Plumber in Ontario, CA: Local Plumbing Services for Homes and Businesses

Ontario, CA is one of the fastest-growing cities in the Inland Empire — and with that growth comes more homes, more businesses, and more plumbing calls. Whether you’re dealing with a water heater that stopped working, a drain that won’t clear, or a plumbing issue in a commercial space, you need a plumber who knows the area and shows up when they say they will.

A O Dowd Plumbing serves Ontario and the surrounding Inland Empire with residential and commercial plumbing services. Here’s what we offer, what Ontario homeowners and business owners tend to call us about most, and what to expect when you book a service call.

Residential Plumbing Services in Ontario, CA

We handle the full range of home plumbing needs in Ontario:

• Water heater repair and replacement (tank and tankless)
• Drain cleaning and hydro jetting
• Sewer line inspection, repair, and replacement
• Slab leak detection and repair
• Whole-house repiping (copper and PEX)
• Bathroom and kitchen plumbing repairs and upgrades
• Water softener and filtration installation
• Gas line inspection and repair
• Emergency plumbing — 24/7

Ontario’s housing stock is a mix of newer developments and older neighborhoods built in the 1960s through 1980s. Older homes frequently have galvanized steel supply lines that are due for replacement, and both old and new homes deal with the Inland Empire’s notably hard water, which accelerates scale buildup and reduces the lifespan of water heaters and appliances.

Commercial Plumbing in Ontario, CA

Ontario is home to a large industrial and commercial base — warehouses, distribution centers, retail, restaurants, and office buildings, many clustered near Ontario International Airport and the I-10 and I-15 corridors.

We provide commercial plumbing services including:

• Commercial water heater and boiler service and replacement
• Grease trap cleaning and maintenance for restaurants and food service operations
• High-capacity drain cleaning and jetting
• Backflow preventer testing and certification
• Water line repair and replacement for commercial buildings
• Emergency plumbing response for businesses

Commercial plumbing problems that stop operations need fast response. We understand that a restaurant with a failed water heater or a flooded warehouse floor can’t wait until tomorrow.

Water Heater Service in Ontario, CA

Water heater calls are among the most common service requests we receive from Ontario customers. The combination of hard water and heavily used appliances means water heaters in the Inland Empire tend to need attention sooner than manufacturers’ expected lifespans suggest.

Signs Your Water Heater in Ontario May Need Service

• Water isn’t getting as hot as it used to, or runs out faster
• Popping or rumbling sounds from the tank (mineral scale on the element)
• The unit is 8–12 years old and hasn’t been serviced
• Rust-colored water from the hot side
• Pooling water or corrosion around the base of the unit

We service and install all major brands of tank water heaters, as well as tankless units from Navien, Rinnai, and Rheem. If your unit is near the end of its life, we’ll give you an honest comparison of repair cost versus replacement.

Slab Leak Detection in Ontario Homes

Slab leaks are a known issue throughout the Inland Empire, and Ontario is no exception. Homes built on slab foundations with copper supply lines can develop pinhole leaks over time, particularly when the water is hard and the soil has significant reactive clay content.

A slab leak you can’t see can run for weeks or months, saturating the ground beneath the foundation and potentially causing significant structural problems. Warning signs include warm spots on the floor, unexplained increases in your water bill, the sound of water running when nothing is on, and wet or buckling flooring.

We use acoustic leak detection equipment and pressure testing to locate slab leaks precisely before recommending any repair approach. We won’t start breaking concrete until we know exactly where we’re going.

Why Ontario Homeowners and Businesses Choose A O Dowd Plumbing

We’ve been serving the Inland Empire for years, and Ontario customers choose us for a few consistent reasons: we show up on time, we explain what we find before we start work, and we charge fair prices without surprise add-ons.

We’re a licensed, insured California plumbing contractor. We pull the required permits for permit-required work. We don’t cut corners, and we stand behind what we install.

Schedule Plumbing Service in Ontario, CA

For residential or commercial plumbing in Ontario and the surrounding Inland Empire, call A O Dowd Plumbing at (909) 684-1915 or request service online. We also serve Fontana, Rancho Cucamonga, Chino, Pomona, Upland, Montclair, and surrounding cities. Same-day and emergency service is available.