metal and mercury claims
- Whether you need a plumber, and whether the shared parts list all ships with the WD-10UA
- Whether an installed, used unit counts as like new for a return
The practical details.
| Exact variant | WD-10UA direct-connect filtration system |
|---|---|
| Filter life | 12 months or 11,000 gallons on the spec table; 8,000 gallons in other Waterdrop listings |
| Flow rate | 0.75 GPM on the spec table; the FAQ cites 2.0 gpm full flow at 60 psi |
| Certification | Not in NSF's database; a third-party database points to IAPMO R&T for NSF/ANSI 42 (chlorine, taste and odor) and NSF/ANSI/CAN 372 |
| Filter media | Polyester membrane, carbon block and KDF; 0.5 micron |
| Operating limits | 10–125 psi; 35–100°F; cold water only; indoor use |
| Faucet and power | Feeds your existing faucet; no electricity and no wastewater |
| Dimensions | 3.9 × 3.6 × 12.3 in, per the spec table. Waterdrop's comparison page gives 3.6 × 3.85 × 12.3 in and a weight of 3.30 lb. |
| Materials | One cartridge with a polyester membrane, an activated carbon block and KDF media, rated at 0.5 micron, per the store description. Waterdrop's FAQ calls this five-stage filtration. The product page says the materials are lead-free and BPA-free. |
Before you buy
InstallationIt connects to the cold-water line under the sink and feeds your existing faucet…
It connects to the cold-water line under the sink and feeds your existing faucet, so there's no extra hole to drill. Waterdrop's store description says it fits faucets with 1/2 in or 3/8 in female NPT threads. Setup uses push-to-connect fittings and a twist-and-lock design. The FAQ gives two steps: fix the filter head and filter, then connect the cold supply. Waterdrop recommends 10 to 125 psi feed pressure and gives an operating range of 35 to 100°F. The spec table says indoor use only, and on well water you need a whole-house filter first. The parts list names the filter system, inlet and outlet hoses, a 3/8 to 1/2 in converter set, self-tapping screws, Teflon tape and a drilling sticker. That list isn't split by model. The FAQ says a user manual is on the product page, but neither the page nor the help center links one for this model. Waterdrop sells fridge connection kits if you want to run it to a refrigerator or ice maker.
WarrantyThe product page gives a one-year warranty covering manufacturing defects
The product page gives a one-year warranty covering manufacturing defects. It also promises lifetime technical support but gives no terms for it. Waterdrop's service policy spells out warranty terms only for its RO systems and says coverage varies by model. For a quality defect during the warranty period, Waterdrop says it can take a free return, repair the unit or send a replacement. Breakage and misuse aren't covered. Its extended-warranty terms apply only to purchases on its US site and exclude filters. They also rule out damage from well water and list 14.5 to 87 psi and 41°F to 100°F as operating conditions. That pressure range is narrower than the 10 to 125 psi on the product page.
ReturnsYou get 30 days from receipt, for orders within the continental US
You get 30 days from receipt, for orders within the continental US. Items must be disassembled and repacked in the original packaging. There's no restocking fee within 30 days, but you pay return shipping unless the problem is a quality defect. A return that isn't in like-new condition carries a 10% restocking fee. After 30 days, the fee is 10% for everything and shipping comes out of the refund. Refunds are processed within 5 working days of inspection. Orders from third-party sellers, including Amazon, don't qualify. If the price drops within 30 days on an order shipped and sold by waterdropfilter.com, Waterdrop refunds the difference.
More about this assessment
The WD-10UA is a single cartridge that sits under the sink and feeds your existing kitchen faucet. Waterdrop rates it at 0.75 GPM and says it needs no electricity and makes no wastewater. NSF's database doesn't list it, but a third-party database ties it to IAPMO listings for chlorine, taste and odor reduction and for lead-free parts. Waterdrop's heavy-metal claims come with no test data. Its pages also disagree on cartridge life, giving 11,000 or 8,000 gallons over 12 months. The list price is $58.99. With one $30.99 cartridge a year, three years costs about $152 before installation. It suits chlorinated city water, not lead, PFAS or well-water problems.
Strengths on paper
- Feeds your existing faucet, so there's no extra hole or second tap
- No electricity, and no wastewater to drain
- $58.99 list price and a $30.99 yearly cartridge, about $152 over three years
- Small housing at about 3.9 × 3.6 × 12.3 in
- Takes feed pressure from 10 to 125 psi
- One cartridge change a year at the 12-month rating
Limitations
- The only certified reduction found is chlorine, taste and odor, and it rests on a third-party database
- NSF's database doesn't list it, though Waterdrop's NSF page credits NSF International
- Heavy-metal and mercury claims come with no lab, standard or percentage
- Waterdrop's own pages disagree on capacity: 11,000 or 8,000 gallons
- All cold water at the faucet runs through the cartridge, including water for dishes
- One-year warranty, and the service policy gives no specific terms for under-sink filters
- No user manual linked on the product page or in the help center
- Waterdrop's comparison page shows a $51.99 price and $24.99 yearly cost that don't match the store
What it costs to own.
Adjust the assumptions for your use. Missing costs stay unknown.
PLAN YOUR OWNERSHIP COSTS
What will it cost to own?
Change the assumptions to fit your use. Leave an unknown cost blank. Add water, subscriptions, cleaning, shipping and taxes if they apply. Use average operating power, not the maximum rating.
3-year known subtotal
$151.96Incomplete: installation. This is not the full ownership cost.
Energy component: $0.00
Purchase + installation + years × (annual consumables + annual other) + watts/1000 × hours/day × 365 × years × $/kWh. Annualized allowances, not an exact replacement schedule. Excludes taxes, shipping, finance and resale unless entered.Replacement parts & cost assumptions
Recorded recurring parts and refills:
- WD-RF10 replacement filter: $30.99 every 12 months. Rated for 12 months. The variant title says 11,000 gallons, while the description says 8,000 gallons and about 22 gallons a day. Waterdrop says actual life depends on local water quality. The same cartridge fits the UA, UB and UC series.
- Purchase is the $58.99 list price on Waterdrop's online store on Oct 13, 2026, before tax. The product page also shows $39.99 with code WDUA at checkout, a one-time $19 saving.
- Filters are one $30.99 WD-RF10 a year at the 12-month rating.
- The gallon ratings work out to about 22 to 30 gallons a day. All the cold water from your faucet counts, including dish rinsing, so heavy use means earlier changes.
- Installation is unknown. Waterdrop describes a push-to-connect, twist-and-lock setup but doesn't say whether you need a plumber.
- Energy is zero. Waterdrop says it works without electricity and makes no wastewater.
- Nothing on the product page requires a subscription, so other yearly costs are $0.
- Three years at list prices comes to $58.99 + 3 × $30.99 = $151.96, before installation.
- Waterdrop's comparison page still shows $51.99 and a $24.99 average annual cost, which don't match today's store prices.
Evidence & sources.
Do water filters work? Our evidence review grades the research as Strong. That grade is about the claim, not about this product.
- CertificationNSF's drinking water treatment database lists no WD-10UA or WD-RF10. A trade-name search for 10UA returned "No Matching Products Found". The Waterdrop listings that could be read, from Qingdao Ecopure Filter Co., cover refrigerator, faucet-mount, pour-through and plumbed-in filters under NSF/ANSI 42, 53 and 401, with no UA or RF10 model.78 Checked on Oct 13, 2026. This rules out NSF as the certifier, not certification by another body.
- Manufacturer claimWaterdrop's product page and spec table say the system is certified to NSF/ANSI 42 and 372, for lead-free, BPA-free materials. Waterdrop's NSF page says its filters are tested and certified by NSF International and lists the Direct Connect system under NSF/ANSI 42 and 372.157 Neither page names a listing or certificate number, and NSF's own database doesn't list the model. NSF/ANSI 42 covers aesthetic claims such as chlorine, taste and odor, not health contaminants.
- Independent testA third-party filter database reports IAPMO R&T listings for the WD-10UA with the WD-RF10 cartridge: file W-11590 under NSF/ANSI 42-2022 and file W-13936 under NSF/ANSI/CAN 372-2022. It gives chlorine, taste and odor as the only certified reduction claim and found no NSF or WQA listing, as of Sep 3, 2026.9 IAPMO's certificate pages block automated access, so the listing wasn't confirmed with IAPMO directly. Treat this as a pointer, not a substitute for the listing. NSF/ANSI 372 covers the lead content of parts that touch water, not what the filter removes.
- Manufacturer claimWaterdrop says the WD-10UA reduces chlorine, odor, sediment and heavy metals, third-party tested. Its FAQ adds mercury and other chemical contaminants, and says the filter isn't meant for significant TDS removal.12 Waterdrop names no lab, test standard, challenge level or percentage. No certification found for this model covers heavy metals, mercury, lead or PFAS.
- Manufacturer claimWaterdrop rates the WD-RF10 cartridge at 12 months and 11,000 gallons on the product page and in variant titles. Its store description, replacement-filter description and comparison page give 8,000 gallons. Flow is 0.75 GPM in the spec table and 2.0 gpm at 60 psi in the FAQ.136 Waterdrop doesn't explain either gap or give test conditions for the flow figures.
Sources (10)
- Under Sink Water Filter | Direct Connect Filtration System (WD-10UA) Waterdrop · manufacturer · checked Oct 13, 2026
- Direct Connect Filtration System store listing (variants, prices, description) Waterdrop · manufacturer · data file · checked Oct 13, 2026
- Replacement Undersink Water Filter WD-RF10, WD-RF15, WD-RF17 store listing Waterdrop · manufacturer · data file · checked Oct 13, 2026
- Service Policy (returns, warranty, price match and shipping) Waterdrop · manufacturer · checked Oct 13, 2026
- NSF Certification Waterdrop · manufacturer · checked Oct 13, 2026
- Single-stage Under Sink Water Filter Comparison Waterdrop · manufacturer · checked Oct 13, 2026
- NSF listings: drinking water treatment units, trade name Waterdrop NSF · certifier · checked Oct 13, 2026
- NSF listings: drinking water treatment units, trade name 10UA NSF · certifier · checked Oct 13, 2026
- Waterdrop 10UA certification record TapWaterData · independent test · checked Oct 13, 2026
- Help Center Waterdrop · manufacturer · checked Oct 13, 2026
Other options.
Back to our water filtration picks →About this review. The facts on this page come from manufacturer pages, certification listings and independent tests, checked Oct 13, 2026. The sources are listed above.
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