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Backflow Testing, Repair and Replacement in San Francisco, CA
Keeping Your Certification Current and Your Water Safe
Every backflow prevention assembly in San Francisco has to be tested immediately after installation and at least once every year afterward, and only a tester permitted by the Department of Public Health can perform that test. Missing that deadline can bring fines, termination of water service, or both, and reinstatement is never quick. Malcolm Plumbing & Mechanical tests, repairs, and replaces assemblies on boilers, irrigation systems, fire lines, and tall buildings throughout San Francisco, CA and neighboring communities.
A test result is only useful when someone handles everything that follows it. We submit the report, rebuild failing check valves and relief openings on site wherever parts allow, and replace assemblies that no longer hold pressure under test conditions. Our team is licensed and insured with 35+ years behind it, estimates are free, and labor carries a one-year warranty. Send your assembly details through our contact page and we will schedule the visit around your operating hours.
Backflow Services We Provide
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Annual Assembly Testing and Certification
Each assembly gets tested against the required differential readings, and the results go to the water department on the correct form within the reporting window. You receive a copy for your own records and a reminder before next year's deadline arrives.
Reduced Pressure Zone Assembly Service
RPZ units protect against the highest hazard categories and carry a relief valve that must vent reliably. We service the first and second checks, the relief mechanism, and the seat surfaces that determine whether the assembly passes or discharges continuously.
Double Check Valve Assembly Service
Double check assemblies guard lower hazard connections such as fire lines and certain irrigation arrangements. Two independently loaded checks have to close tightly, so we rebuild worn discs, springs, and seats rather than simply reporting a failure and leaving.
Backflow Assembly Repair and Rebuild
Most failures come down to debris on a seat, a hardened rubber disc, or a tired spring. Carrying common rebuild kits means a great many assemblies get corrected and retested during the same visit instead of waiting weeks.
Assembly Replacement and Upsizing
Bodies that have corroded through, obsolete models with no available parts, and assemblies undersized for current demand all need replacing. New units get installed at the required clearances and elevation, then tested and certified before we consider the job finished.
New Installation and Cross-Connection Survey
Boilers, chemical feed equipment, dedicated irrigation, interconnected fire sprinklers, and buildings above four stories all create hazards requiring protection. A survey identifies every connection needing an assembly and the hazard class that determines which device belongs at that particular point.
See Our Backflow Work
See how Malcolm Plumbing & Mechanical handles backflow testing, repairs, and replacements to keep your water system safe and compliant in San Francisco, CA.
FAQ's
How often does a backflow preventer need to be tested?
Annual testing is the standard requirement, along with an initial test right after installation and another after any repair or relocation. Some higher hazard connections and certain commercial accounts are placed on a more frequent schedule by the water department.
What is the difference between an RPZ and a double check assembly?
An RPZ carries a relief valve between two checks and vents to atmosphere if either check fails, which suits high hazard connections. A double check relies on two checks alone and is approved only for lower hazard applications.
What happens if my backflow assembly fails the test?
The assembly has to be repaired or replaced and retested before certification can be issued. Most failures come from debris or worn rubber and are corrected quickly. Malcolm Plumbing & Mechanical carries rebuild parts throughout San Francisco, CA.
Which properties are required to have backflow prevention?
Connections that create a cross-connection hazard: boilers, chemical injection, dedicated irrigation lines, interconnected fire sprinkler systems, buildings of four or more stories, and supplies elevated well above the meter. Requirements are set by the hazard involved, not building type.
Why is my RPZ discharging water from the relief valve?
Continuous discharge means the first check is not holding, usually because debris is caught on the seat or the rubber has hardened. Occasional spitting during pressure fluctuation is normal. Steady flow needs attention before the assembly fails its next test.
Can a backflow assembly be repaired or does it need replacing?
Repair is usually possible and considerably cheaper, since manufacturers supply rebuild kits for most current models. Replacement becomes necessary when the body has corroded, the model is discontinued without parts, or the assembly is undersized for present demand.
Does the water need to be shut off during a backflow test?
Yes, briefly. The test isolates the assembly, so anything downstream loses supply for roughly 15 to 30 minutes depending on the device. Scheduling outside peak hours keeps that brief interruption from affecting tenants, customers, or production in any noticeable way.
Where should a backflow assembly be installed?
As close to the point of connection as practical, above grade, with clearance around the test cocks for servicing and protection from vehicle damage. Malcolm Plumbing & Mechanical has been siting assemblies across San Francisco, CA for 35+ years.
Why Choose Us for Backflow Testing, Repair and Replacement
Reports Filed, Not Just Handed Over
A completed test that never reaches the water department protects nobody. Submission is part of the service here, so your compliance record updates without you chasing paperwork or discovering an awkward gap during a property transaction several years later.
Repairs Done on the Same Visit
Failing an assembly usually means booking a second appointment and losing another window of water service. Arriving with rebuild kits on the truck lets most repairs happen immediately, so the assembly is corrected, retested, and certified in one visit.
Testing Timed to Your Deadline
Certification dates are easy to lose track of across a portfolio of buildings. We track them for you and schedule ahead of expiry, which keeps you clear of enforcement letters and the expensive scramble that usually follows one.
Minimal Interruption to Water Service
Testing requires the supply to be closed briefly, which matters a great deal in a restaurant, clinic, or apartment building. Work gets scheduled around your operating hours and the shutdown itself is kept as short as the procedure allows.
Straight Answers on Repair or Replace
Rebuilding is usually the sensible option and we will say so. When a body is corroded through or parts are genuinely obsolete, you get told directly rather than paying twice for a repair that was never going to hold.
Records You Can Retrieve Later
Test reports, repair notes, and serial numbers stay on file and are available whenever a lender, buyer, or inspector asks. Reconstructing a compliance history from memory is genuinely unpleasant, and it is entirely avoidable with decent record keeping.
Compliance Without the Annual Scramble
Backflow certification is one of those obligations that sits quietly in the background until a letter arrives threatening the water supply, and by then the deadline has usually passed. It does not need to work that way. Malcolm Plumbing & Mechanical tracks renewal dates, tests on schedule, repairs on the spot where parts allow, and files the reports for buildings across San Francisco, CA, which reduces the whole obligation to answering one scheduling email a year and nothing more. If your assemblies are due, overdue, or you are simply unsure, our contact page is the place to sort it out.
Why Choose Us
24/7 Emergency Plumbing
We provide 24-hour emergency plumbing services to help customers address urgent plumbing problems quickly. Our team is ready to respond when unexpected issues arise.
Comprehensive Plumbing Services
We handle a wide range of plumbing and mechanical needs, from sewer stoppages and hydro jetting to water heaters, boilers, fixtures, and general plumbing repairs. This allows us to provide convenient solutions for many different projects.
Experienced Sewer Solutions
We specialize in sewer camera inspections, pipe location, hydro jetting, stoppage removal, and sewer replacement. Our detailed approach helps us identify plumbing problems and determine the right solution.
Reliable Service & Repairs
We take pride in providing dependable workmanship and practical solutions for residential and commercial customers throughout San Francisco and surrounding areas. From water leaks and backflow systems to boilers and sewage ejectors, we are committed to getting the job done right.
Areas We Serve
San Francisco, CA
San Jose, CA
Oakland, CA
Fremont, CA
Hayward, CA
Sunnyvale, CA
Santa Clara, CA
Vallejo, CA
Concord, CA
Berkeley, CA
Richmond, CA
Antioch, CA
San Mateo, CA
Daly City, CA
San Leandro, CA
Redwood City, CA
Mountain View, CA
San Ramon, CA
Dublin, CA
Alameda, CA