Analyzing 7,203,8127.2M ReviewsFor 20,40220.4K Experts
Customers frequently cite punctuality, efficient online booking, and clear communication as key aspects of their experience with annual backflow testing and related plumbing repairs. Reviewers note that technicians often provide educational insights into home maintenance and offer reasonably priced services. One recurring criticism involves a failed inspection where a minor adjustment was required, prompting the customer to seek a second opinion from a different provider who resolved the issue without charge.
Data from Google, last updated October 29, 2026.
Score per factor (100 = best)Each factor is scored 0–100 on absolute terms (star average, share of 1–2★ reviews, price verdicts…); standing within the category can only raise it, never lower it.. Strongest: momentum and craft & service; weakest: reliability.
Bar = this company · dark tick = category median.
159 Google reviews we collected
Phrases our text analysis found in 95 written reviews
Price verdicts customers left with their Google review
Middle half of what 22 customers paid ($78–$329) · gold mark = category median.
How often each topic comes up in the written reviews
We read 95 written reviews and marked every phrase about these topics. The same colors are highlighted in the reviews.
“They are responsive, and so helpful in explaining what was needed with consideration to current work and keeping my home maintained.”
“Responsive when needed, professional, explained work before, during and after job.”
“John performed our annual backflow preventer test and it was a great experience.”
“John is the most capable and dependable plumber I know.”
“Very detailed in their work and made sure to explain every step of the process.”
“…they’re just gonna file with the city that it’s done but anyway I can recommend them…”
“John came on time, was knowledgable and fair, worked through a rain storm and did work at a fair price.”
praise complaint · found by our text analysis, Google review wording unchanged.
Customers hired 1 Backflow Plumbing for 6 kinds of job. Pick one to see what they paid and said.
Hired for annual backflow prevention testing. He gave us some other suggestions for maintenance of our set-up since we just purchased the house. Easy to book online. He came on-time and the process was seamless. Would hire again.
As always, 1 Backflow Plumbing was a tremendous help with plumbing and Backflow services at my home. They are responsive, and so helpful in explaining what was needed with consideration to current work and keeping my home maintained.
Super easy to work with, professional and prompt. Couldn't ask for better service.
Performed a backflow test and replace neutralizing pellets for our boilers. They arrived early and completed the work very fast.
John performed our annual backflow preventer test and it was a great experience. Scheduling and payment was both online and easy.
The owner of this company came over to my house to do an annual inspection and failed my water heater system for the heating of the house. Nothing had changed over the last year and a year prior it passed without a problem. I had to hire another company to come out inspect and they passed after a minor adjustment.…
| Job | Reviews | Category typical |
|---|---|---|
| Water heater installation | 4 | $1.2k–$2.5k |
| Water heater repair | 4 | $114–$680 |
| Toilet repair | 3 | $124–$554 |
| Plumbing pipe repair | 2 | $251–$1.4k |
| Faucet installation | 2 | $261–$680 |
| Drain cleaning | 2 | $57–$393 |
5.0 ★★★★★ 159 reviews on Google · rating breakdown
Reviews from Google, shown as published (original wording, unedited).
fast reliable service would definitely recommend. Backflow tested
Thank you for the Best backflow testing review in San Francisco. We look forward to seeing you next year.
Hired for annual backflow prevention testing. He gave us some other suggestions for maintenance of our set-up since we just purchased the house. Easy to book online. He came on-time and the process was seamless. Would hire again.
Thank you so much Shannon for the best backflow testing review in San Francisco. I appreciate your business.
So quick, professional and reasonably priced!
Happy to help Amanda. Thank you for the excellent review.
As always, 1 Backflow Plumbing was a tremendous help with plumbing and Backflow services at my home. They are responsive, and so helpful in explaining what was needed with consideration to current work and keeping my home maintained.
Thank you, Karen for the Best plumbing review in Menlo Park. we look forward to servicing your Plumbing needs in the future.
on time professional backflow assessment Excellent service
William, it's great we had the chance to help! We're here for you if you need anything. -John C., Owner
Super easy to work with, professional and prompt. Couldn't ask for better service.
Thank you for the kind words and stellar review Amanda.
Performed a backflow test and replace neutralizing pellets for our boilers. They arrived early and completed the work very fast.
Thank you Ivan for the kind words. It’s great to be able to troubleshoot small, quirky things like the check valve to the recirculation line and come up with a more permanent solution. I hope this last for a long time Like it has for my other customers.
Always performs excellent work
Thank you so much for the Best backflow testing review in San Francisco. We appreciate your business. I look forward to servicing you in the future.
great service as usual.
Thank you Mark for the feedback and once again choosing 1backflow Plumbing.
This was awesome! Very detailed in their work and made sure to explain every step of the process.
Kenny is a pleasure doing business with you and your company thank you for the best backflow plumbing review in San Francisco. We look forward to servicing you next year.
Analyzing 7,203,8127.2M ReviewsFor 20,40220.4K Experts
