Membrane protection first
Peninsula water carries chloramine, which wears down RO membranes. We always put catalytic carbon ahead of the membrane so it lasts as it should.
Multi-stage drinking water
Reverse Osmosis Systems in San Mateo
Low-TDS drinking water from a dedicated faucet, fitted under your kitchen sink. We put in RO systems across San Mateo, from homes near Hillsdale Boulevard to the older blocks closer to downtown.
Why San Mateo Kitchens Choose RO
San Mateo Water Filtration fits reverse osmosis systems in San Mateo for people who want the cleanest practical drinking water from the tap. The Cal Water supply is good to start with, but chloramine gives it a taste, and houses built before 1986 may have lead solder in the lines.
RO pushes water through a fine membrane after sediment and carbon stages, so dissolved solids and many contaminants stay behind. The visit is one appointment: we take a reading, mount the system under the sink, and show you the numbers after.
Inside an RO Install
A good RO system is more than a membrane. Each stage has a job to do.
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Baseline reading at the tap
We measure TDS and chloramine at the kitchen faucet. That number is the baseline we compare against later.
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Sediment stage
A sediment cartridge catches rust and grit first. Older galvanized lines in neighborhoods like Beresford and Sunnybrae make this stage earn its keep.
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Catalytic carbon pre-filter
Chloramine damages thin-film RO membranes over time. A catalytic carbon stage ahead of the membrane removes it and protects the part that matters most.
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RO membrane
The membrane reduces dissolved solids, many metals including lead, and a long list of other contaminants. It is the heart of the system.
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Storage tank
A pressurized tank holds a ready supply so the faucet flows at a usable rate. It sits beside the unit in the cabinet.
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Polishing post-filter
A final carbon stage cleans up taste as water leaves the tank. Some households add a remineralization stage for a rounder taste.
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Dedicated faucet
We mount a separate drinking-water faucet on the sink deck or countertop. If there is no spare hole, we drill one cleanly.
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Drain saddle and air gap
Reject water goes to the drain through a proper saddle connection. Every joint is checked before we close the cabinet.
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Fridge or ice-maker line
If you want RO water at the fridge, we can run a line to it. We plan the route so the tubing stays out of sight.
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Cartridge schedule
You get a written schedule for the pre-filters and the membrane. Most changes are simple twist-off swaps.
Three Steps to RO at the Sink
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Reading and cabinet check
We take a TDS and chloramine reading at the kitchen faucet. Then we check cabinet space, the drain, and where the new faucet will go. You get a written quote before anything is fitted. Expect around twenty minutes.
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Under-sink install
We mount the stages and tank, tap into the cold line and drain, and fit the faucet. You will see a neat row of cartridges and a small tank in the cabinet. The tank fills slowly the first time, so we flush the system while we finish up. Plan on one visit of a couple of hours.
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Second reading
Once the tank fills, we take another TDS reading at the new faucet. You see the drop side by side with the first number. We show you where each cartridge sits and how to change it.
Why Choose San Mateo Water Filtration for Reverse Osmosis Systems
Readings you can see
The TDS meter comes out before and after. You'll know what's in the glass instead of taking our word for it.
Tidy cabinet work
Lines are cut to length and clipped, not left in loops. You still have room under the sink for the trash bin and the cleaning spray.
- Flat-rate written quoteEquipment listed line by line
- TDS readings at the tapBefore and after the install
- One-visit installBooked at a time that suits you
- NSF/ANSI 58 equipmentReverse osmosis standard
Put Clean Drinking Water at the Sink
One appointment gets you a reading, a written quote, and a working RO faucet. Pick a time that suits your week, and we show up when we said we would.