If you are a homeowner or business owner in Ontario, we would be glad to help and to treat your home or business like our own. We answer the phone 24/7 at (909) 312-4516. Ontario is one of the largest cities we serve. ZIP codes 91761, 91762 and 91764 cover everything from the Victorian-era homes lining Euclid Avenue (where we often replace 100-year-old galvanized and cast-iron pipe) to the new construction in Ontario Ranch south of Riverside Drive. Different ZIPs, very different plumbing: we handle all of it. Commercial calls near the Ontario Mills shopping district and ONT airport warehouses are a regular part of our work.
Sweetwater Plumbing is a licensed, family-owned plumber (CSLB #889182) serving Ontario and the Inland Empire, rated 4.8 stars across 588+ reviews. We take urgent calls in Ontario 24/7, with same-day service for most non-urgent jobs booked before noon. Most of the city gets its water from the Ontario Municipal Utilities Company (OMUC). Call (909) 312-4516 24/7.
From a slow-draining sink to a slab leak under the foundation, and from full repipes to gas line installations, we handle nearly every part of a residential or commercial plumbing system in Ontario. And when something can’t wait, we offer 24/7 emergency plumbing in Ontario, too.
Downtown Ontario, Ontario Ranch (South Ontario), North Ontario, Ontario Mills area, East Ontario near the airport.
91761 · 91762 · 91764
Don't see your ZIP listed? Call us at (909) 312-4516. We likely cover your area.
Ontario packs three building eras into one city: historic Euclid, the postwar core, and brand-new Ontario Ranch. Each plumbs its own way.
CA CSLB License #889182 · C-36 Plumbing Contractor · $2M general liability · Bonded · San Bernardino County coverage. Verify our license at the CA Contractors State License Board.
What we see in each part of Ontario:
Victorian-era homes along Euclid Avenue dating to the 1890s-1920s. Original galvanized and cast-iron pipe is the norm.
Newest part of the city: 2010s+ master-planned homes south of Riverside Drive. Mostly upgrades and newer-home repairs.
Mid-century tract homes with aging galvanized supply lines and water heaters reaching the end of their life.
Heavy commercial presence: restaurants, retail and warehouses.
Mix of older residential and industrial. Warehouses near ONT generate steady commercial plumbing work.
The Euclid Avenue corridor near downtown holds late-1800s and early-1900s homes from the original Chaffey "Model Colony" (founded 1882), often with original cast iron and galvanized pipe. The postwar core is full of 1950s-60s tract homes with galvanized supply lines now failing from the inside. And Ontario Ranch (the New Model Colony, annexed 1999, south of the 60) is some of the newest construction in the Inland Empire, on PEX and modern materials but with high household demand.
Ontario runs its own water system, the Ontario Municipal Utilities Company (OMUC), whose lineage traces back to the mutual water company the Chaffey brothers set up in the 1880s, when each landowner literally owned a share of the water piped down Euclid Avenue by gravity. Today it’s hard groundwater, so hard-water scale on heaters and fixtures is routine. Water pressure runs high here, as it does across Southern California, so we recommend testing your pressure regulator every year.
Find your local water department in our Inland Empire directory →
If you're near Ontario International Airport (ONT), Ontario Mills, Toyota Arena, the Euclid Avenue historic corridor or the Ontario Convention Center, you're in our regular service area. Our techs know the neighborhoods, the typical lot layouts, and the access routes.
Montclair · Upland · Rancho Cucamonga · Chino · Eastvale
Family-owned and based in Montclair since 2010. Our techs know Ontario well.
Ontario's housing covers a wide range, from Victorian-era homes downtown (Euclid corridor) to brand-new construction in Ontario Ranch (south of the 60), so we arrive knowing what to look for and ready to diagnose what isn't typical.
We test backflow devices on Ontario Municipal Utilities' schedule and file the results with the utility for you. We also know the paperwork the utility requires.
In Ontario specifically, the most common calls we get are for aging plumbing in the historic Euclid Avenue homes (original cast iron, plus older lead-soldered copper) and tankless water heater repair in the newer Ontario Ranch homes. But the full range of work we do in Ontario includes:
Active leaks, no water, and sewer backups. Dispatched to Ontario 24/7.
Tank, tankless, gas, electric, hybrid. Ontario's older homes often need code-update work around the unit during replacement.
Older Ontario homes built on slab foundations can develop slab leaks where copper lines pass under the slab. We use electronic and acoustic detection and repair without tearing up floors when possible.
Natural gas service across Ontario, residential and commercial. Every job is pressure-tested and leak-checked before the gas goes back on.
In Ontario's older homes, the sewer laterals are often cast iron or clay, with root intrusion. Cable for blockages, hydrojet to clear roots and grease. Camera inspection on every main line.
Aging galvanized lines are a frequent culprit in Ontario's older homes. Our repipes use PEX or copper and run in phases, and we patch any drywall we open.
Original clay laterals are common in older Ontario neighborhoods. When they crack or roots get in, we line them in place or replace them. We work on cast-iron, clay, ABS and PVC lines, trenchless when possible.
Annual testing & certification for Ontario Municipal Utilities requirements. We file the paperwork directly with the utility on your behalf. We also install and repair backflow preventers.
Commercial work across Ontario: restaurants, retail, warehouses, multi-tenant, and offices. Flexible, after-hours scheduling is available around your operating hours.
Sweetwater Plumbing's service area extends across San Bernardino, Riverside and eastern Los Angeles counties.
Not on the list? Call us at (909) 312-4516. We serve 24 cities across the Inland Empire.
Freddie and his crew were very professional respectful kind and understanding. I had my mobile home completely repiped and did little extra for me. Now I am set in My forever home knowing I have new and good pipes and water heater. I can not thank you enough.
Angel Gonzalez did a great job and was very professional. He advised us on good ways to clean our drains and keep them odor-free. Thank you for your excellent customer service, Angel!
John and his team have been extremely helpful in alleviating my plumbing issues on two separate occasions now, and I would not hesitate to recommend them.They have been very clear about estimates, scope of work, have arrived promptly at decided start times…
