Backflow Prevention

If you have a backflow prevention assembly, you must ensure that it is in proper operating condition at all times, and that it is tested and certified annually by a certified backflow prevention assembly tester approved by Helix Water District.

What is Backflow?

Backflow is the reversal flow of water, liquids, mixtures or substances from a customer’s property into Helix’s water distribution system. This can happen when there is a reversal in water pressure and a cross connection, a connection between the public water supply and a source of contamination, such as a garden hose in a swimming pool or an irrigation, fire sprinkler, graywater or rainwater harvesting system.  Two conditions can cause a reversal in water pressure:

A sudden reduction in Helix’s water pressure due to a water main break or vehicle running into a fire hydrant can create suction that draws potential contaminants into Helix’s water distribution system.

When a customer’s water pressure exceeds Helix’s water pressure, contaminants can flow into Helix’s water distribution system. A well pump or boiler can cause backpressure.

Your Backflow Assembly

Backflow prevention assemblies must be tested on an annual basis to comply with the State of California.

Annual Testing

Who this applies to

  • Residential properties with fire sprinkler systems
  • Some residential properties who have a well, pond or graywater or rainwater system
  • Multi-family properties
  • Commercial and industrial customers



Backflow prevention assemblies must be tested on an annual basis to comply with the State of California Code of Regulations, Title 17, and Helix Water District Policies and Procedures, Section 5.3.

Reminder Notice

We will send an annual reminder notice to customers who are required to have a backflow assembly. The notice will be sent to a customer 30 days prior to the testing due date.

Report Forms

Customers will receive with their annual reminder notice a pre-filled Field Testing and Maintenance Report form for each backflow prevention assembly they have. Provide this pre-filled form to the tester for completion.

Testers: please email to request a pre-filled test form.

Blank Test Form – Current

Approved Testers

Note that backflow prevention assembly testers must be industry certified and approved by Helix Water District before testing within our service area. Approved testers are held to the highest standards of ethics and professionalism and Helix maintains the right to remove testers at its own discretion pursuant to Helix Water District Policies and Procedures, Section 5.3-3(D).

Approved Backflow Tester List (Jan 4 2021 Update) 

How to Become an Approved Tester
To apply for approval, please submit a formal request and include your business and contact information, a copy of an ABPA, AWWA or ASSE certificate, and copies of your gauge calibration reports. Approval is contingent upon maintaining current copies of these items with Helix. Submit all items to:

Darrin Teisher
Cross Connection Control Coordinator
Office Hours: Monday-Friday, 7:30am-3:30pm
P  619.667.6224
F  619.599.8058


Cross Connection Control
Office Hours: Monday-Friday, 7:30am-3:30pm
P 619.667.6224
F 619.599.8058

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