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Bay Area Water Quality Services

Reverse Osmosis System
Installation
in Bay Area, CA

Do you buy bottled water because you don't trust what comes out of the tap? Are you concerned about PFAS, lead, nitrates, or chloramine in your drinking water? A reverse osmosis system forces water through a semi-permeable membrane with pores as small as 0.0001 microns, removing up to 99% of dissolved contaminants that carbon filters and water softeners cannot touch. It is the most thorough water purification technology available for residential use.

At United Plumbing and Water Heaters, we install under-sink RO systems for drinking water and whole-house RO systems for complete home purification. We serve Dublin, CA, Pleasanton, Livermore, and communities along the I-80 corridor up to Sacramento and Roseville. Our licensed plumber will test your water, recommend the right system for your contaminant profile, install the unit with a dedicated faucet and drain connection, and verify the output water quality with a TDS meter before leaving. We handle everything from a basic 5-stage kitchen install to multi-stage whole-house systems with booster pumps and storage tanks.

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★★★★★ 4.9/5 Average | ✓ CSLB Licensed #1116823
Reverse Osmosis System Installation Bay Area

Signs You Need a Reverse Osmosis System

Carbon filters and water softeners handle taste, odor, and hardness. But they cannot remove dissolved contaminants like lead, arsenic, nitrates, PFAS, fluoride, and pharmaceutical residues. If your water quality report shows elevated levels of any regulated or emerging contaminant, or if you simply want the purest possible drinking water for your family, an RO system is the solution. If any of the following apply, contact us for a free water quality consultation.

Concern About PFAS in Drinking Water

PFAS (per- and polyfluoroalkyl substances) are synthetic chemicals found in the water supply of many Bay Area communities. They do not break down naturally and have been linked to serious health issues. Reverse osmosis is one of the few residential filtration technologies proven to remove up to 99% of PFAS compounds. Standard carbon filters reduce some PFAS but cannot remove them reliably.

Elevated Lead or Heavy Metals

Lead can leach into drinking water from older brass fixtures, lead solder joints, or aging service lines. Even low levels of lead are harmful, especially for children. An RO membrane removes lead, arsenic, mercury, chromium-6, and other heavy metals to levels well below EPA maximum contaminant limits. If your home was built before 1986, testing for lead is especially important.

High TDS (Total Dissolved Solids)

A TDS reading above 500 ppm means your water carries a high concentration of dissolved minerals, salts, and other inorganic compounds. Water with high TDS can taste flat, salty, or metallic. An RO system typically reduces TDS by 90% to 99%, producing water with a clean, neutral taste. You can check your TDS with a $15 handheld meter from any hardware store.

Spending Money on Bottled Water

A family of four spending $30 to $50 per month on bottled water is paying $360 to $600 per year. An under-sink RO system produces purified water for approximately $0.02 to $0.05 per gallon. The system pays for itself within 1 to 2 years and eliminates the ongoing cycle of buying, carrying, and disposing of plastic bottles.

Nitrates in Well Water

If your home is on a private well, nitrate contamination from agricultural runoff or septic system leakage is a real concern in parts of the Bay Area and the Sacramento Valley. Nitrate levels above 10 mg/L are unsafe for infants and can pose health risks for adults. Reverse osmosis removes 85% to 95% of nitrates from drinking water. No other residential filter type achieves comparable nitrate removal.

You Want the Highest Purity for Cooking and Drinking

Reverse osmosis produces water that is comparable to or better than most bottled water brands. It removes chloramine, fluoride, pesticides, pharmaceutical traces, microplastics, and virtually all dissolved solids. If water quality is a priority for your household, whether for health reasons, for infant formula, or simply for better-tasting coffee and cooking, an RO system delivers the highest level of residential purification available.

How Our RO System Installation Works

01

Call or Book Online

Contact us by phone or through our online form. We confirm your appointment immediately and give you an arrival window.

02

Water Test & Consultation

Our licensed plumber tests your water for TDS, hardness, chloramine, pH, and specific contaminants. We evaluate the under-sink space or main line installation point, check water pressure (RO systems need 40 to 80 PSI to function), and recommend the right system for your needs.

03

Flat-Rate Quote

We give you a clear, flat-rate price before starting. No surprises, no hidden fees. Under-sink RO systems run $300 to $900 installed. Whole-house RO systems run $4,800 to $8,000 installed.

04

Installation & Verification

We mount the system, connect the feed water line, install the drain line for wastewater, drill and mount the dedicated RO faucet (under-sink) or connect to the main line (whole-house), flush the membrane per manufacturer specs, and verify output water quality with a TDS meter. Every job is backed by our warranty on parts and labor.

Why Bay Area Homeowners Choose Us?

Over 7 years and 16,000+ jobs completed across Bay Area & Sacramento.

  • ✓CSLB License #1116823
  • ✓Flat-rate pricing
  • ✓FREE water quality testing
  • ✓Warranty on all parts and labor
  • ✓Available 24/7 with no overtime charges
  • ✓TDS verification on every installation
  • ✓We install under-sink and whole-house RO systems
United Plumbing Team
RO System Brands We Install
APEC iSpring Waterdrop Culligan Pentair 3M

RO System Service Areas in Bay Area

We provide reverse osmosis system installation across the following cities and surrounding areas:

Fremont
Concord
Walnut Creek
Berkeley
Richmond
Pleasanton
Livermore
Dublin
San Ramon
Vallejo
Napa
Fairfield
Vacaville
Sacramento
Roseville
Davis
Elk Grove

Frequently Asked Questions

Common questions about reverse osmosis system installation in Bay Area.

How much does RO system installation cost?
An under-sink reverse osmosis system costs $300 to $900 installed, including the unit, dedicated faucet, drain connection, and labor. A tankless under-sink RO system (no storage tank, higher flow rate) costs $500 to $1,200 installed. A whole-house RO system with storage tank and booster pump costs $4,800 to $8,000 installed. The total depends on system type, countertop material (drilling through granite costs more), plumbing accessibility, and whether your water pressure needs a booster. Contact United Plumbing and Water Heaters for an accurate estimate.
How long does RO system installation take?
A standard under-sink RO system takes 1 to 3 hours to install. This includes mounting the unit inside the cabinet, tapping into the cold water line, connecting the drain line to the sink drain, drilling the countertop for the dedicated faucet, and flushing the membrane. If the countertop is granite or quartz, drilling takes longer and requires a diamond-tipped bit. Whole-house RO systems take a full day or more because they involve connecting to the main line, installing a storage tank, mounting a booster pump, and running additional plumbing.
What does reverse osmosis remove from water?
Reverse osmosis removes up to 99% of dissolved contaminants from water. This includes lead, arsenic, mercury, chromium-6, fluoride, nitrates, PFAS, chloramine, chlorine, pesticides, pharmaceutical residues, microplastics, and total dissolved solids (TDS). The RO membrane's pore size of 0.0001 microns is small enough to block virtually all dissolved inorganic and organic compounds. Pre-filters in the system also catch sediment, rust, and larger particles before they reach the membrane.
Does reverse osmosis waste water?
Yes. A standard RO system produces 3 to 4 gallons of wastewater for every 1 gallon of purified water. This is called the reject ratio or recovery rate. Higher-efficiency systems (marketed as 1:1 or 2:1 ratio) waste less by recirculating some of the reject water. The wastewater goes down the drain and carries the concentrated contaminants that were rejected by the membrane. For an under-sink system producing 3 to 5 gallons of drinking water per day, the additional water usage is modest, roughly equivalent to one extra toilet flush per day.
Do I need a tank or tankless RO system?
A tank-based RO system stores 2 to 4 gallons of purified water in a pressurized tank inside the cabinet. When you open the faucet, water flows from the tank immediately at full pressure. A tankless RO system purifies water on demand and delivers it directly without storage. Tankless systems produce higher flow rates (up to 600 GPD vs. 50 to 100 GPD for tank models) and take up less cabinet space. However, tankless models cost more. For most households a tank-based 5-stage system is sufficient for drinking and cooking needs.
How often do RO filters need to be replaced?
A standard under-sink RO system has three types of replaceable components. The sediment and carbon pre-filters should be replaced every 6 to 12 months. The RO membrane lasts 2 to 3 years under normal use. The post-carbon polishing filter should be replaced every 12 months. The exact schedule depends on your water quality and daily usage volume. If you skip filter changes, contaminants break through the clogged pre-filters and shorten the membrane's lifespan. Annual filter replacements cost $40 to $150 depending on the brand. Membrane replacement costs $50 to $100.
Does RO remove minerals my body needs?
Yes, reverse osmosis removes beneficial minerals like calcium and magnesium along with the contaminants. However, the amount of minerals you get from drinking water is very small compared to what you get from food. A single glass of milk contains more calcium than 30 gallons of Bay Area tap water. If remineralization is important to you, many RO systems include an optional alkaline remineralization filter as a final stage that adds back trace minerals and raises the pH to 7.5 to 8.5. We can install a system with or without this stage based on your preference.
What water pressure do I need for an RO system?
An RO system requires a minimum of 40 PSI of incoming water pressure to push water through the membrane effectively. The ideal range is 50 to 80 PSI. If your home's water pressure is below 40 PSI, the system will produce water very slowly and the membrane will underperform. A booster pump can be added to bring the pressure up to the required level. Our plumber tests your water pressure during the consultation and includes a booster pump in the quote if needed.
Can I install an RO system myself?
A basic under-sink RO system is designed for DIY installation. The kit typically includes push-fit connectors, a saddle valve for the drain, and a self-piercing valve for the cold water line. If you are comfortable with basic plumbing and drilling a hole in your countertop, you can complete the install in 2 to 3 hours. However, drilling through granite or quartz requires a diamond-tipped bit and careful technique to avoid cracking. If the faucet hole is misaligned or the drain connection leaks, the cabinet below can sustain water damage before you notice. Professional installation eliminates these risks and ensures the system operates at the correct flow rate from day one.
What brands of RO systems do you install?
We install reverse osmosis systems from all major manufacturers including APEC, iSpring, Waterdrop, Culligan, Pentair, and 3M. For most under-sink installations we recommend APEC or iSpring 5-stage systems for their proven membrane quality, easy filter replacement design, and NSF/ANSI 58 certification. For tankless high-flow systems we recommend the Waterdrop G3 or G3P800 series. We can install a system you've already purchased or help you select the right model based on your water test results and daily usage needs.

Need RO System Installation in Bay Area?

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