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Backflow Testing Program

The District’s Backflow Testing Program was established to track the installation and testing of service protection backflow assemblies within the District’s service area.  It is designed to ensure high quality and reliable potable water services for all of our customers required to have a backflow device per Title 17 Code of Regulations DIVISION 1. STATE DEPARTMENT OF HEALTH SERVICES CHAPTER 5. SANITATION (ENVIRONMENTAL) GROUP 4. DRINKING WATER SUPPLIES ARTICLE 1. GENERAL.

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The cost associated with the program is included in monthly bills for customers with approved assemblies.   The program is voluntary, so if you want to test your device on your own please let us know. A copy of the Backflow Assembly Test Report to be filled out by a certified tester is provided here as well as a list of Certified Backflow Testers.

Backflow Assembly Test FormCertified Backflow Testers

The monthly fee does not cover backflow repair or replacement costs.  Should your device require significant repair or replacement the customer will be responsible for those costs. 

To see rates related to the backflow testing please see the rate sheet below. Under 'Other Charges' on the second page. 

2022 Rate Sheet.pdf

If you are unfamiliar with these type of devices and would like to learn more about their benefit, use/function, and requirements, etc. go to the American Backflow Prevention Association website or American Water Works Association.

For any backflow-related questions or concerns please contact our Backflow Specialist at (760) 728-1178 extension 212. You can also email

Examples where protective devices are required:

  • Residences with an additional water supply (such as a well or the canal)
  • Swimming pools or irrigation systems supplied by a separate water service or without a satisfactory air gap or anti-siphon device on the inlet line
  • Buildings with internal booster pumps systems
  • Buildings three stories or more
  • Premises where there are hazardous materials under pressure or where toxic materials are used (hospitals, mortuaries, etc.)
  • Fertilizer or Chemical Injection Systems