Reverse Osmosis

Reverse osmosis systems in San Diego. Bottled-quality water, at your tap.

A reverse osmosis system is a water filter that sits under the kitchen sink and feeds its own drinking tap, and reverse osmosis installation in San Diego is usually a half-day job for a licensed pro. Reverse osmosis forces water through a semi-permeable membrane that rejects dissolved contaminants: dissolved solids, nitrates, heavy metals, PFAS compounds, sodium, and more. The result is water that consistently outperforms bottled water in purity and does it for pennies per gallon rather than dollars. San Diego's imported blend of Colorado River and State Water Project water has a relatively high total dissolved solids count. RO brings that down dramatically. The pros we send install under-sink RO systems with dedicated drinking water faucets, and whole-house RO configurations for households that want filtered water at every tap.

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

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Under-sink reverse osmosis system with dedicated drinking water faucet installed in a San Diego kitchen

What's included in reverse osmosis drinking water?

Free in-home water test measuring TDS, hardness, chloramine, pH, and additional contaminants relevant to your address
Under-sink RO systems with dedicated brushed nickel or chrome drinking faucet
Multi-stage filtration: sediment pre-filter, carbon pre-filter, RO membrane, carbon post-filter
NSF/ANSI 58 certified membranes rated for PFAS reduction
Remineralization stage available to add beneficial minerals back after filtration
Refrigerator line connection for filtered ice and water
Tankless and tank-style configurations based on household demand
Annual membrane and filter replacement service
Whole-house RO configuration for households needing complete dissolved solids reduction

Reverse Osmosis detail work by a Filter Pros San Diego water treatment technician

When do you need reverse osmosis drinking water?

You buy bottled water regularly and want to stop
Your water has a noticeable taste or odor even after whole-house filtration
You have concerns about PFAS, nitrates, heavy metals, or other dissolved contaminants
Someone in the household has a compromised immune system and needs high-purity drinking water
You want filtered water for your refrigerator ice maker
Your well water or city water tests high in total dissolved solids

What do San Diego homeowners ask about reverse osmosis drinking water?

What does a reverse osmosis system cost to run in San Diego?

The running cost is filter changes, not power: a reverse osmosis system uses household water pressure rather than electricity. Sediment and carbon pre-filters are typically changed on an annual cycle and the membrane lasts several years, with the exact interval set by your water quality and how much the household uses. Ask the licensed pro who quotes the reverse osmosis installation to put the replacement schedule and part numbers in writing before you buy.

Is a reverse osmosis water filter better than a pitcher filter?

For dissolved contaminants, yes, and it is not close. A pitcher filter is carbon, which addresses taste and odor; a reverse osmosis water filter pushes water through a membrane that rejects dissolved solids, nitrates, heavy metals and PFAS compounds a carbon pitcher leaves behind. The tradeoff is that an RO system needs installation and a drain connection, where a pitcher does not.

Does reverse osmosis remove PFAS?

Yes. Reverse osmosis is one of the most effective technologies for PFAS reduction. The EPA established enforceable drinking water limits for several PFAS compounds in 2024, and NSF/ANSI 58 certified RO membranes are rated for PFAS reduction. We specify certified membranes on every RO install.

Does RO remove beneficial minerals?

RO removes most dissolved minerals, including calcium and magnesium. Some people prefer to add a remineralization stage after the membrane that reintroduces trace minerals and slightly raises the pH. We offer this as an add-on. For most households the difference in mineral intake from water versus food is negligible.

How much water does an RO system waste?

Older RO systems discharged two to four gallons of drain water per gallon of purified water. Modern high-efficiency membranes and permeate pumps get that ratio down to approximately one to one or better. We specify efficient configurations and can quantify the drain output for your specific system.

How often do RO filters need replacing?

Pre-filters and post-filters typically need replacement every six to twelve months. The RO membrane lasts two to five years depending on your feed water quality. We set a service schedule at install and offer annual maintenance visits.

Can I connect my RO system to my refrigerator?

Yes. The pros we send run a supply line from the RO storage tank to the refrigerator ice maker and water dispenser. This is a common add-on at install and a straightforward retrofit if you already have a system.

Service area

Where do we offer reverse osmosis drinking water in San Diego County?

We provide reverse osmosis drinking water in every city and community in San Diego County. Pick your city for local climate notes and service specifics.

Coastal Reverse Osmosis Drinking Water in Encinitas Encinitas municipal water runs hard, well past the 10-grain mark, and is disinfected with chloramine, which requires catalytic carbon to remove. Salt air accelerates corrosion on standard equipment housings, making stainless steel tanks the only sensible long-term choice for homes from Cardiff bluff parcels to Olivenhain ranchettes.

Coastal Reverse Osmosis Drinking Water in Carlsbad Carlsbad municipal water is very hard (well past the 10-grain hard-water mark) and disinfected with chloramine. Salt air in the coastal zones accelerates corrosion on equipment housings not built for marine exposure. Stainless steel tanks outperform fiberglass alternatives throughout this city.

Coastal Reverse Osmosis Drinking Water in Oceanside Oceanside draws from the same hard, chloraminated North County municipal supply as Carlsbad and Encinitas. Marine-layer moisture year-round means equipment corrosion is a real concern on the west side of the city. Stainless steel tanks handle both the water chemistry and the coastal environment.

Coastal Reverse Osmosis Drinking Water in La Jolla La Jolla has the most aggressive salt-air environment in San Diego County. Municipal water is very hard and chloraminated. Stainless steel equipment is mandatory for longevity in this exposure. Whole-home systems plus under-sink reverse osmosis are standard in estate homes where water quality expectations are high.

North County Inland Reverse Osmosis Drinking Water in San Marcos San Marcos draws from hard, chloraminated municipal supply and runs hot inland summers. High summer temperatures accelerate scale deposits in water heaters and water-using appliances. Hard water damage here shows faster than in coastal neighborhoods.

North County Inland Reverse Osmosis Drinking Water in Escondido Escondido runs the most extreme inland heat in North County with summer highs routinely above 100°F. Municipal water is very hard and chloraminated. Parts of eastern Escondido, Harmony Grove, and rural acreage parcels are on private wells that can carry iron, sulfur odor, sediment, and bacteria.

North County Inland Reverse Osmosis Drinking Water in Poway Poway runs hot inland summers with routine highs above 100°F. Municipal water is very hard. The "City in the Country" character means a meaningful share of residential and equestrian parcels on the eastern foothills run private wells that carry iron, hardness, and occasionally sulfur from the same aquifer systems that serve the broader North County inland region.

East County Reverse Osmosis Drinking Water in El Cajon El Cajon runs the hottest inland temperatures in central East County with afternoon highs routinely 100-110°F from June through September. Municipal water here is hard. Scale buildup in water heaters is accelerated by both the hardness and the heat cycling, shortening appliance life faster here than in almost any other part of the region.

South Bay Reverse Osmosis Drinking Water in Chula Vista Chula Vista is the second-largest city in San Diego County with a water quality picture that splits sharply between the older western neighborhoods and the newer eastern master-planned communities. Western supply from the Otay watershed carries source-water awareness and PFAS concerns. Eastern Chula Vista and Otay Ranch draw newer master-planned households with whole-home filtration interest and higher investment capacity.

Coastal Reverse Osmosis Drinking Water in San Diego City of San Diego municipal water is a blended Colorado River and State Water Project supply treated with chloramines and consistently hard. Hard, chloramine-treated water is the baseline condition across all San Diego neighborhoods from La Jolla to San Ysidro.

See reverse osmosis drinking water in all 67 cities