•   Sewer and drain specialists     
  •   Licensed, insured & bonded
  •   Full service plumbers
  •   Competitive rates
  •   100% Guaranteed work!
" Your local plumbing service in
San Jose & the South Bay"​

We are the best locally owned and operated plumbing & sewer company in Sunnyvale and Silicon Valley.

Our plumbers service Sunnyvale, San Jose, Atherton, Campbell, Cupertino, Los Altos, Los Gatos, Menlo Park, Mountain View, Palo Alto, Santa Clara and Saratoga, CA. With over 70 years of community ties, community volunteer and professional plumbing and sewer work within Silicon Valley, we strive to always give the most honest and fair pricing served with the best customer service and high quality workmanship. Our quotes are always 100% free and our rates never go up because we believe that emergency plumbing is not something you can control or plan, so it should NEVER be the customer's fault if something should happen on weekend, holiday or in the evening. So give us a call! We're your local, friendly and dedicated plumbers.

Comet Plumbing & Sewer Co. performs as a plumbing contractor with professional plumber service to satisfy any of your plumbing needs. We will send a plumbing expert to carry out any plumbing repair. Our plumbing service is always sewer emergency. Emergency plumbing at no extra cost, any time, day or night, holidays, weekends, even during a big party, we come out to fix your plumbing problem at no additional cost to you. Why? We believe that it’s not the customer’s fault when a plumbing emergency arises. Toilets, drains, sewers, sinks, faucets, various pipes in kitchens and bathrooms break, leak, back-up, overflow and just plain don’t work sometimes. You do your best to keep your home in working condition, and we understand that. We will never charge you an arm and a leg just because it’s a holiday or because your toilet has water leaking everywhere from a backed up sewer pipe. We’re members of this community, and we believe that by treating our customers the way we would want to be treated, in a fair and honest manner, we can help out in our part of building the type of community that we want to live in. 

We have competitive prices and offer free estimates for any job and all work needed to make plumbing affordable.
We love plumbing and sewer work! Everyone at this company is a member of your community, and we strive to do the best job in any and every plumbing area of expertise. We do plumbing in San Jose, plumbing in Sunnyvale, plumbing in Mountain View, plumbing in Campbell, plumbing in Cupertino, plumbing in Los Altos, plumbing in Saratoga, plumbing ANYWHERE in the South Bay area and Silicon Valley. We’re your local bathroom plumber, kitchen plumber, water main plumber. That means we do faucet plumbing, sink plumbing, toilet plumbing and much, much more. If there is something that you think might be plumbing related or that you even need advice on when it comes to pipes, sewers, drains, or anything related to what a plumber can help with, don’t hesitate to call. We’re your local, top quality, top value, plumbers.



​We help you find the most cost effective and best solution to fit your problem to save you time and money. We are able to under bid virtually every other plumbing company in the Silicon Valley. Call us now and let us show you true value, great service and honest prices.

If you have rusty water, low water pressure, rattling and banging pipes, then replacing your old galvanized water pipes might be just what you need. Call us for your free estimate.



Keep getting a sewer main line back up & over flowing toilets? Call our specialists now to inspect & diagnose your sewer line problem.

Do you see your water meter indicator spinning and you have no idea where your leak is? CALL US!

Traditional Tank or Tankless Water Heaters – We dispose of your old water heater FOR FREE with any new water heater installation.

Is your drain simply not draining or taking forever to get that water down? We can employ many cost effective methods to get your drains running like they are brand new again.

Leaking or Broken Water Mainline (fresh water supply line) spot repairs and full replacements.


We offer many more plumbing services. Call us now so we can help try to solve your plumbing problems, and if we can’t, we will do our best to get you the help you need!


* 10% Off Labor for ANY Plumbing Service *

* $50 Off - Water Heater Replacement *

Plus free take-away and recycling of your old water heater

* FREE Sewer Camera Survey - $450 value *

When you replace your sewer line

- How do you get these discounts? -
Just mention which discount you want and where you found out about us when calling to request service.

Great Company,Great Service Techs.I had a plumbing problem that required a plumbing contractor not some guy in a truck with a 50' power snake .
The man from Comet was very professional Did not talk down to me as others have .Assessed the problem gave me a very reasonable estimate and preformed the work on time.And no extra charges!!!!! I would use this company again and do not hesitate and recommend it. Its nice to know there are still honest and reliable Plumber Contractors out there
Bruce Houseman   12/5/2011

Richard K. April 12, 2011 
Los Altos plumber. ★★★★★
I found this company in my Los Altos Yellow Pages. They checked out my hot water heater which was very noisy and recommended we change it. I never thought about buying a larger capacity water heater for our home until the plumber had mentioned it. So not only do I have a new heater but also more hot water. Now the family will be happy :)

Deepak S. March 09, 2012 
Reliable and professional service. ★★★★★
My family and 
I just moved in, my mother was alarmed when the kitchen sink wasn't draining properly. The owner of Comet Plumbing came quickly to check the plumbing under the sink which I knew was old.

Andrew unblocked the clog and installed new pipework beneath the sink. I am very grateful,it was only $99.00 for this great service.


100 S. Murphy Ave.

Ste. 200

Sunnyvale, CA 94086

Tel: 408-502-0932
Fax: 800-805-9025

​Toll Free: 1800-805-9025