Drain + Sewers

Backflow Preventer

Our backflow preventer keeps things on track with style!

Keep Your Plumbing Flowing In The Right Direction

Backflow Preventer Installation

Backflow is when used water flows back into the water supply. This contamination can be harmful to your home and its plumbing, drains and sewer systems, leaving it vulnerable to leaks and corrosion. Most importantly, however, a contaminated water supply could be dangerous to your health. That’s why it’s crucial to utilize backflow repair and replacement services.

Gotelli Plumbing offers backflow services to identify where your plumbing systems are dealing with backflow problems. Once we locate the problem, our expert backflow repair and replacement services will get your system back in shape! Give us a call to get started.

a backflow preventer system installed in the grass outside

What Is Backflow?

Simply put, backflow occurs when the conditions of the water system cause water to flow in the wrong direction, back into the plumbing systems rather than out of it.

There are two kinds of backflow: back-pressure and back-siphonage.

Back-pressure occurs when water is forced to flow in the opposite direction due to pressure downstream increasing the system pressure.

Back-siphonage occurs when a sudden drop in pressure causes the suction of used or contaminated water back into the water supply.

For example, let’s say a homeowner uses pesticides in their lawn, then waters the yard and water pools around a sprinkler head. Then the fire hydrant down the street is used, causing a sudden drop in water pressure. The water around the sprinkler head can be sucked back into the potable (public) water supply, contaminating the community’s drinking water supply.

Backflow Preventer Installation In Marin and Sonoma Counties

In order to stop used water from reentering your plumbing, a backflow preventer can be installed on your home’s pipes. It prevents water from being siphoned or forced back into the potable water supply.

3 Types Of Backflow Preventers

There are several different types of backflow preventers, ranging in design, cost, reliability and more. Understanding each kind of backflow preventer is important if you’re looking to have one installed in your home. While your plumber will help you determine which of these options is best for you, the final decision is yours.

Pressure Vacuum Breaker Assemblies

The most commonly used assembly is the pressure vacuum breaker, which has the simplest design — making it easy to install, maintain and repair. This assembly prevents back-siphonage only, not back-pressure.

Reduced Pressure Zone Assemblies (RPZ)

RPZs are the most complex and expensive backflow preventers but, when functioning properly, are the most reliable. This type of backflow preventer can be installed either above or below ground, although above-ground is preferred, and protects against both back-siphonage and back-pressure.

Double-Check Valve Assemblies (DCA)

Double-check valve assemblies are the best option for underground or indoor installations. DCAs are the most commonly approved underground backflow preventer, although they can also be installed above ground depending on the installation code for your area.

Count On Gotelli Plumbing

Many homeowners aren’t sure if they need or already have a backflow preventer in their plumbing system — that’s okay, we can help! Whether you need a backflow preventer, repair or replacement — or simply aren’t sure — give Gotelli Plumbing a call.

We’ve been operating in the North Bay area for over 30 years, so we know a thing or two about the backflow needs of our customers. One of our experienced, professional plumbers will inspect your plumbing and help you determine the best course of action.

Contact us today to speak to a service representative or to begin a service request.

Other Services We Offer
Gotelli Plumbing Company
Based on 719 reviews
review us on
Extremely dependable. Gotelli have helped me in all kinds of different plumbing situations. They get to me quickly for emergencies and offer great service and advice. Highly recommend.
Gotelli Plumbing
Based on 719 reviews
review us on
Extremely dependable. Gotelli have helped me in all kinds of different plumbing situations. They get to me quickly for emergencies and offer great service and advice. Highly recommend.
5 StarsJason is the definition of a plumbing professional. He arrived on time, wore booties in the house without being asked, explained the work he would do, prepared an estimate, and completed the job without creating a mess. He also recommended future upgrades. Jason is friendly, confident, and polite. Highly recommend!
Joey came out after we had a gas leak. He found the issue problem solved and in less than 48 hrs our gas was back on with new pipes. We also had him replace 2 original toilets from the 60's and install a new water heater. Excellent service, fast, professional. Best call we ever made.
Excellent communication and service. We will recommend and be back when the time comes!
Donte was conscientious and friendly. It was great working with him.
Very satisfied with Gotelli Plumbing. Steve did a great job for us.
Fernando Lara did a beautiful, clean and very efficient job on our clogged kitchen sink. He was explained everything beautifully! Thanks a million, Fernando for your excellent expertise and a great job! We appreciate it!
I’ve used Gotelli Plumbing for the last 7 years, addressing the full range of issues that affect a house. Recently, Steve and Sebastian installed a Halo 5 water filtration system. The work was done to the highest standard and we all are very pleased with the resulting water taste and clarity. I can happily recommend Gotelli for all plumbing needs.
Prompt, friendly, kind, reasonable. My go-to plumbers!
Joey replaced a 1954 toilet, yes, a 1954 toilet, and old, corroded shower head assembly with new, high quality products. The upgrades are the best ever!
Dante is fantastic. Professional, knows his stuff and always a joy to work with. Thx
Joey was great as always and is the only plumber we ask for.
Response from the owner: Thank you, Joseph, for the fantastic review! We are thrilled to hear Joey continues to meet your expectations. Your trust in Gotelli Plumbing Company means everything to us!
Very pleased with Gotelli Plumbing and Steve's work. He made recommendations and provided a very objective analysis of the situation.
Response from the owner: Thank you, Michael, for the wonderful review and kind words! We look forward to serving you again at Gotelli Plumbing!
Tom was the BEST.He knew exactly what needed to be done for all of my repairs. Total of 5 repairs.He explained jobs in detail, gave options, patient, kind and thorough and great positive attitude and energy.Thank you 😊
Response from the owner: Thank you, Lisa, for the fantastic review! We're thrilled to hear about your positive experience with Tom. We look forward to serving you again at Gotelli Plumbing! 😊
Fernando came quickly and was able to fix my lack of hot water situation the same day. He did a great job. Only minor negative is that I felt a sales push to replace both the hot water tank and my existing toilet (which is sketchy periodically) with very expensive products. A bit of a hard sale which is not in my budget.
Great service. On time, respectful, thorough, efficient. Would highly recommend.
Response from the owner: Thank you for the fantastic review, Paul! Your recommendation means a lot to us. We look forward to serving you again at Gotelli Plumbing Company!
Quick response with schedule, on time, great service
Response from the owner: Thank you for the fantastic review, Leslie! Your satisfaction is our top priority at Gotelli Plumbing Company, and we look forward to serving you again in the future!
Gotelli has such great service! Was able to make an appointment for early Monday morning by their phone service over 4th of July.Dante was kind, prompt, great job!!!!
Response from the owner: Thanks, Katie! We're glad that Steve was able to provide you with some of our famous 5-star service!
Steve was great!!
Response from the owner: Thank you, Rita, for the fantastic review! We're thrilled to hear that Steve made such a great impression. We look forward to assisting you with any plumbing needs in the future!
Easy to make appt, on time & very professional.
Response from the owner: We love to hear this, Angela! This is exactly the type of service we strive for here at Gotelli. Thank you for the five stars!
Santa Rosa, CA
3200 Dutton Avenue, #423
Santa Rosa, CA 95407
San Rafael, CA
21 Lovell Ave
San Rafael, CA 94901