A cross connection is a point where drinking water can accidentally come into contact with water that isn’t safe to drink. This can happen when a hose, pipe, or plumbing fixture connects your clean water supply to something that could be contaminated, such as a bucket, pool, or chemical sprayer.

If water flows the wrong way (called backflow), chemicals, dirt, or bacteria can get into your drinking water. This can make people sick.

Backflow occurs when water flows in the opposite direction and can allow contaminants to enter the drinking water system. Backflow prevention assemblies and regular testing protect public health and keep facilities compliant with local and state regulations.

BACK SIPHONAGE

Back siphonage occurs when there is a negative pressure (a vacuum) in the water supply system, causing water to flow backward from a non-potable source into the potable water system. This can happen during events like a water main break or when a large amount of water is suddenly drawn from the system (e.g., firefighting). Essentially, the pressure drop “sucks” contaminants back into the drinking water supply.

BACK PRESSURE

Back pressure happens when the pressure in a non-potable system becomes greater than the pressure in the potable water system, forcing water to flow in the opposite direction. This can occur when pumps, boilers, or elevated tanks create higher pressure than the supply line, pushing potentially contaminated water back into the drinking water system.

Why testing matters: It verifies your backflow prevention assembly is functioning properly and safeguards the public water system.

How often to test: All backflow prevention assemblies require annual testing. Some assemblies may require more frequent checks depending on use and risk level.

Backflow Testing Notices: If you have a backflow prevention device, you’ll receive a notice and test form from BWP in the mail before your test is due. Notices are sent one month before your compliance month.

For example, if your backflow test is due on February 28, 2026, your notice will arrive in January 2026.

Select a Backflow Tester

Backflow prevention device testing must be performed by an American Water Works Association (AWWA) certified tester. Below is a list of AWWA-certified backflow testers authorized to operate in the City of Burbank. Homeowners and businesses may select any tester from this list to complete the required testing.

Please note: The list of AWWA-certified backflow testers is provided as a public resource, and BWP makes no guarantees or representations, and assumes no responsibility or liability, as to the quality of work performed by these contractors.

Effective July 1, 2026, the State Water Resources Control Board will require certification for meter protection backflow testers through a recognized provider. LA County Public Health's certification will no longer be valid for this purpose, but will remain valid for internal backflow assemblies.

When selecting a backflow tester before July 1, 2026, please verify that the tester is AWWA-certified or LA County-certified. Effective July 1, 2026, we will only be accepting backflow tests from AWWA-certified testers.