Under-Sink Filtration

Under-sink water filtration in San Diego. Better water right at the kitchen tap.

Under-sink filtration puts targeted treatment exactly where you need it: at the kitchen tap and the refrigerator line. For households that already have whole-house filtration for chloramine and hardness, an under-sink system adds a final polishing stage that removes any remaining taste compounds, sediment, or dissolved contaminants before the water reaches your glass. For households without whole-house treatment, an under-sink system is an effective entry point for clean drinking water. The pros we send install multi-stage systems that are matched to what your water actually contains.

Last updated April 23, 2026 · Serving all of San Diego County

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Multi-stage under-sink water filter system installed beneath a San Diego kitchen sink

What's included in under-sink water filtration?

Free in-home water test to identify what needs to be removed at the point of use
Multi-stage filtration: sediment, catalytic carbon, and specialty stages as needed
Dedicated drinking water faucet in brushed nickel, chrome, or oil-rubbed bronze
Refrigerator and ice maker line connection
NSF/ANSI certified filter cartridges for documented contaminant reduction
Compact configurations that fit in most under-sink cabinets
Annual filter replacement service on a schedule we set at install
Upgrades to full reverse osmosis if your water test indicates it is warranted
Stainless steel tank options for filtration vessels

Under-Sink Filtration detail work by a Filter Pros San Diego water treatment technician

When do you need under-sink water filtration?

You want clean drinking and cooking water without filtering the whole house
Your whole-house system handles hardness and chloramine but you want additional polish at the tap
You are renting and cannot install a whole-house system
Your refrigerator filter is not enough for your water quality concerns
You want a step up from a counter-top pitcher without the hassle of refilling it

What do San Diego homeowners ask about under-sink water filtration?

What is the difference between under-sink filtration and reverse osmosis?

Under-sink filtration removes chloramine, taste compounds, sediment, and specific contaminants using carbon and specialty media. Reverse osmosis adds a membrane stage that also removes dissolved solids including sodium, nitrates, heavy metals, and PFAS. RO produces higher purity water but is more expensive and wastes some water. We recommend based on your water test results.

Will I need a new hole drilled for the dedicated faucet?

Most kitchen sinks have an existing knockout hole used for a soap dispenser or vegetable spray that works perfectly for the dedicated faucet. If not, one gets drilled. It is a straightforward step handled during the install.

How often do under-sink filters need to be replaced?

Carbon cartridges typically need replacement every six to twelve months depending on water usage and your feed water quality. We set a reminder schedule at install. Running a filter past its service life reduces effectiveness, so staying on schedule matters.

Can an under-sink filter remove PFAS?

Some can. Certain catalytic carbon and specialty media are certified for PFAS reduction, but not all carbon filters are. If PFAS is a concern based on your water test, we specify NSF/ANSI 58 or 53 certified media rated for PFAS, or recommend an upgrade to reverse osmosis.