Certified Backflow Services

Licensed, Bonded, & Insured

Inspection & Repair

Contractor’s License #: 1112846


LeBlanc Backflow Service, is a backflow test and maintenance company based in Moreno Valley, CA since 2012. In 2021 we expanded a second business location in Winchester CA. We cover most of western Riverside county including Riverside, Corona, Eastvale, Jurupa Valley, Moreno Valley, Perris, Gavilan Hills and expanding to Hemet, Winchester, Menifee, Murrieta, and more. Our technicians are certified by the  American Water Works Association and Riverside County as backflow prevention assembly testers.


Aside from our certifications, we are also experts in backflow repair. If your assembly fails its yearly inspection, we can diagnose and make the necessary repairs in order to get your backflow assembly functioning properly and re-certified. 


Testing & Certification

LeBlanc Backflow Service inspects and tests your backflow prevention assembly. We ensure the device is functioning properly and meets local certification standards.

Repair & Replacement

We have the knowledge to repair any assembly, any make, any size. We carry parts for most commonly used sizes and manufacturers and can quickly procure parts that are not cost effective for us to carry in inventory.

Our Mission:

We realize that you have many choices when it comes to choosing a company to perform your annual backflow testing and recertification. Our goal is to make the process as hassle free as possible for you the customer. We provide prompt, courteous, high quality service at highly competitive prices.


We work around your availability. We submit the paperwork to your water provider on your behalf and email copies for your records. We invoice via email and offer the option to pay securely  by credit/debit card. For many customers this means you don’t have to be present while the testing occurs unless you choose to. From the time we start until the job is done, we handle everything so that you don’t have to.



Most frequent questions and answers

A: Water systems are designed to have higher pressure than a customer’s system to keep water flowing in the right direction. However, when there is a drop in water main pressure or if pressure on a customer’s property is greater than the supply system pressure a reverse flow – or backflow – can occur. This can be caused by conditions such as a booster or well pump, pressurized tank or boiler connected to the customer’s system (back pressure) or water main breaks or high demands on the supply system such as fire fighting (back siphonage). A backflow condition can result in water contamination if hazardous cross-connections exist, regardless of all treatment processes.

A:Whenever a plumbing fixture is connected to the drinking water supply, a potential cross-connection exists. If the water on your property is in contact with a harmful substance – such as fertilizer – and that water backflows into the main water system, it could cause illness or, in extreme cases, death. 

A: This is by far the most commonly asked question. The short answer is that your water provider is the best source for this information and the authority that made the determination that it was required. Backflow testing companies do not have any say on whether your property is required to have a backflow preventer and some jurisdiction prevent us from discussing it with the customer in order to avoid confusion. Here are some basics though:

Backflow devices are required by state law where fire or irrigation services are installed. The device prevents back-siphonage and back-pressure into the main water supply, protecting the water supply from cross contamination.

Most multi-family, commercial, and industrial properties as well as properties with an auxiliary water supply and properties with irrigation meters in a water provider’s service area are required to have a backflow device, specifically a Reduced Pressure Assembly backflow device.

If you have questions about why your property specifically is required to have a backflow preventer you should contact your water provider.

A: All installed devices by law must be tested on an annual basis. Each year, customers receive a reminder notice along with a certified list of testers. Failure to have the device tested could result in the termination of service.


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