Licensed Plumber in Diamond Bar, CA
Want credentials you can verify? These plumbers are BBB accredited.
Los Angeles County15 plumbers available
All Licensed Plumber Pros in Diamond Bar
All City Plumbing, Air & Electrical
4.9·8.1k reviews·
14 mi away — Serves your areaGoogle Verified
+4 more
Top pick4.9Google
Strengths
Same-day technician dispatch confirmed;
Tech Collen saved customer thousands with honest advice rather…
Named technicians (Carlos N, Andrew, Juan, Steve, Matt)…
Concerns
Not enough data to identify weaknesses
“They were able to send a technician to my house within a few hours.”
Preferred Plumbing and Rooter Services
4.9·136 reviews·
In Diamond BarGoogle Verified
+5 more
Top pick4.9Google
Strengths
Owner David sent crew within an hour for a warranty repair at no…
Full house repipe plus underground water-line replacement under…
After-hours call answered immediately;
Concerns
Not enough data to identify weaknesses
“I highly recommend this plumbing company! They repiped my house with professionalism and friendliness, making the…”
Service Hero Plumbing, HVAC, and Electrical
4.8·1.5k reviews·
8 mi awayGoogle Verified
+5 more
Top pick4.8Google
Strengths
Sunday emergency same-night water heater replacement confirmed:…
Water heater expertise strong: 3 of 5 analyzed service mentions…
Concerns
Not enough data to identify weaknesses
“Last Sunday evening on a late notice emergency call our water heater completely stopped working.”
Barker and Sons Plumbing & Rooter
4.8·4.3k reviews·
10 mi away — Serves your areaGoogle Verified
+4 more
Strengths
Rapid emergency response: 2 of 5 reviewers specifically mention…
Thorough explanation and customer education: 3 of 5 reviewers…
Same-day or rapid job completion: 2 reviewers highlight finishing…
Professional, personable staff named by customers: reviewers…
Concerns
No pricing information provided in any of the 5 reviews;
“came out within just a few hours of my initial contact”
Glendora Plumbing & Heating
4.8·39 reviews·
10 mi awayGoogle Verified
+4 more
Top pick4.8Google
Strengths
Sub-45-minute emergency response confirmed: 9:15 AM call resulted…
Honest scope management: Mike provided temporary workaround…
Water heater repair saved customer from false upsell: Mike…
Concerns
Not enough data to identify weaknesses
“He was honest about the work including having to break flooring to get to the pipe but also provided some options of…”
Top Notch Plumbing Inc.
4.9·534 reviews·
8 mi awayGoogle Verified
+5 more
Top pick4.9Google
Strengths
Weekend water heater failure handled same-weekend: called after…
Fabian explained issue clearly, walked through solution…
Jeff finished kitchen sink replacement in under half the…
Concerns
Not enough data to identify weaknesses
“Joe did a good job to install a tankless water heater for my house.”
24 Rooter & Plumbing, Inc.
5·380 reviews·
8 mi awayGoogle Verified
+6 more
Top pick5.0Google
Strengths
Complete gas-line replacement with professional finish
Whole-home repipe in 1.5 days after utility company flagged a…
Considerate cleanup and site restoration
Concerns
Not enough data to identify weaknesses
“I was having plumbing issues and needed service right away. The team was professional and very responsive.”
SWE Sewer Solutions Construction & Engineering
4.9·123 reviews·
9 mi awayGoogle Verified
+5 more
Top pick4.9Google
Strengths
Sub-1-hour response to single-bathroom emergency (backed-up…
Septic-to-sewer conversion priced below all competitors without…
Camera inspection with before/after video shown to customer;
Concerns
Not enough data to identify weaknesses
“They did a septic to sewer conversion for me in late December and did a fantastic job, his crew was awesome.”
The Sewer Surgeon
4.8·51 reviews·
9 mi awayGoogle Verified
+4 more
Top pick4.8Google
Strengths
Same-day gas line response with safety protocol walkthrough…
Camera-inspected sewer line diagnosis confirmed tree root…
Concerns
Not enough data to identify weaknesses
“The technician arrived promptly and quickly diagnosed our clogged drain issue.”
Roto-Rooter Plumbing & Water Cleanup
4.9·421 reviews·
5 mi awayGoogle Verified
+4 more
Top pick4.9Google
Strengths
Confirmed late-night emergency response (9pm and after 10pm) in 2…
Tech Armando explained hydro-jet vs.
Concerns
Not enough data to identify weaknesses
“My husband and I had a late night plumbing issues so we called Roto-Rooter and they came at 9'O clock at night and…”
Lang's Plumbing & Rooter, LLC
4.9·37 reviews·
9 mi awayGoogle Verified
+6 more
Top pick4.9Google
Strengths
Sub-1-hour emergency response confirmed in 2 reviews
Fair pricing on water leak repair confirmed;
Concerns
Not enough data to identify weaknesses
“Smelled a gas leak in my backyard. Vincent was quick to respond and was able to come the same day.”
Clean Out Plumbing & Rooter
4.8·128 reviews·
9 mi awayGoogle Verified
+3 more
Strengths
Exceptionally fast emergency response: one reviewer reported…
All 5 reviewers praise honest, transparent pricing without…
Consistent high-quality workmanship and attention to detail…
Clear, thorough communication from initial consultation through…
“workmanship was of the highest quality”
Preliminary listing — full review analysis coming soon
J.I.G. Plumbing, Inc
5·951 reviews·
6 mi awayGoogle Verified
+4 more
Top pick5.0Google
Strengths
Hydro-jet drain clearing performed promptly with full cleanup…
Main water line replacement handled with step-by-step…
Competitive pricing on pressure regulator
Concerns
Not enough data to identify weaknesses
“I needed my tankless water heater flushed and found J.I.G. Plumbing online. Scheduling was quick and easy too.”
Courtesy Plumbing
4.8·432 reviews·
7 mi awayGoogle Verified
+4 more
Top pick4.8Google
Strengths
Fast on-site response: dispatched within minutes of scheduling…
Technician education noted in 2 of 5 reviews
Multi-year repeat customer relationship
Concerns
Not enough data to identify weaknesses
“Johnny Martinez was very professional and helpful to educate me about plumbing issues. Greatly appreciated.”
Isaac & Sons Plumbing San Dimas
5·130 reviews·
7 mi awayGoogle Verified
+4 more
Top pick5.0Google
Strengths
Next-day response (under 24 hours) confirmed in 1 review;
Workmanship theme in 2 of 5 analyzed reviews;
Concerns
Not enough data to identify weaknesses
“Isaac has helped me on two occasions and both experiences were excellent.”
Common Licensed Plumber Scenarios
BBB Accredited
BBB accreditation means the business has met standards for trust, advertising, and complaint resolution. It's a verified third-party credential.
Licensed and Insured
All plumbers on our site are licensed in their state. BBB accreditation adds an additional layer of accountability and complaint resolution.
Verified Track Record
BBB-accredited plumbers have a public complaint history and resolution record you can review before hiring.
Warranty Compliance
For warranty-sensitive work (repiping, water heater installation), a licensed and accredited plumber provides documentation that satisfies manufacturers and insurers.
Frequently Asked Questions
How do I verify a plumber's license in CA?
In CA, you can verify plumber licenses through the state licensing board website. All plumbers listed on our site are licensed. Plumbers below with the BBB badge have additional third-party accreditation and a public complaint record.
Why does BBB accreditation matter?
BBB accreditation means the plumber has agreed to resolve complaints, maintain honest advertising, and meet trust standards. It's not a guarantee of quality, but it adds accountability — the BBB tracks complaints and resolution rates publicly.
Are all plumbers in Diamond Bar licensed?
By law, plumbers performing work in Los Angeles County must be licensed. However, some unlicensed handymen advertise plumbing services illegally. Hiring an unlicensed plumber voids insurance claims and can create permit issues when selling your home.
What's the difference between a journeyman and master plumber?
A journeyman plumber has completed an apprenticeship and passed the licensing exam. A master plumber has additional years of experience and can pull permits, supervise journeymen, and run a plumbing business. Both are qualified for residential work.
Other Services in Diamond Bar
Drain Cleaning Water Heater Repair Burst Pipe Repair Repiping Bathroom Remodel Plumbing Sewer Repair Sewer Line Replacement Toilet Repair Faucet Repair Garbage Disposal Repair Sump Pump Repair Gas Line Repair Slab Leak Repair Water Line Repair Kitchen Remodel Plumbing Hydro-Jetting 24-Hour Plumber Same-Day Plumber Affordable Plumber Plumber Cost Clogged Drain No Hot Water Water Leak Low Water Pressure Frozen Pipes Sewage Backup All Emergency Plumbers
Licensed Plumber in Nearby Cities
Need Licensed Plumber Right Now?
Call a top-rated licensed plumber pro in Diamond Bar.
Call Top-Rated Pro NowAre You a Plumber?
Get listed on Fast Plumber Near Me and connect with homeowners who need emergency plumbing help right now. Free basic listings available.