Backflow Testing, Repair, and Installation

CMS Plumbing is fully certified to perform backflow prevention testing, repair, and installation for all sizes and types of systems. Our team ensures that your property’s water supply remains safe, compliant, and protected from contamination.
A backflow prevention device is essential for keeping clean water separate from potential pollutants that can flow backward into the public water system due to pressure changes. Without proper prevention, harmful substances—such as chemicals, fertilizers, or bacteria—can enter the potable water supply, posing serious health risks.

To maintain safety and comply with local regulations, annual backflow testing is required. CMS Plumbing provides professional testing services to verify that your device is functioning correctly and meets all code requirements. If repairs or replacements are needed, our licensed technicians handle everything quickly and efficiently.
We also supply and install protective cages and enclosures to safeguard backflow assemblies from vandalism, theft, and environmental damage, extending the life of your system.

With CMS Plumbing, you can rely on expert service, certified technicians, and a commitment to water safety and compliance for both commercial and residential properties.
Top-Rated plumbers
In the Bay Area
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Free & Detailed Estimates ProvidedWe offer upfront quotes before we get to work.
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Emergency After-Hour ServiceWhen you need plumbing fast, don't hesitate to call!
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Over 40 Years of ExperienceWe take pride in being experts at all things plumbing.
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We Get the Job Done Right the First TimeExceeding your expectations is our #1 goal.
We Let out customers do the talking
Hear Their Thoughts on CMS Plumbing!
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"Timelines were met, and the quality of the work has been superb."Timelines were met, and the quality of the work has been superb.- Chris P.
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"He was an excellent representative of your company!"Today Luis S. came to fix a leak in my bathroom. He was very professional and did a wonderful job! He left the bathroom clean and was polite. He wore shoe covers and kept his work area tidy. I would highly recommend Luis S. for any plumbing work you may need. He was an excellent representative of your company!- Victoria C.
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"Really reliable and great service from Sam"Sam came in to our home with a great attitude and was well knowledgeable about the repairs in an emergency he came through thank you Sam- Mgarcia
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"“How may I help you?” and he means it!!!!"Sam is an excellent serviceperson! A+++ in all aspects!. He is knowledgeable, thorough, efficient, friendly, trustworthy and he listened to my concerns!! He genuinely wanted to understand and to take of my plumbing issues from my stopped up drain with raw spinach in it to clearing my pipe. As an older person, I feel comfortable having him come to take care of any & all of my plumbing needs in the future! I will be asking for Sam specifically next time I need a plumber. Thanks, Sam!- Sam