Are you spending a fortune on bottled water or buying countless filters for your water pitcher? Have you noticed a drop in water quality whenever you turn on the tap or step into the shower?
It may be time to consider a whole-house water filtering system—clean, safe water for your family’s health, comfort, and peace of mind.
Ongaro & Sons provides professional water filtration services to remove impurities, improve taste, and protect plumbing systems. Ongaro & Sons is a trusted source for water treatment services in Marin, Sonoma, and Napa counties, as well as all surrounding Northern California communities.
Whether you’re dealing with hard water, chlorine, sediment, or other contaminants, we offer tailored solutions that address the specific water quality concerns in your area. Our team has extensive experience installing and servicing a wide range of filtration systems, including whole-house filters, under-sink systems, and advanced reverse osmosis units. When you are ready to improve your water quality, contact us for a recommendation and installation.
Pure, Clean Water for a Healthier Home: Expert Water Filtration Services
We start with a thorough water analysis to identify the exact contaminants present in your supply, then recommend the most effective filtration system to meet your needs and budget.
With the right system in place, you’ll enjoy cleaner drinking water, longer-lasting appliances, and softer skin and hair. Plus, you’ll reduce your reliance on bottled water, helping the environment and your wallet.
Trust Ongaro & Sons to deliver reliable, high-quality water filtration services backed by decades of experience, expert workmanship, and a commitment to customer satisfaction. We’re here to make your home’s water safer, healthier, and better-tasting—every day.
Why Filter Your Water?
While most Northern California residents rely on municipal water that meets federal standards, that doesn’t always guarantee it’s free of contaminants. Events like wildfires, floods, or treatment plant failures can compromise water quality—leading to boil water notices or temporary exposure to harmful bacteria or chemicals.
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 Northern California. 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.
PHCC- and NATE-Certified Experts
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—no surprises.
Whole-House Water Filter Installation
We can install a whole-house filtering system close to the entry point of the main water line in your home, enabling it to screen out contaminants before they reach your faucets, showerheads, and appliances.
A home water testing kit is a useful tool for identifying contaminants in your water and determining which you want to remove.
At Ongaro & Sons, we offer flexible financing options (subject to approved credit) to maintain your water filtering system and other plumbing equipment.
Choosing a Water Filter System
Our trained pros at Ongaro & Sons can help you decide which filter is best for your home. A carbon filter, for example, can screen out some chemicals, such as chlorine, volatile organic chemicals, and some heavy metals. Block carbon filters can also eliminate some microorganisms like Giardia, which can cause intestinal infections.
Sediment filters rid your water supply of dirt, rust particles, and sand. They often pair with carbon or ultraviolet (UV) filters that kill bacteria, algae, and viruses.
A reverse osmosis system uses high water pressure to push water through a semipermeable membrane that filters some chemicals, minerals, and bacteria. This system is generally installed in the kitchen, where pristine water is needed for consumption and cooking.
We also install water softeners that remove iron, manganese, calcium, and magnesium from your water. These systems can also prevent heavy metals, nitrates, and some radioactive materials from entering your water supply.
Professional Water Treatment Maintenance
Routine maintenance is essential to keep your water treatment system performing at its best. Over time, filters can clog, components can wear down, and mineral buildup can reduce system efficiency. At Ongaro & Sons, we offer expert water treatment maintenance services to ensure your system continues delivering clean, safe water throughout your home.
Our skilled technicians will inspect, clean, and service all parts of your filtration or softening system, including replacing filters, checking for leaks, and ensuring proper water pressure and flow. Regular maintenance not only extends the life of your equipment but also helps prevent costly repairs and ensures your water quality stays consistently high.
In Northern California, where water quality can vary due to seasonal changes, drought conditions, and aging municipal infrastructure, professional upkeep is especially important. Whether you have a whole-house filter, water softener, or reverse osmosis system, Ongaro & Sons will keep it running efficiently and reliably.
Let us help you protect your investment and enjoy cleaner, healthier water year-round. Ask about our convenient Ongaro Maintenance Plans for worry-free service and long-term peace of mind.
Enjoy Cleaner, Safer Water With Ongaro & Sons
Ongaro & Sons is committed to helping you protect your home and your health with high-quality water treatment solutions. Whether you’re dealing with hard water, sediment, chlorine, or potential contaminants, our expert team will recommend and install the right system for your specific needs.
With nearly a century of experience serving Northern California, we understand the unique water quality challenges faced in Windsor, San Rafael, Novato, Strawberry, Marin City, Cotati, and the surrounding cities of Marin, Sonoma, and Napa counties.
Our licensed plumbers and water treatment specialists are trained to identify problems early, perform seamless installations, and keep your system working efficiently for years. If you’re ready to enjoy better-tasting water, healthier skin and hair, and greater protection for your plumbing and appliances, we’re here to help.
Contact us today at 415-741-2820 or request services online to start your journey to healthier, safer water.
5%
Member Discount
Ongaro Maintenance Plans
Annual maintenance on your home systems provides safeguards and comfort to you and your family. Neglecting your routine checkups can potentially put everyone at risk.
With these annual visits, our experienced technicians use the latest technology to help find unsafe problems before they can become bigger problems.
Maintenance Plan Benefits
Member benefit of 5% discount on repairs and replacements.
Proactive maintenance identifies and addresses issues before they become big problems.
Courtesy reminder calls for scheduled services and appointments.
Special Offers
Enjoy our seasonal promotions and save on your next service.
Limited-time offers—don’t miss out!
Free MacBook Air
With HVAC Upgrade*
$700 Off
Hydro Jet Sewer Cleaning*
FREE
Camera Inspection*
$69
HVAC System Diagnostic*
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Frequently Asked Questions
Yes—mineral buildup can reduce efficiency and cause overheating. Water softening can help extend your boiler’s lifespan.