If you are a homeowner or business owner in Diamond Bar, 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. Diamond Bar is a hillside community in the southwest corner of our service area, mostly 1960s-1990s custom and tract homes. The Country Estates and Diamond Ridge have a lot of larger custom homes. Walnut Valley Water District serves most of the city, and, as across Southern California, the water pressure runs high, so pressure regulator service is a regular call here. Slab leak detection is another common call.
Sweetwater Plumbing is a licensed, family-owned plumber (CSLB #889182) serving Diamond Bar and the Inland Empire, rated 4.8 stars across 588+ reviews. We take urgent calls in Diamond Bar 24/7, with same-day service for most non-urgent jobs booked before noon. 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 Diamond Bar. And when something can’t wait, we offer 24/7 emergency plumbing in Diamond Bar, too.
The Country Estates (gated), Diamond Ridge, Diamond Bar Center area, Pantera Park area.
91765 · 91789
Don't see your ZIP listed? Call us at (909) 312-4516. We likely cover your area.
Diamond Bar has the plumbing profile of an upscale suburb.
CA CSLB License #889182 · C-36 Plumbing Contractor · $2M general liability · Bonded · Los Angeles County coverage. Verify our license at the CA Contractors State License Board.
What we see in each part of Diamond Bar:
Larger luxury custom homes from the 1980s-2000s.
Custom hillside homes. Mostly standard repairs.
1960s-1990s tract. Aging copper supply lines and water heater work.
Newer 1990s-2000s neighborhoods. Mostly upgrades and newer-home repairs.
Diamond Bar was the old Diamond Bar Ranch (named for a "diamond over a bar" cattle brand registered in 1918) until Transamerica bought 8,000 acres in the 1950s to build one of the nation's first big master-planned communities. The first homes went up in 1960, growth ran through the 1970s and 1980s, and the city incorporated in 1989. So the housing is mostly 1960s-1990s hillside tract and custom homes, with larger luxury estates in the gated Country Estates. The city is built into the rolling Brea Canyon hills.
Most of Diamond Bar is served by the Walnut Valley Water District. Like the rest of Southern California, Diamond Bar gets high incoming water pressure, so pressure regulators and properly sized lines matter. It's hard imported water, so expect mineral buildup in heaters and on faucets.
If you're near The Country Estates, Diamond Bar Golf Course or Sycamore Canyon Park, you're in our regular service area.
Chino Hills · Pomona (including Phillips Ranch)
Our techs know Diamond Bar well: the neighborhoods, the lot layouts and the access routes.
Diamond Bar's housing is 1960s-1990s custom and tract construction, with larger luxury custom homes from the 1980s-2000s in The Country Estates. It comes with specific plumbing patterns we've seen for years. We arrive expecting what's typical for Diamond Bar and ready to diagnose what isn't.
We test backflow devices on the district's schedule and file the results with the district for you. We also know the paperwork the district requires.
In Diamond Bar specifically, the most common calls we get are for pressure regulator failures. But the full range of work we do in Diamond Bar includes:
Active leaks, no water, and sewer backups: we dispatch to Diamond Bar 24/7.
Tank, tankless, gas, electric, hybrid. As an A.O. Smith Authorized Service Contractor, we install and service the right heater for your home.
We find and fix slab leaks in homes across Diamond Bar. We use electronic and acoustic detection for pinpoint repairs with minimal demolition.
Gas line work for Diamond Bar homes and businesses. We pressure-test and leak-check every line before it goes back in service.
In Diamond Bar'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.
In Diamond Bar's 1960s-70s tracts, original copper and galvanized supply lines are reaching end of life. We repipe in PEX or copper, phase the work and patch any drywall we open.
We work on cast-iron, clay, ABS and PVC sewer lines in Diamond Bar. Trenchless pipe bursting and pipe lining when the line allows, which can save the yard and the driveway.
Annual testing & certification for Walnut Valley Water District requirements. We file the paperwork directly with the district on your behalf. We also install and repair backflow preventers.
We serve Diamond Bar restaurants, retail, multi-unit, and office properties, with flexible, after-hours scheduling 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.
Freddy, Matt, John, Angel, and everyone else at Sweetwater is 100% 10/10 highly recommend. They have worked on all my plumbing at this point between installing a neat hot water heater, main water lines, and general plumbing issues. They cover it all with…
This was a great experience today with Sweetwater's technician Anthony! He was able to diagnose everything after his thorough scope of the kitchen' sinks plumbing area. He also adressed the issue & advised me what the next step to take to resolve the issue. I…
Sweetwater Plumbing is arguably the most professional contractors that I've ever had as a home owner in my 40 years of home ownership. My techs, Freddy and Angel were great, but the commitment to excellence starts and ends with John, the GM/Owner. I'll NEVER…
