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Reverse Osmosis Installation

Reverse Osmosis Installation in Marin, Sonoma & Napa County

You care about your home's indoor air quality, taking steps to protect your health. But what about the water quality inside your home?

Tap water is treated in California and throughout the country, but many different contaminants still end up in the water supply, which can compromise your health.

Several methods exist for water filtration, including reverse osmosis (RO), a home water treatment that we recommend for any property in the North Bay.

Typically, RO systems are installed in the kitchen, but you could also choose to have your system installed in your garage, basement, or somewhere else where it can remain more concealed.

Eliminate the potentially hazardous chemicals in your drinking water. Schedule a consultation with Ongaro & Sons about installing a reverse osmosis system in your home.

What Is Reverse Osmosis?

A reverse osmosis system is highly effective at removing contaminants, including chloride, copper, chromium, arsenic, and lead, some of which may be in your home's tap water at this very moment!

How Reverse Osmosis Works

Reverse osmosis systems filter and flush out contaminants in water by moving water across a semi-permeable membrane. The result is cleaner, purified water for drinking, cooking, and bathing.

Benefits of Reverse Osmosis Water Filtration Systems

Many households rely on basic pitcher filters or refrigerator filters, but these systems typically only target chlorine and sediment. A reverse osmosis system offers a much higher level of filtration, providing peace of mind that your family is drinking truly purified water, it's easy to see why reverse osmosis systems are so beneficial!

You don't want to be drinking or cooking with impure water, otherwise, you will risk compromising your health by ingesting these dangerous chemicals and contaminants.

Reverse osmosis systems effectively filter out a wide range of harmful substances, such as lead, chlorine, arsenic, nitrates, PFAS, and more. This multi-stage process provides cleaner, safer water from every tap, making it one of the most comprehensive home filtration options available today.

By removing up to 99% of contaminants, RO systems help safeguard you and your family from long-term exposure to chemicals, metals, and microorganisms commonly found in unfiltered water. It's a smart investment for families who prioritize health and wellness.

Reverse osmosis doesn't just make water safer, it improves taste dramatically. Many people notice an immediate difference: no more chemical aftertastes, chlorine odors, or cloudy appearance. Enjoy crisp, refreshing water that encourages better hydration.

Contaminated or hard water can damage pipes and appliances over time. An RO system helps reduce these risks by eliminating minerals and impurities that cause corrosion, clogs, and scale buildup, extending the lifespan of your plumbing, fixtures, and appliances.

Using RO-filtered water in cooking improves the taste and quality of everything you prepare, from pasta and rice to coffee and soups. Additionally, without harsh minerals or chemicals, it can help reduce dryness, irritation, and buildup, leaving your skin smoother and your hair more manageable, especially in households with hard water.

Stop spending money on bottled water or replacing filters in less effective systems. With a reverse osmosis system, you get consistently high-quality water directly from the tap, saving money and reducing plastic waste over time.

Trusted Reverse Osmosis Services in Marin, Sonoma & Napa County

Serving Santa Rosa, San Rafael, Kentfield, and elsewhere in Sonoma, Napa, and Marin counties since 1932, Ongaro & Sons is a fourth-generation, family-owned business committed to high standards, straightforward service, and lasting solutions.

Our team is committed to protecting your health, and we know that it can start with the water in your home. When you're looking for a solution for polluted or hard water, we have many options available, including water softeners, whole-home water filtration, and reverse osmosis systems.

Speak with our experts to learn about the course of action we recommend to help you achieve all of your water quality goals. You don't have to deal with water that is too high in iron, calcium, or heavy metals. Take back control of your home's contaminated water by turning to Ongaro & Sons for help!

Professional Installation by Ongaro & Sons

Trusted since 1932, Ongaro & Sons is your go-to team for professional water treatment solutions. When you choose us for your reverse osmosis installation, you're getting:

  • Expert system recommendations tailored to your home's needs.
  • Professional installation by licensed, experienced plumbers.
  • Clean, organized workmanship and full system testing.
  • Ongoing service, filter changes, and maintenance as needed.

We install compact under-sink RO units, whole-house systems, and multi-stage filtration setups depending on your needs, space, and water source.

Reverse osmosis filtration system under a sink

Is Reverse Osmosis Right for You?

If you're concerned about the taste, safety, or appearance of your water, an RO system could be the perfect solution. It's especially helpful if:

  • You have well water or live in an area with older pipes.
  • You have family members with sensitive immune systems.
  • You're looking to reduce plastic bottle use.
  • You want peace of mind about what's in your water.

Let our team test your water and explain your options. We'll help you make an informed choice without any pressure.

Water filtration and tankless water heater system installed in basement with insulated pipes and yellow shut-off valves.

Schedule Your Reverse Osmosis Service

Whether you need a new reverse osmosis installation, replacement filter changes, or expert water testing, our licensed plumbers are ready to help. We proudly serve Sonoma, Marin, and Napa counties, including Santa Rosa, San Rafael, Kentfield, and surrounding cities. Call us now at 415-741-2820 or book your appointment online for cleaner, safer water you can trust.

Your Comfort, Our Priority

Ongaro & Sons is your trusted heating, cooling, plumbing, electrical, and solar expert, specializing in reliable maintenance and repair services that keep your home running efficiently year-round.

Our certified technicians deliver unmatched expertise with fast, friendly service across Marin, Sonoma and Napa County. From HVAC tune-ups to plumbing repairs and electrical upgrades or solar solutions, we focus on energy-efficient performance and long-term comfort. Count on us to maintain the systems that power your home and keep your environment just the way you like it.

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Licensed, Insured, Background-Checked

Our technicians are licensed, experienced, and trained to service all makes and models.

Locally Owned and Operated

Serving the Napa, Marin, and Sonoma communities with personalized, hometown service.

Reliable Repairs

We respond quickly and get the job done right the first time, with no surprises.

Since 1932

Why Ongaro & Sons for Reverse Osmosis Systems

Reverse osmosis is the right answer for specific contaminants and overkill for others.

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We confirm reverse osmosis is what your water needs

It removes dissolved solids very effectively. If your issue is sediment or hardness, a simpler and cheaper system does the job better.

Pre-treatment specified where it protects the membrane

Feeding hard or sediment-heavy water straight into a membrane shortens its life considerably. Pre-filtration is part of the design, not an upsell.

Storage and flow matched to the household

Production rate is slow by design. Storage capacity is what determines whether that is noticeable.

Drain and air gap installed correctly

An inspected detail and a common failure point on retrofits.

Waste ratio explained before you buy

Reverse osmosis sends water to drain to produce clean water. You should know that ratio in advance, particularly in a drought year.

Ongaro maintenance van
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Ongaro Maintenance Plans

Annual maintenance on your home systems provides safeguards and comfort to you and your family. Members get priority scheduling, discounts, and proactive checkups that catch problems early.

Member Discounts

5% off every repair and replacement, all year long.

Peace of Mind

Proactive checkups catch issues before they become big problems.

Courtesy Reminders

We call you to schedule: never miss a seasonal service.

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Value That Lasts

With Ongaro & Sons, you’re investing in quality, integrity, and service that stands the test of time. Explore our current promotions and see the difference real value makes for your HVAC, plumbing, and electrical needs.

Frequently Asked Questions

Can an RO system remove hard water minerals like calcium and magnesium?

Yes, RO systems reduce hardness-causing minerals, but they’re not a substitute for a whole-home water softener. For households with very hard water, it’s best to combine a water softener with a reverse osmosis system.

Do I need a reverse osmosis system if I already have a water softener?

Yes, softeners remove minerals, while RO systems target smaller impurities and improve taste and purity.

How often does a reverse osmosis system need maintenance?

RO systems require filter changes every 6–12 months, depending on water quality and usage. The RO membrane typically needs to be replaced every 2–3 years. Routine maintenance ensures optimal performance and water quality.

Is reverse osmosis water safe for cooking and drinking?

Yes, RO water is highly purified, making it ideal for drinking, cooking, ice cubes, and even baby formula.

Is sediment filtration necessary if I already have a water softener or RO system?

Yes. Sediment filters are essential even with a softener or reverse osmosis system. They act as a pre-filter, protecting more sensitive systems from clogging or premature wear caused by particulate matter.

Where is a reverse osmosis system installed in the home?

Most residential RO systems are installed under the kitchen sink and connected to a dedicated faucet. Whole-house RO systems are also available, though they are typically only used in extremely poor water quality areas.