Professional Service You Can Depend On

Certified Backflow Services provides commercial and residential backflow testing, installation, and repair to the Livermore and nearby area. When working with us you are working with an environmentally friendly company with knowledgeable, certified technicians. We are locally owned and operated nearby Livermore, CA.

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What is Backflow?

Drinking water flows from the source to your tap in pressurized water pipes. Typically it only flows in one direction, although under certain circumstances it can flow in the opposite direction, or “backflow.” This can be caused by things such as a water main break or high demand at a fire hydrant. When backflow occurs, water runs backward through the water system. The water flowing backward often is non-potable and might contaminate the drinking water supply.

What is Backflow Testing?

The majority of backflow assemblies include a check valve or valves and occasionally a relief valve. Each of these mechanical internal components must be tested annually and maintained if necessary. During a backflow test, the assembly is pressurized and then each part is isolated to ensure it is operating at an acceptable level. The check valves must hold a minimum pressure to pass the inspection and the relief valves must open before a certain pressure differential is reached. Repairs must be performed if minimum standards are not met.

Is testing required?

Numerous California state regulations require all backflow prevention devices to be tested annually. These devices are required to keep the water that passes through them and into the plumbing system beyond them from coming back into the water supply, while protecting the quality and safety of the drinking water system. Just like the individual parts of your car, backflow prevention devices have parts that can break down and wear out. Annual backflow tests can help to ensure the drinking water supplied to your home remains safe. If you live in Livermore and your not sure whether your system needs a backflow assembly device or an annual test, contact Certified Backflow Service through our contact form or call us at (209) 683-9245.

What does the annual test consist of?

When we perform an annual test, we first inspect the device externally to make sure everything is in order. Then we use our specialty gauges to perform a variety of tests to isolate different parts of the device, and make sure they are functioning internally up to code.

Do you install and/or replace backflow assemblies?

We do install backflow devices and replace them if needed.

What qualifications does Certified Backflow Services have?

Our backflow assembly testers are certified by the State of California under their cross connection certification program. Our technicians are also nationally certified by the American Backflow Prevention Association. American Water Works Association California-Nevada Association Cert # 17729.

Contact us today – call (209) 683-9245 or email us through the “contact us” link.

backflow preventer near me
backflow preventer near me
backflow preventer near me
backflow preventer near me

  • What is a backflow preventer?

    A backflow preventer is a device installed in the plumbing system that prevents non-potable (not drinkable) water from mixing with clean drinking water. These devices commonly contain a number of valves that ensure that the stagnant and/or polluted water beyond the backflow preventer can never escape.

  • What does a backflow preventer look like and where is it located?

    Backflow preventers come in many shapes and sizes. The three main categories of backflow assemblies are:


    1.) Double Check Backflow Preventers - Double check backflow preventers consist of two check valves, four test ports, and two shut-offs and are commonly found in green rectangular irrigation boxes at ground level. These are also occasionally installed in crawl spaces, garages, and unfinished basements.


    2.) Reduced Pressure Backflow Preventers - Reduced pressure backflow preventers are composed of two check valves, a relief valve assembly, a sensing line, four test ports, and two shut-offs. These are required to be installed above ground – both indoor and outdoor – and sometimes in insulated hot boxes.


    3.) Pressure Vacuum Breaker or Spill Resistant Pressure Vacuum Breakers - Pressure vacuum breakers consist of a single check valve, an air inlet, two test ports, and two shut-offs. These devices are required to be installed above grade, and are almost exclusively found outdoors.

  • What is backflow prevention service?

    Backflow prevention service and inspection is vital to maintaining the quality of drinking water. The backflow preventer at your home or place of business is the only thing standing between your clean drinking water and potentially contaminated or stagnant water in auxiliary systems (such as irrigation systems, fire suppression systems, wells, pools, hot tubs, and boilers)


    It is crucial that backflow devices are inspected on a regular basis and receive maintenance as necessary. The state of Oregon requires that each backflow preventer be inspected and pass inspection at least once per year. Your water provider is legally required to enforce this legislation and maintain a high level of compliance throughout their district.


    We offer backflow prevention services in:


    • Galt
    • Acampo
    • Lodi
    • Stockton
    • Linden
    • Lathrop
    • Manteca
    • Modesto
    • Tracy
    • Livermore

    If you would like to know more about backflow prevention service, please contact us at (209) 683-9245 with any additional questions.

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