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TRUSTED BY ALTADENA, CA HOMEOWNERS

  • Average homeowner rating star icon4.6
    Average homeowner rating
  • Verified reviews icon1.2k+
    Verified plumbing services reviews

Top-Rated Plumbers in Altadena - Updated Nov 2026

Avatar for So-Cal Plumbing & Rooter
So-Cal Plumbing & Rooter
4.7(
235
)
Drain Clog or Blockage - ClearWater Heater - Install or ReplaceWater Main - Install, Replace or Repair+13 more

Serving Altadena, CA and surrounding areas

Approved

Super Service Award Winner

In business since 1998

Free estimates

Emergency services offered

"I would like to thank Mr.Jose Montrel for all his help. He was an outstanding plumber to work with, through his profession, honesty, and integrity with the job. If I could recommend anyone for doing your plumbing, I would recommend him as my first choice. We need more people like him in the work force. And even though he wasnâ t the one that fixed the piping, he helped us saved thousands of dollars.thanks Mr Montrel."
One of our truckers
Our Jetter
Wotking hard for our clients
New Drainage Completed
New Clean-out Patch

+4

Response time4 hrs
Response rate95%
89 neighbors recently requested a quote
Avatar for All Season Rooter And Plumbing, Inc.
All Season Rooter And Plumbing, Inc.
4.8(
103
)
Drain Clog or Blockage - ClearFaucets, Fixtures and Pipes - Repair or ReplaceWater Main - Install, Replace or Repair+4 more

Serving Altadena, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2014

Free estimates

Credit card accepted

"We hired All Season Rooter and Plumbing, Inc. to fix all of the mistakes made by a previous plumber. Alvin, the owner is knowledgeable and professional. He spent 2 hours under my house inspecting and photographing everything. He explained everything clearly to me and answered all of my questions. He and his crew fixed all of the mistakes, which were extensive. They came on time and were clean and tidy. They kept me informed throughout the entire process. After getting ripped off before, I was nervous about hiring another plumber. All Seasons Rooter and Plumbing, Inc. is the only plumber I will ever use. I recommend them wholeheartedly ."
Drain Cleaning
Leak Repairs
Sewer Cleaning
Serivce Van
Response time2 hrs
Response rate94%
22 neighbors recently requested a quote
Avatar for Patrick Morrissey
Patrick Morrissey
5.0(
12
)
Bathtub Install or ReplaceDrain Clog or Blockage - ClearDrain Clog or Blockage - Clear - For Business+15 more

Serving Altadena, CA and surrounding areas

Approved

In business since 2018

Free estimates

Emergency services offered

"I needed help with a plumbing issue and I called Morrissey Family Plumbing. They responded immediately and sent Patrick out asap to help with the leak. They were professional and very reasonable with the price. I definitely recommend them and will be using them for all my plumbing needs."
Replace Pipes
Cut to place
Fitting pipes
New pipe under sink
Clogged bath

+8

Response time1 hour
Recommended by100%of homeowners
Avatar for Alliance United Rooter & Plumbing Inc.
Alliance United Rooter & Plumbing Inc.
4.9(
123
)
Gas PipingSewer Main - Install, Replace or RepairWater Heater - Install or Replace+10 more

Serving Altadena, CA and surrounding areas

Approved

In business since 2004

Free estimates

Credit card accepted

We take great pride in our experience, expertise, quality, and customer service that we provide. It is our mission to provide excellent workmanship and complete customer satisfaction from the start to completion of a project. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

drain under kitchen sink
drain under kitchen sink
drain under kitchen sink
drain under kitchen sink
drain under kitchen sink

+62

4 neighbors recently requested a quote
Recommended by98%of homeowners
Avatar for Leon Plumbing
Leon Plumbing
4.8(
79
)
Water Heater - Repair or ServiceTankless Water Heater - InstallWater Heater - Install or Replace+8 more

Serving Altadena, CA and surrounding areas

Approved

Super Service Award Winner

In business since 1983

Free estimates

Emergency services offered

"It is so nice when you can find a plumbing company that you can trust. We had a clogged drain and called Leon Plumbing after I had gotten their number a while ago. I am glad I had kept the number. The plumber came on time, very professional and friendly. Made sure that he covered every part where he was working so it would not get wet or dirty. He explained everything he was doing and even gave advice on what we can do so we dont need to call a plumber often. Their estimate was fair and the final cost was within the estimate."
Tankless Installation (RUR199e with wifi)
Exterior Tankless Water Heater
Dual Tankless Water Heater Installation
Tankless water heater ACE PRO
Tankless Water Heater Service

+8

Response time8 hrs
Response rate94%
15 neighbors recently requested a quote
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Plumbing FAQs, answered by experts

For plumbing in CA, choose scale-resistant materials that withstand the area's hard water. State law requires low-flow toilets, showerheads, and faucets for all permitted upgrades. You must use flexible connectors for gas appliances and install approved seismic strapping on water heaters to meet strict earthquake safety codes. Additionally, select underground piping designed to handle ground movement caused by the region's expansive foothill soils. All fixtures must meet strict state lead-free standards.

Helpful?

As the homeowner of record in Altadena, you must authorize all permit applications for plumbing work. You hold responsibility for the sewer lateral line connecting your house to the public main, making any repair or replacement decisions your choice. Select low-flow fixtures that fit your style and accessibility needs. You must also decide whether to upgrade to a heat pump or solar water heater to comply with strict energy codes.

Helpful?

Sloped foothill terrain in Altadena adds significant complexity to plumbing work, especially for trenching and gravity-fed drain lines. Older properties built between the 1920s and 1960s feature outdated galvanized steel or cast iron pipes that require extensive replacement. Determine if your property uses a private septic system or connects to the county sewer before starting. Finally, elevated mineral content in the local water supply causes scale buildup inside pipes and water heaters.

Helpful?

Address active leaks immediately to prevent rapid mold growth in older Altadena homes. Missing flexible connectors on gas lines or water heaters pose severe life-safety hazards and require urgent attention. Slow drains or sewage odors signal failing sewer laterals that demand immediate camera inspections. Schedule non-urgent exterior plumbing during the dry season to avoid trenching complications. Replace water heaters older than eight years promptly before hard water sediment causes complete failure.

Helpful?

Homeowners in CA frequently underestimate the time required for county permit approvals and final inspections. Opening walls for plumbing repairs often reveals outdated galvanized or lead pipes that demand full replacement. Tree roots easily invade older sewer laterals, creating immediate repair needs. Replacing a water heater also triggers mandatory code upgrades, including seismic strapping and expansion tank installations. Always account for underground utility locating delays before digging on hillside lots.

Helpful?

The Altadena, CA homeowners’ guide to plumbing services

From average costs to expert advice, get all the answers you need to get your job done.