Under Sink Water Filtration Systems

Under Sink

Some of the most popular systems are under sink water filters that feature a small separate faucet from which you can dispense clean, purified water. This is ideal for homes where countertop space is scarce, sleek appearances are a must, and convenience is key. Keep in mind that an under sink water filter is a bit harder to install since they connect to the undersink plumbing rather than directly to your faucet. Be prepared to work with minor hose adjustments and connections.


An under sink water filter has its own separate faucet and requires a separate hole near your sink. Many sinks already have this extra hole, usually occupied by an in-sink soap dispenser or spray nozzle, so there's no extra drilling required. Other sinks, however, will require you to drill an extra hole in your countertop before installing the filter. If you do need to drill a hole, carefully consider the type of material your counter is made of so you do not accidentally crack it.

    • Watts WQCFU-T-11 3-Stage Kwik Change Ultrafiltration Water Filter System
    • Watts WQCFU-T-11 3-Stage Kwik Change Ultrafiltration Water Filter System

      Part Number: WQCFU-T-11KIT
      • 11" filter cartridges
      • Low cost alternative to reverse osmosis with ultrafiltration technology
      • No holding tank or waste water
      • Separate, stylish faucet leaves clean countertop
      • Sanitary quick change filters make filter changes a snap
      • Installs in as little as 20 min by a novice
    • 3M Aqua-Pure AP-DWS1000 Drinking Water Filter System
    • 3M Aqua-Pure AP-DWS1000 Drinking Water Filter System

      Part Number: 5583101
      • Filter capacity: 625 gallons or 12 months
      • Reduces cysts, lead, VOC, MTBE, chlorine, taste and odor
      • Filters chlorine, lead, cysts, VOCs
      • Sanitary quick change filter cartridges for fast and easy filter changes
      • Tested and certified by NSF International to NSF/ANSI Standard 42 and 53
    • Watts WQCFU-T-13 3-Stage Kwik Change Ultrafiltration Water Filter System
    • Watts WQCFU-T-13 3-Stage Kwik Change Ultrafiltration Water Filter System

      Part Number: WQCFU-T-13KIT
      • 13" filter cartridges
      • Low cost alternative to reverse osmosis with ultrafiltration technology
      • No holding tank or waste water
      • Separate, stylish faucet leaves clean countertop
      • Sanitary quick change filters make filter changes a snap
      • Installs in as little as 20 min by a novice
    • 3M Water Factory Systems FaucetMATE FM-2 CTO Drinking Water System
    • 3M Water Factory Systems FaucetMATE FM-2 CTO Drinking Water System

      Part Number: 05-460010
      • A low cost alternative to reverse osmosis
      • Reduces chlorine, taste and odor
      • Filter Capacity: 2500 gallons
      • 10 year warranty
      • Easy to install
      • NSF certified
    • 3M Water Factory Systems FaucetMATE FM-2 Lead Plus Drinking Water System
    • 3M Water Factory Systems FaucetMATE FM-2 Lead Plus Drinking Water System

      Part Number: 05-460013
      • A low cost alternative to reverse osmosis
      • Filters sediment down to 0.5 microns
      • Reduces chlorine, taste and odor
      • Reduces lead and cysts
      • Filter capacity: 500 gallons
      • 10 year manufacturer's warranty
      • NSF certified
    • 3M Water Factory Systems FaucetMATE FM-350 DWS Drinking Water System
    • 3M Water Factory Systems FaucetMATE FM-350 DWS Drinking Water System

      Part Number: 05-460014
      • A low cost alternative to reverse osmosis
      • Filters sediment down to 0.5 microns
      • Reduces chlorine, taste and odor
      • Reduces cysts, lead, THMs, VOCs and MTBE
      • Filter capacity: 350 gallons
      • 10 year manufacturer's warranty
      • NSF certified
    • Watts WQT4RO11-50PT QT Quick Twist Reverse Osmosis Drinking Water System 50 gpd
    • Watts WQT4RO11-50PT QT Quick Twist Reverse Osmosis Drinking Water System 50 gpd

      Part Number: WQT4RO11-50PT
      • Quick change technology makes filter changes far faster than traditional sump systems! Filters are quick and easy to change with just a twist
      • Flow shuts off when cartridges are removed
      • Standard chrome air gap faucet
      • Assembled in the USA
      • Space-saving plastic holding tank
    • Watts WQC4RO11-50 Kwik Change Reverse Osmosis System 50 gpd
    • Watts WQC4RO11-50 Kwik Change Reverse Osmosis System 50 gpd

      Part Number: WQC4RO11-50MT
      • Quick change RO systems significantly reduce filter change time! Change filters with a single 1/4 turn twist! Much quicker than traditional sump systems.
      • Quickly compare all Watts Quick Change Reverse Osmosis Systems
      • 4.4 gal heavy-duty steel tank
      • Simple to install (see our videos)
      • 11'' Filters provide up to 50 gal of RO filtered water per day (serves up to 4 people).
      • This system is independently CERTIFIED by the WQA so you know you can trust it.
      • Replacement Filters do not fit the Watts Premier RO-PURE RO-4 Reverse Osmosis System
    • Watts WQC4RO13 Kwik-Change Reverse Osmosis System 100 gpd
    • Watts WQC4RO13 Kwik-Change Reverse Osmosis System 100 gpd

      Part Number: WQC4RO13-100MT
      • Quick change RO systems significantly reduce filter change time! Change filters with a single 1/4 turn twist! Much quicker than traditional sump systems.
      • Quickly compare all Watts Quick Change Reverse Osmosis Systems
      • 4.4 gal heavy-duty steel tank
      • Simple to install (see our videos)
      • 13'' Filters provide up to 100 gal of RO filtered water per day.
      • This system is independently CERTIFIED by the WQA so you know you can trust it.
      • Replacement filters do not fit the Watts Premier RO-PURE RO-4 Reverse Osmosis System
    • 3M Water Factory Systems SQC PRO Reverse Osmosis System With Pump
    • 3M Water Factory Systems SQC PRO Reverse Osmosis System With Pump

      Part Number: 04-08201
      • Great for areas with low water pressure like wells
      • Consistently provides a good stream of water with high demand
      • Sanitary quick change filters make filter changes a snap
      • 10 year manufacturer's warranty
    • 3M Water Factory Systems 04-045 SQC-3-HF Reverse Osmosis System
    • 3M Water Factory Systems 04-045 SQC-3-HF Reverse Osmosis System

      Part Number: 04-045
      • Sanitary quick change system eliminates the need to handle the filter media
      • Easy to change 1/4 turn filters
      • 10 year limited manufacturer's warranty
      • NSF certified
      • Self cleansing for RO membrane
      • Powered by water line pressure, no electricity required
      • Effectively removes arsenic (pentavalent), fluoride, barium, lead, cadmium, radium 226/228, hexavalent chromium, selenium, trivalent chromium, TDS (Total Dissolved Solids), copper, turbidity, cysts, chlorine, taste and odor
    • Watts Premier 531411 RO-PURE RO-4 Reverse Osmosis System 50 gpd
    • Watts Premier 531411 RO-PURE RO-4 Reverse Osmosis System 50 gpd

      Part Number: 531411
      • Quick change RO systems significantly reduce filter change time! Much quicker than traditional sump systems.
      • Quickly compare all Watts Quick Change Reverse Osmosis Systems
      • 4.4 gal heavy-duty steel tank
      • Simple to install (see our videos)
      • Provides up to 50 gal of RO filtered water per day (serves up to 4 people).
      • This system is independently CERTIFIED by the WQA so you know you can trust it.
      • Replacement filters do not fit the Watts Kwik-Change reverse osmosis system
    • Culligan IC-EZ-1 EZ-Change Ice Maker and Refrigerator Filter 01019034
    • Culligan IC-EZ-1 EZ-Change Ice Maker and Refrigerator Filter 01019034

      Part Number: IC-EZ-1
      • Tested and certified by NSF International to NSF/ANSI Standard 42
      • Sanitary twist-on and twist-off filter
      • Change the Culligan RC-EZ-1 filter once a year
      • For a more robust system that removes more, buy the Culligan IC-EZ-3 or Culligan IC-EZ-4
      • 2-year limited warranty on housing only
      • The Culligan IC-EZ-1 is compatible with the following replacement filters: Culligan RC-EZ-1, as well as Culligan RC-EZ-3 Culligan RC-EZ-4 for better filtering
    • Culligan US-EZ-1 EZ-Change Under Sink Drinking Water System 01019052
    • Culligan US-EZ-1 EZ-Change Under Sink Drinking Water System 01019052

      Part Number: US-EZ-1
      • Tested and certified by NSF International to NSF/ANSI Standard 42
      • Sanitary twist-on and twist-off filter
      • Change the Culligan RC-EZ-1 filter once a year
      • For a more robust system that removes more, buy the Culligan US-EZ-3 or Culligan US-EZ-4
      • 2-year limited warranty on housing only
      • The Culligan US-EZ-1 is compatible with the following replacement filters: Culligan RC-EZ-1, as well as Culligan RC-EZ-3 & Culligan RC-EZ-4 for better filtering
    • Culligan US-EZ-3 EZ-Change Under Sink Drinking Water System 01019053
    • Culligan US-EZ-3 EZ-Change Under Sink Drinking Water System 01019053

      Part Number: US-EZ-3
      • Tested and certified by NSF International to NSF/ANSI Standard 42 and 53
      • Sanitary twist-on and twist-off filter
      • Change the Culligan RC-EZ-3 filter every 6 months
      • For a more robust system that removes more purchase the Culligan US-EZ-4
      • 2-year limited warranty on housing only
      • The Culligan US-EZ-3 is compatible with the following replacement filters: Culligan RC-EZ-3, as well as Culligan RC-EZ-4 for better filtering
    • Culligan US-EZ-4 EZ-Change Under Sink Drinking Water System 01019054
    • Culligan US-EZ-4 EZ-Change Under Sink Drinking Water System 01019054

      Part Number: US-EZ-4
      • The highest filtration level of the Culligan under sink water filters
      • Tested and certified by NSF International to NSF/ANSI Standard 42 and Standard 53
      • Sanitary twist-on and twist-off filter
      • Change Culligan RC-EZ-4 filter every 6 months
      • 2-year limited warranty on housing only
      • The Culligan US-EZ-4 is compatible with the following replacement filters: Culligan RC-EZ-4
    • Watts Premier 531130 Filter-Pure UF3 Ultrafiltration Water Filter System
    • Watts Premier 531130 Filter-Pure UF3 Ultrafiltration Water Filter System

      Part Number: 531130
      • Simple and sanitary quick filter changes with filter head on a swivel to accommodate easy access
      • Works great in low water pressure situations
      • Tested and certified by WQA to NSF/ANSI Standards 42 and 53
      • Filtering down to .2 microns!
      • This is NOT the same system as the Watts 3-Stage Kwik Change 11'' Undersink Water Filter System and the filters are NOT interchangeable.
    • Culligan IC-EZ-3 EZ-Change Ice Maker Refrigerator Filter 01019035
    • Culligan IC-EZ-3 EZ-Change Ice Maker Refrigerator Filter 01019035

      Part Number: IC-EZ-3
      • Tested and certified by NSF International to NSF/ANSI Standard 42
      • Sanitary twist-on and twist-off filter
      • Change the Culligan RC-EZ-3 filter every 6 months
      • For a more robust icemaker filter, purchase the Culligan IC-EZ-4
      • 2-year limited warranty on housing only
      • The Culligan IC-EZ-3 is compatible with the following replacement filters:  RC-EZ-3 as well as RC-EZ-4 for a better filtration level
    • Culligan IC-EZ-4 EZ-Change Ice Maker and Refrigerator Filter 01019036
    • Culligan IC-EZ-4 EZ-Change Ice Maker and Refrigerator Filter 01019036

      Part Number: IC-EZ-4
      • Tested and certified by NSF International to NSF/ANSI Standard 42
      • Sanitary twist-on and twist-off filter
      • Change the Culligan RC-EZ-4 filter every 6 months
      • 2-year limited warranty on housing only
      • The Culligan IC-EZ-4 is compatible with the Culligan RC-EZ-4 replacement filter
    • GE GXRLQ Inline Water Filtration System
    • GE GXRLQ Inline Water Filtration System

      Part Number: GXRLQ
      • Filter Capacity: 750 gallons or 6 months
      • Flow Rate: 0.5 gpm
      • Reduces 99.99% of cysts
      • Reduces 99.3% of lead
      • Also reduces, asbestos, lindane, atrazine, mercury, chlorine, taste and odor
      • Tested and Certified by NSF International to NSF/ANSI Standard 42 and 53
    • Watts GTS-550 Five Stage Reverse Osmosis System 50 gpd
    • Watts GTS-550 Five Stage Reverse Osmosis System 50 gpd

      Part Number: GTS-550S-MT
      • 5-stage system filters down to .0001 microns
      • Stage 1: 5 micron Sediment Filter
      • Stage 2: 5 micron Carbon Block Filter
      • Stage 3: 5 micron Carbon Block Filter
      • Stage 4: 50 GPD RO Membrane
      • Stage 5: Inline GAC Postfilter
      • 1-year limited warranty
    • Neo-Pure TL3 Ultrafiltration Drinking Water System
    • Neo-Pure TL3 Ultrafiltration Drinking Water System

      Part Number: TL3-KIT
      • Hollow fiber ultrafiltration membrane filters down to 0.025 micron
      • Flows at twice the rate of comparable UF systems
      • Great choice for applications with multiple points of use
      • Easier to install than reverse osmosis; requires no tank or drain
      • 1/4 turn quick change filters
      • Shut off valves built into heads allow you to replace filters without turning off the water
      • Reduces chlorine taste and odor
      • Removes 99.99% of cysts (such as cryptosporidium and giardia)
      • Removes 99.9999% of bacteria and 99.99% of viruses
      • Reduces lead, lindane and atrazine
      • Reduces VOC and MTBE
    • 3M Aqua-Pure AP200 Drinking Water Filtration System
    • 3M Aqua-Pure AP200 Drinking Water Filtration System

      Part Number: 55289-01
      • Reduces sediment, chlorine, taste and odor
      • Inlet/Outlet Connections: 3/8" FNPT
      • Flow Rate: 2.0 gpm
      • Includes: AP217 cartridge and mounting bracket
    • Pura UV 15520100 Addon-1 Stainless Steel UV 1 gpm 115 Volt
    • Pura UV 15520100 Addon-1 Stainless Steel UV 1 gpm 115 Volt

      Part Number: 15520100
      • Easy installation and lamp replacement
      • Disinfection kill rate: > 99.9% 
      • Flow Rate: 1 gpm
      • Molded head with 3/8" quick connect fittings on inlet/outlet
      • 304 grade stainless steel body
    • Pentek RO-2550 4 Stage Reverse Osmosis System 50 gpd
    • Pentek RO-2550 4 Stage Reverse Osmosis System 50 gpd

      Part Number: 161079
      • Under sink residential RO system
      • Permeate Flow Rate: 36 gpd
      • Includes chrome air gap faucet
      • Storage Tank: 2 gallon
      • One year warranty
    • Pentek RO-2550 4 Stage Reverse Osmosis System With Permeate Pump 50 gpd
    • Pentek RO-2550 4 Stage Reverse Osmosis System With Permeate Pump 50 gpd

      Part Number: 161079-ERP
      • Includes a permeate pump for improved performance
      • Under sink residential RO system
      • Permeate Flow Rate: 50 gpd
      • Includes chrome air gap faucet
      • Storage Tank: 2.8 gallon
      • One year warranty
    • Hydrotech 1240 Pro Series Reverse Osmosis System 25 gpd
    • Hydrotech 1240 Pro Series Reverse Osmosis System 25 gpd

      Part Number: 1240301-00
      • Filtration Capacity: 25 gpd
      • Smartap checks water quality at the push of a button
      • Uses quick connect fittings
      • 3/8" tubing to RO tank and faucet for better flow
      • Integrated mounting bracket
      • Color coded tubing for easy installation
    • Neo-Pure K-NPHWD Quick Change Hot Water Dispenser Filter System
    • Neo-Pure K-NPHWD Quick Change Hot Water Dispenser Filter System

      Part Number: K-NPHWD
      • Reduces cysts, lead and scale
      • Reduces sediment, chlorine taste and odor
      • Filter Media: coconut shell carbon block
      • Micron Rating: 1 micron
      • Filter Life: 1250 gallons or 1 year
      • For use with hot water dispenser systems
    • Neo-Pure K-NPQ1 Quick Change Water Cooler Filter System
    • Neo-Pure K-NPQ1 Quick Change Water Cooler Filter System

      Part Number: K-NPQ1
      • For use with water coolers providing cold/room temperature water
      • Reduces cysts and lead
      • Reduces chlorine, taste and odor
      • Micron Rating: 1 micron
      • Filter Life: 1250 gallons
      • Flow Rate: 0.5 gpm
    • Neo-Pure K-NPQ1-S Quick Change Water Cooler Filter System With Scale Inhibitor
    • Neo-Pure K-NPQ1-S Quick Change Water Cooler Filter System With Scale Inhibitor

      Part Number: K-NPQ1-S
      • For use with water coolers providing hot/cold water
      • Reduces cysts, lead and scale
      • Reduces chlorine, taste and odor
      • Micron Rating: 1 micron
      • Filter Life: 1250 gallons
      • Flow Rate: 0.5 gpm
    • Neo-Pure K-NPQ2 2 Stage Quick Change Water Cooler Filter System
    • Neo-Pure K-NPQ2 2 Stage Quick Change Water Cooler Filter System

      Part Number: K-NPQ2
      • For use with water coolers providing cold/room temperature water
      • Reduces cysts and lead
      • Reduces sediment, chlorine, taste and odor
      • Micron Rating: 1 micron
      • Filter Life: 1250 gallons
      • Flow Rate: 0.5 gpm
    • Neo-Pure KNPQ2-S 2 Stage Quick Change Water Cooler Filter System With Scale Inhibitor
    • Neo-Pure KNPQ2-S 2 Stage Quick Change Water Cooler Filter System With Scale Inhibitor

      Part Number: K-NPQ2-S
      • For use with water coolers providing hot/cold water
      • Reduces cysts, lead and scale
      • Reduces chlorine, taste and odor
      • Micron Rating: 1 micron
      • Filter Life: 1250 gallons
      • Flow Rate: 0.5 gpm
    • Neo-Pure K-NPDWSC Quick Change Drinking Water System
    • Neo-Pure K-NPDWSC Quick Change Drinking Water System

      Part Number: K-NPDWSC
    • Pura 1340302 QCRO 4 Stage Quick Change RO System 50 gpd
    • Pura 1340302 QCRO 4 Stage Quick Change RO System 50 gpd

      Part Number: 1340302-60
      • Includes standard air gap faucet
      • Quick change filters for fast, easy maintenance
      • Quick connect fittings
      • Color coded tubing makes installation easier
      • Interchangeable filters available to customize the system to local water conditions
      • Produces high quality water for better tasting coffee, tea, juices, soups, sauces and pasta and clearer ice cubes
      • Tested and Certified by WQA to NSF/ANSI Standard 58
    • AquaCera EcoFast Quick Change Water Filter System and Install Kit
    • AquaCera EcoFast Quick Change Water Filter System and Install Kit

      Part Number: W9332413-KIT
      • AquaCera multimedia (PAC) filter element included
      • Chlorine, particulate, cysts and lead are reduced
      • Flow rate 0.6 gpm
      • Micron Rating: 0.5µm - 0.9µm 
      • Filter Capacity: 1000 gallons
    • Oasis R1P ProSelect Remote Water Chiller 1 gph
    • Oasis R1P ProSelect Remote Water Chiller 1 gph

      Part Number: 503802
      • Designed to install under the sink
      • Produces up to 1 gph of chilled water
      • Certified to NSF/ANSI Standard 61 Annex G (Lead-Free)
      • 1 year limited warranty

More About Undersink Home Water Filtration Systems

If you've done your homework and are set on a hidden, under sink water filter, congratulations! The under sink water filter separate faucet is sleek and low-profile and gives you instant access to freshly filtered water at any time. And an under sink water filter is more effective at removing water contaminants than countertop or pitcher water filters, too.

The under sink water filter is easy to replace, too. Since an under sink water filter is mounted under the sink, they're easy to access. And, with the eFilterWater.com replacement under sink water filter program, your under sink water filters are delivered to your door at the manufacturer's recommended interval, making the entire process even easier!