1 Backflow Plumbing
Company Overview
Don't ignore a leak. When water begins to accumulate, it's crucial to respond quickly by getting in touch with the best plumbers in San Francisco. Whether you have a dripping faucet, or backflow prevention testing, our skilled team is ready to assist. We handle everything from installations to repairs, we fix challenges that others shy away from, while keeping you updated every step of the way. Through innovative technology and skill, we find and fix problems quickly and reliably. Should your home sink start leaking, we're committed to going above and beyond.
Business Services
- Drain installation
- Drain repair
- Gas line installation
- Gas line repair
- Hot water recirculation pump installation
- Hot water recirculation pump repair
- Plumbing inspection
- Plumbing installation or replacement
- Plumbing repair
- Sewer installation
- Sewer repair
- Water heater installation
- Water heater repair
- Water pipe installation
- Water pipe repair
Business Location & Hours
Mon: | 7:00 AM - 7:00 PM |
Tue: | 7:00 AM - 7:00 PM |
Wed: | 7:00 AM - 7:00 PM |
Thu: | 7:00 AM - 7:00 PM |
Fri: | 7:00 AM - 7:00 PM |
Sat: | Closed |
Sun: | Closed |
Recommended Customer Reviews

hot water heater wasn't working right. received fast service. very knowledgeable. problem solved. would highly recommend

Great service, Quality and Professional work. Major League of plumbing.
Thanks, John.

We talked to John about a potential (and expensive) Backflow Prevention installation. Right away he seemed very interested in understanding our unique problem. He even provided a work around solution to our problem which would end up saving us from extensive work. I appreciated his honesty and creativity in helping us with our situation. John is very knowledgeable and we're so happy to have found him.

I was in a bind and needed someone to replace our broken kitchen faucet ASAP. I called John and he was at our place within 15 minutes. His price was quite reasonable and fair, but most importantly, he fixed and replaced the faucet that day. He didn't charge me ""extra"" even though he knew I was in a bind and it was late in the afternoon.
He also noticed that the dishwasher was installed improperly and he fixed that too--at no extra charge! I highly recommend John for all your plumbing needs. I believe he's also a licensed electrician so he can help on that end too!

John of 1 Backflow Plumbing has saved us many times over the last few years. He is responsive, diligent, honest, hard working, and very good at his job. John goes the extra mile to make things right. When we call John, he answers.
Over the holidays we were hit with a terrible plumbing problem that knocked out our sewer line, toilets, and showers.
It came at an awful time as we were days away from hosting family members. We were desperate.
John came to the rescue once again. He promptly assessed the problem and fixed it expeditiously and properly over the next few days in a total downpour.
This allowed us to honor the invitation to our house guests. Otherwise, they would have been forced to stay in a hotel and incur unexpected costs and it would have truly ruined the holiday season for all of us.
Thanks again John.

PG&E told me one of our gas lines was rusting and needed to be replaced. I contacted John and he came right out to survey the situation. He came back a couple of days later and did a complete pressure check on the line, replaced the the rusting pipe and an additional section that had a rust issue. He did a workman like job at a competitive price. I would not hesitate to hire him again or recommend him to anyone who sought a reference.