Backflow Testing
San Francisco, CA

The name says it pretty much: “backflow.” You would probably guess that backflow is not a good thing for you or your plumbing without having a full description in front of you, and it’s not. The plumbing of your home is set up to keep wastewater very separate from your drinking water. We would be your best choice for Backflow testing in San Francisco.

Backflow Testing and Repair in San Francisco

When backflow occurs, a problem has arisen where the wastewater in your plumbing somehow backs up and enters your supply pipes, i.e. your drinking water. There are ways to help prevent backflow, and most plumbing for your property these days requires some sort of backflow prevention service.

Plumbers installing or checking backflow-prevention systems must be certified for backflow according to the Plumbing Industry Commission’s guidelines. They need to understand the appropriate selection, deployment, commissioning and monitoring codes and standards. We at San Francisco Plumbers Prros are fully licensed and certified to prevent and repair backflows.

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We are able to provide professional advice on the suitability for individual premises of specific backflow-prevention devices. We have a full understanding of installers and testers ‘ legal responsibilities.
Household water contamination is avoided by backflow prevention systems. Such devices will prevent polluted fluid from reaching the clean water system if the water pressure in your home suddenly changes. Checking these devices on a routine basis is important to keep them running smoothly. D&G Plumbers provide great backflow testing in San Francisco.

Backflow usually occurs for one of two underlying reasons–either:
• the supply pressure drops due to leakage or failure (back-siphonage)
• the downstream pressure at your premises increases involuntarily (back pressure).

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Back Siphonage

Back-siphonage and back pressure are more likely to occur when a second water system is connected to your water supply–known as a cross-connection. Any company that uses water in its daily business— including hospitals, schools, labs, fisheries, market gardens and nurseries, industrial plants and commercial kitchens — can have a cross-connection, whether deliberately or unintentionally.

The cause may not be apparent if your supply pressure drops; you may not notice anything other than a slight reduction in your taps ‘ water flow. Typical causes are a leaking water main–perhaps due to excavation damage–or a failed supply pump.

Less often, another local user consuming an enormous amount of water can also cause a significant reduction in the distribution demand, particularly from a water main that is not big enough for the job.

Low supply pressure causes water from your premises to be drawn back into the main water pipework in the absence of a backflow-prevention device. If your water pipes, particularly one with a booster pump, are cross-connected to a secondary system, the risk increases.

There are various sources of back pressure. Anything that increases your water pressure is capable of causing back pressure, including secondary water pumps, pressure intensifiers, industrial machinery and laboratory equipment.

Whether you’re doing one of these (or something similar) on your premises, you don’t have to attach it directly to the water main –whether purposely or accidentally. If you do, you will contaminate the supply by pumping water back into the reticulation pipework.

One of the most common causes of back pressure are inadvertent cross-connections. By using a mixture of water and recycled (or gray) water, many industrial processes reduce overall water consumption. There is a cross-connection as reclaimed water is pumped into the processing equipment and is not prevented from entering the water supply of the mains.


Cross-connections is not always obvious. A cross-connection is an actual or potential contact between an infrastructure of water supply and a source of actual or potential contamination or pollution.” Note the words “or potential” –a clear indication that you should always be searching for potential contamination sources.

It is easy to eliminate any unintended cross-connections. Instead of being stowed, flexible hoses left trailing can end up hanging in stormwater, river water or seawater, providing an easy route for pollution to enter the water. Storage tanks with filler pipes that are too long end up under the ground with the mouth of the pipe when the tank is full–a classic back-siphoning course.

Maybe the most avoidable source of cross-connection is the well-intentioned but inept bodge … just because you can’t be tempted to tinker with your plumbing.

It is essential for your health and your family’s health to have sanitary and microbe-free drinking and bathing water. Regular check-ups are the best option to make sure there are no contamination. If you suspect a difference in taste of smell in your water contact us immediately and we will check your water for contamination. Get professional from D&G Plumbers to evaluate your pipework and perform any modifications or extensions to prevent and repair backflow.

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San Francisco
California, USA





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