Backflow prevention protects the public drinking water system by helping stop contaminated or non-potable water from flowing backward into clean water lines. Backflow prevention assemblies are commonly required on irrigation systems, commercial plumbing systems, fire lines, domestic service lines, and other water connections where a cross-connection risk may exist.

Cross-Connections LLC provides certified backflow testing, documentation, repair support, and filing assistance for homeowners, HOAs, property managers, commercial buildings, and multi-site accounts.

What is backflow?

Backflow is the unwanted reverse flow of water or other substances into the potable water supply. This can happen because of pressure changes, such as a drop in city water pressure or higher pressure on the customer side of the system.

A properly installed and maintained backflow prevention assembly helps protect the public water system.

Why annual testing matters

Many water providers require backflow prevention assemblies to be tested on a regular schedule by a certified backflow tester. Testing confirms that the assembly is operating correctly and that the required report can be submitted to the correct water provider or reporting system.

If you received a backflow notice, do not ignore it. The notice usually includes the water provider, due date, device information, and reporting instructions.

What to send us

To help us schedule and file your test correctly, please send:

• Property address

• Contact name and phone number

• Water provider or district, if known

• Copy of the notice you received

• Due date

• Number of backflow assemblies

• Access instructions

• Any known repair issues or failed-test history

Need help figuring out your setup?

Send us the property address and a copy of your notice. We can help identify the likely water provider, the testing requirements, and the next filing step.

Local water district and backflow resources

Different properties may be served by different water providers, even within the same city or mailing address area. These links are provided as a customer resource. Requirements, deadlines, forms, and reporting systems may change, so always follow the latest notice from your water provider.