Tag Archives: backflow

My Water, Wastewater

What is a Backflow Prevention Assembly? Why does my house have a backflow preventer?

As we move into the summer months, it’s good to know how different aspects of your yard and lawn maintenance can impact our water system.

A photo of the backflow prevention assembly cover and a photo of the assembly with the cover behind the assembly

If your home has an irrigation system, it is required to also have a backflow prevention assembly. A backflow prevention assembly is typically part of an irrigation system or commercial property.

This is an important step to protect the drinking water supply in your neighborhood. A backflow prevention device ​prevents hazardous substances (i.e. chemicals used for lawn improvement or soil borne bacteria and parasites) from inadvertently being drawn into the drinking water system and contaminating it. 

If you have any questions or if we can assist you, please call 311 or 704-336-7600. Thank you for your cooperation.

Commonly Asked Backflow Questions

Why did I receive a letter about backflow prevention testing with information for a testing company?

If you received a letter from Charlotte Water about a backflow prevention assembly test, it is because our records show that your backflow prevention device needs to be tested soon. Approved testers send their results to CLTWater and the letter is generated based on when the next reminder is due. Please have your backflow prevention device tested annually to reduce the risk water quality concerns.

How often do I need to have my backflow tested?

Annually. A list of approved testers is listed on our website.

How do I know when is my backflow test due?

It is due the same time each year unless a deferment is granted. We check the last time it was tested and provide that information in the annual “Test Letter.” We can provide that to the customer by phone.

Is backflow testing performed by Charlotte Water?

Charlotte Water only performs an initial installation inspection and any follow-up required. It is the responsibility of the water customer to get the backflow assembly tested. For a list of approved testers, please see a list on our website.

How much does a test cost?

Charlotte Water does not set pricing for backflow assembly testing. Customers need to ask individual vendors what their charge is for testing their backflow assembly.

My residential irrigation system backflow is due for testing in December, can I delay testing until the spring?

Yes, please contact Charlotte Water for a deferment on the testing date. We recommend you have your assembly tested in the spring once the irrigation system is reactivated following winterization.

I have a backflow and so does my neighbor, however, my neighbor has never received a testing notification letter, why?

Your neighbor installer may have not contacted Charlotte Water about the installation of the irrigation system.

Where is my backflow?

It is the responsibility of the water customer to know the location of the backflow prevention assembly for their water system. Charlotte Water has locations based on initial inspection details.

My backflow needs repairs, do I need to hire a licensed plumber to make the repairs?

Yes, a licensed plumber is required per the N.C. Plumbing Board. You should hire a licensed plumber or professional who has expertise in repairing backflows. 

What is the difference between a backflow inspection and a backflow test?

A backflow inspection is an onsite visit by a Charlotte Water Backflow Inspector, making sure the assembly is installed properly.  A backflow test is to make sure the assembly with working properly. Charlotte Water does not perform backflow tests for its customers.

I understand backflows are for high hazard facilities such has hospitals and mortuaries, however, why do I need one on my residential irrigation system?

Irrigation systems can encounter contact with fertilizer, pesticides, and feces, which are high hazards.  A Reduced Pressure Principle Assembly (RP) backflow is used for high hazards.

I have a double check valve assembly (DCVA) backflow that needs replacing for my lawn irrigation system, can I replace it with another DCVA?

No, per Charlotte Water ordinance, the correct backflow preventer for irrigation must now be an RP(Reduced Pressure Principle Assembly). This applies to new installation and replacing a backflow on an irrigation system.

My irrigation system is no longer in use, do I have to test it?

Annual testing is still required until a licensed plumber has capped off your water service at the connection and removed the backflow prevention assembly. An inspection by a Charlotte Water Backflow inspector is required.

Installation Questions and Answers

Do I need a plumbing permit when installing a backflow?

Yes, please contact the Mecklenburg County Code Enforcement at (980)314-2633, You will also need to complete a backflow service application.

Do I qualify for a branch of my irrigation system from my domestic service without a separate water meter?

The Plat date determines if you qualify. The property must be platted prior to 2009. Research and provide the information with the Meter Deferment application.

Where do I send the Backflow Service Application? What is the fee for a new irrigation meter?

Please send backflow/meter applications and fees to:

Charlotte Water

C/O (NAME OF DEPT)

5100 Brookshire Blvd,

Charlotte, NC 28216.

Please contact New Services at (704)336-7600 for any questions regarding fees for water taps and meters.

I have a building project under construction and just had my backflow tested, however, I still have a project hold, did I do something wrong?

You need to contact the backflow inspections department at (704)391-5188 and see if there are additional holds for a backflow inspection.  Inspector needs to ensure the installation of the backflow. Ten days after the backflow inspection the backflow assembly needs to be tested by a Charlotte Water Backflow Approved Tester.

The meter and backflow were installed, and the installer left the meter cover open, so I wanted to know do we close it or is somebody else coming back to close it?

Please call the backflow inspection department for the inspector needs to ensure the installation of the backflow.

Behind the Scenes, Employee Spotlights

Engineering Week Spotlight: Mark Bullins, Environmental Compliance Manager – Backflow Prevention

Mark Bullins, Environmental Compliance Manager, shares his insights with us for Engineering Week on his work with Backflow Prevention (aka Cross-Connection Control).

I have been involved in Backflow Prevention, also known as Cross Connection Control, for over twenty years. As anyone who knows me will tell you, it is a subject I am passionate about. In my past employment, I have dealt with incidents of contamination from unprotected or illicit cross-connections and the consequences to a city’s water supply as well as the water customer. Doing my best to make sure that the drinking water Charlotte Water delivers to its customers remains pure and safe is my highest priority.

Fixed air gap on a tanker fill pipe

As the Environmental Compliance Manager for the Backflow Group, I oversee a team that reviews construction plans and inspects installations, making sure that water connections are properly protected with the correct backflow prevention assemblies and that they are being installed correctly for testing and maintenance. This group also creates and keeps records of these assemblies, their locations, the type, model, serial numbers, test reports, and approved testers; all the items required for compliance. They also handle questions from testers and contractors.

Putting it simply, once the treated water is delivered to the customer through the water meter, we do not want it to flow back into Charlotte Water’s distribution system. For example, for some water services such as a below-ground lawn irrigation system, the water can come into contact with anything found in or on the soil. This may include fertilizers, pesticides, microorganisms…etc. Fire sprinkler systems are another example; they sometimes contain water that can sit stagnant for up to a year at a time. Some fire protection systems also contain toxic chemical additives such as suppressant foam or antifreeze or have the ability for chemicals to be pumped into them. These are only a few examples of why the public water supply needs to be protected.

Parallel backflow prevention assembles an inside installation

Another part of Charlotte Water’s Backflow Prevention program exists in the Customer Service division. This is where the water tanker and hydrant use program is located. The Customer Service group also handles calls from customers, enrolls customers in our Water Smart program, and issues letters for testing for existing customers. Backflow prevention assemblies per city ordinance must be tested annually. With their online portal, backflow testers can submit test results electronically with final acceptance by Charlotte Water. 

Reduced pressure principle assembly with heat tape

People are often confused about what backflow prevention is, and seem to think it is about the “backwater” devices that prevent sewage from coming into a home or business. Many people do not realize that pressurized water from the distribution system can flow in a reverse direction from the water customer or how it can occur. Part of our responsibility is to educate others on the work we do.

Running a backflow prevention program is always challenging and never boring. I enjoy working at Charlotte Water and enjoy the professionalism of the people I work with.