1 Backflow Plumbing

These guys are great. They use technology to improve the entire experience, are on time and on schedule. Love these guys.

very good service. thank you!

John came on time, was knowledgable and fair, worked through a rain storm and did work at a fair price. Couldn't be happier.

My water heater was leaking so I called some plumbers that I found online . Most of the plumbers either referred me to an appointment and didn't call me back or told me they couldn't give me a ballpark estimate to
install a standard residential water heater . When I called One Backflow Plumbing , John answered and was very
considerate and professional . He gave me an estimate , came the next day on time and completed the job and some extras quickly and professionally leaving
no mess . I will recommend One Backflow to my friends and family as a
trustworthy contractor .

1 Backflow Plumbing has done our city backflow check for a couple of years now. They make everything very easy from scheduling to reporting.

They took care of the backflow report required by San Francisco and they were quick and timely.

Excellent work .

They do the backflow test for a commercial space every year and we will continue to use them. Great company which is easy to work with.

John is the owner and does the work himself. He installed a new water heater for me. He is very experienced, professional and explained everything thoroughly.

He used to build homes in the past and I picked his brain on a few other projects I am planning around the house - he was happy to help and offered great advice!

John Cook did all the plumbing work in my house in San Francisco. This was a big job consisting of 3 bathrooms and kitchen. During my interview process, John took notes as to what I wanted done. John email the proposal with a full explanation of the work, cost and timing. I had work with many contractors and never had one that fully listen to my demands. The proposal clearly show John paid attention. The icing on the cake was a job well done and completed on time. In fact, there were issues discover during the demo process which would have cost me more money but John took care of them and did not charge me.

Very personable and capable; I was very satisfied.

Experienced, attentive plumbing services! Highly recommend.

Backflow Water Testing

Annual backflow inspection for our boiler. Easy to schedule online, and was done in a jiff.

John is an absolute professional. He went above and beyond the work that I had hired him to do. He is extremely knowledgeable and talented in plumbing, as well as many other aspects of home maintainence, repair and improvement.
I have definitely added him to the short list of trusted tradesmen, of whom I’ll have work on my property again.

Very happy with this company and have used their services for my annual backflow test.

John of 1 Backflow Plumbing has saved us multiple times over the last several years. He is responsive, diligent, honest, and excellent at his work. When you call, he answers the call. Recently, we experienced a horrific plumbing issue in a rainstorm just 2 days before our daughter was coming home for the winter holidays. We were also hosting house guests that week and we were panicked as our showers and toilets were dysfunctional throughout the house. John was there for us immediately. He made sure the problem was properly fixed to our satisfaction and followed up multiple times to make sure all was fine. I highly recommend 1 Backflow Plumbing.

Good service, came prepared and figured out how to unplug 2 interior downspouts three stories up. No BS just hard work! Heads and shoulders above others who had “looked” at the job.