Reverse Osmosis System Installation
Bay Area's #1 Choice

What Is a Reverse Osmosis System and What Does It Remove From Your Water?

A reverse osmosis system forces tap water through a semi-permeable membrane that filters out chlorine and chloramine byproducts, lead, PFAS, and dissolved solids down to a fraction of a micron. The result is water that tastes noticeably cleaner than tap or pitcher-filtered water. Most residential systems install under the kitchen sink and feed a dedicated drinking faucet.

How a Multi-Stage RO System Works

Water passes through three to five stages: a sediment pre-filter, one or two carbon filters targeting chlorine and chloramine, the RO membrane, and often a polishing carbon filter before the storage tank. Each stage removes a different contaminant class, which is why RO outperforms single-cartridge filters on total dissolved solids. Municipal water in San Jose, Sunnyvale, and Cupertino carries moderate hardness plus chloramine, a combination standard carbon filters don’t fully neutralize alone.

RO vs. Standard Water Filters: Key Differences

A pitcher or faucet filter uses activated carbon alone, which improves taste and odor but leaves behind dissolved minerals, most heavy metals, and many PFAS compounds. Reverse osmosis adds the membrane stage, removing a far broader range of contaminants and holding up more consistently over time. The tradeoff is that RO systems need a drain connection and periodic filter changes.

Signs You Need a Reverse Osmosis System Installed

You likely need reverse osmosis system installation if your tap water has a persistent chlorine or metallic taste, your household relies on bottled water daily, or a water test flagged lead, arsenic, or PFAS above your comfort level. These are the most common reasons Bay Area homeowners request installation over a basic filter.

Water Quality Issues Common in Bay Area Homes

SFPUC-supplied areas of the Peninsula, including parts of Menlo Park and Belmont, use chloramine as a secondary disinfectant, which resists standard carbon filtration more than chlorine alone and often carries a chemical smell. Older homes in Palo Alto and Los Gatos also see elevated lead readings from aging service lines, even when the municipal supply tests clean. Hard water is common throughout Saratoga and Campbell, which shortens RO membrane life if a pre-filter isn’t sized correctly.

When an Under-Sink Filter Is No Longer Enough

If you’ve replaced filter cartridges on schedule and the water still tastes off, or a household member needs lower-sodium or lower-TDS water, a carbon filter has reached its limit. At that point, reverse osmosis water filter installation is the practical next step, since it catches contaminants carbon-only systems aren’t built to handle.

Reverse Osmosis System Installation: How the Process Works

Installation starts with a water assessment to identify your incoming pressure, hardness, and any contaminants specific to your address, followed by system selection and a same-day install in most cases. A standard under-sink install typically takes two to three hours.

Pre-Installation Water Assessment and System Selection

Before recommending a unit, we test your cold water supply for pressure and hardness and review any available water quality report for your area. This determines whether you need a standard 3-stage system, an added pre-filter for hard water, or a whole house reverse osmosis system installation for water use beyond a single kitchen tap. Renters and condo owners in Sunnyvale and Milpitas often need a compact tank to fit cabinet space.

What Happens on Installation Day

Our plumber connects the system to your cold water supply line under the sink, installs a drain saddle on the existing drain pipe for wastewater discharge, and mounts the storage tank with pressure pre-set to the correct PSI. A dedicated RO faucet is installed at the counter, separate from your regular faucet. Before we leave, we run the first flush cycle and check every connection for leaks.

Reverse Osmosis System Installation Cost in the Bay Area

Reverse osmosis system installation cost in the Bay Area generally runs from the low hundreds for a basic under-sink unit to several thousand dollars for a whole-home system with pre-treatment. Your final price depends on system tier, existing plumbing access, and whether new supply or drain lines are needed.

Factors That Affect the Final Price

The biggest cost drivers are the number of filtration stages, whether your cabinet already has accessible cold water and drain lines, and whether extra pre-treatment is needed for hardness or sediment. A straightforward reverse osmosis filter installation with existing line access costs less than a whole house reverse osmosis system installation, which involves larger tanks and higher-capacity membranes.

Long-Term Savings on Bottled Water and Appliance Maintenance

A household that buys bottled water regularly typically recovers the installation cost within a year or two. Cleaner water at the tap also reduces scale buildup in coffee makers, ice makers, and water heaters, cutting appliance repair costs over time.

Why Bay Area Homeowners Choose United HVAC, Plumbing & Electrical for Reverse Osmosis System Installation

Homeowners choose United HVAC, Plumbing & Electrical because the company has installed water filtration systems across the Bay Area for over 25 years, carries full state licensing and insurance, and selects each system based on an actual water assessment rather than a standard package.

Licensed, Insured, and Local

Every plumber on our team holds a current California contractor license, and every installation is covered by liability insurance, so you aren’t personally on the hook if a connection fails after the visit. Being based locally also means a faster response if your system needs a follow-up adjustment.

25+ Years Improving Bay Area Water Quality

Our team has worked with the water conditions across San Jose, Cupertino, and Palo Alto for more than two decades, which shapes how we size pre-filters and set membrane specs for local hardness and chloramine levels. That history means fewer callbacks for premature membrane failure.

Custom System Selection Based on Your Water Conditions

We don’t install the same unit at every address. Selection is based on your measured water pressure, hardness, and known contaminants for your service area, so the filters you get match the water you actually have.

Ready to stop buying bottled water? Call United HVAC, Plumbing & Electrical at (408) 539-6936 — we’ll assess your under-sink space and install your RO system same-day.