Cross-Connection & Backflow Control Program

To keep your drinking water safe, the City’s Cross-Connection specialist diligently checks the plans of each new business for compliance with cross-connection/backflow requirements. When a property is renovated, a backflow assembly may be required. Per the City’s Municipal Code, each unit must be tested annually at the expense of the owner.

What is a Cross-Connection?

A cross-connection is any connection between your drinking water and any other source of water that combines the two when a backflow condition occurs; typically resulting in contamination of the water system.

What Is a Backflow?

Backflow occurs when the water in your pipes (after the water meter, in your building/facility) goes backward (opposite its normal direction). There are two situations that can cause the water to go backward (backflow):

  • Backpressure: When the pressure in your pipes is greater than the pressure coming in.
  • Back-siphonage: When there is a reduction of pressure in the water distribution system.

All backflow prevention assemblies are to be tested annually at the owner’s expense (Ceres Municipal Code 6.16 and California Health and Safety Code 116800-116820). If you would like to view a list of certified testers, download our Certified Tester List (PDF).