Skip to content

¿Prefiere español? Ver en español

AB’s PlumbingOakland, open 24/7
All services

Need a backflow preventer? We install and replace them.

A backflow preventer lets water flow one way only, so water from sprinklers, irrigation and other equipment can’t flow back into the water you drink. We install new ones and replace old ones that leak.

4.9676 reviews on Yelp
Call (510) 753-8649
Text a photoFree estimate

Hablamos español. Ver en español

New brass backflow valve assembly installed on a copper water line against a white stucco wall
After: the new backflow valve in place

Sound familiar?

  • New sprinkler or irrigation line that needs a backflow preventer
  • Backflow preventer leaking or dripping
  • Cracked or damaged backflow device
  • Remodel or new water line that calls for backflow protection
  • Not sure whether your water line has one

What we do about it

New installs
Backflow preventers on irrigation, sprinkler and other water lines.
Replacements
The leaking or damaged device comes out and a new one goes in.
A price before the work
You hear what’s needed and what it costs before we start. Estimates are free.

Backflow preventers, in our customers’ words

4.9average from 676 reviews on Yelp
Read them all on Yelp (opens in a new tab)
  • “They showed up about an hour after I called and had things completed right away. Fast and efficient service at a reasonable price.”
    Robert W., OaklandToilet reseated,
  • “The job was done cleanly and quickly and Issac was really great about giving helpful advice for next time as well as answering a lot of other questions I had. … Estimates were accurate and totally transparent.”
    Connie B., San FranciscoRepair, plus help with faucet pressure,
  • “I had a weekend emergency and they were at my house in 30 minutes.”
    Mary S., San FranciscoWeekend emergency,
Show 3 more reviews
  • “Called AB's Plumbing Service for a clog flooding out our driveway. They came out within 45min. … Ab, Issac and Omar were very knowledgeable and helpful. They are considerate about pricing.”
    Jeffrey J., OaklandClog flooding the driveway,
  • “They snaked the pipe and cleared out all the grease and oil buildup that was causing the problem. Even better, they took the time to explain how to prevent it from happening again, which I really appreciated. … They wore shoe covers in the house and cleaned up thoroughly afterward.”
    Claude Q., Union CityClogged kitchen sink cleared,
  • “Came out right away, fit me in for work the next day, fixed my standing water under the house problem by digging down through concrete & placing a sump pump then tied it into the sewer line. He and his team were professional, efficient, cleaned up perfectly afterward, all at a good price.”
    Cheryl R., OaklandSump pump for water under the house,

Recent backflow preventers work

  • Old rusted backflow valve assembly taken out and lying on a wet wooden deck beside a garden hose
    Before: an old, rusted backflow valve

How a job goes

Four steps, each one backed by a customer’s own words.

  1. 1

    You call or text

    Day or night. Tell us what’s happening, and send a photo if it helps.

    “They responded on the first call and gave text updates.”
    Jeff J., Hayward, on Yelp
  2. 2

    We find the cause

    We diagnose before we fix. For drains and sewers that can mean a camera down the line, so you see it too.

    “He then ran a camera through the line and showed me exactly what was causing the backup: tree roots had intruded into the sewer pipe.”
    Natalye B., Oakland, on Yelp
  3. 3

    You get the price first

    We explain the fix and what it costs before any work starts. No hidden fees.

    “Estimates were accurate and totally transparent.”
    Connie B., San Francisco, on Yelp
  4. 4

    We fix it and clean up

    Shoe covers on, work area cleaned, and everything tested before we leave.

    “They wore shoe covers in the house and cleaned up thoroughly afterward.”
    Claude Q., Union City, on Yelp

Get a free estimate

Tell us what’s going on and we’ll call you back. If something is flooding or backing up right now, calling is fastest.

How soon do you need us?

We only use your details to answer this request. Privacy policy

Rather talk to someone?

Call (510) 753-8649

Or text us a photo of the problem. Hablamos español.

Email us at contact@abs-plumbingservices.com

New customers get 10% off their first service. Mention the website when you call.

Backflow preventers: questions people ask

What does a backflow preventer do?

It lets water flow one way only, so water from sprinklers, irrigation or other equipment can’t be pulled back into your drinking water.

Can you replace a leaking backflow preventer?

Yes. We take out the old device and install a new one, and give you the price before we start.

Will I know the price before you start?

Yes. We look at the line, explain what it needs and give you a price before any work starts. Estimates are free.

How fast can you get here?

It depends on where you are and what’s going on, but for emergencies we head out right away. Reviewers regularly mention the crew arriving within the hour.

Are you really open 24/7?

Yes. Call any time, including nights and weekends.

Are you licensed and insured?

Yes. AB’s Plumbing is licensed and insured in California.

Other things we fix

See all our services