Backflow Testing Changes January 2027

The annual testing requirement is not changing. Backflow prevention assemblies must continue to be tested at least once each year to confirm that they are operating properly and protecting both your property and the public water system. SJW’s current program documents require annual testing by a properly certified tester. 

What This Means for You

You do not need to take any action in response to this advance notice.
Before your backflow test is due in 2027, San Jose Water will provide additional information, including:

• Identification of the assembly or assemblies requiring testing
• Your testing deadline
• Instructions for completing the test
• Requirements for submitting the completed test report to San Jose Water

Once you receive this information, you will be responsible for arranging and paying for the required testing by the stated deadline.

What San Jose Water Will Continue to Do
San Jose Water will continue to administer and oversee the Cross-Connection Control Program, including:

• Identifying properties that require backflow protection
• Determining the appropriate type of protection
• Notifying customers when testing or corrective action is required
• Reviewing submitted test reports
• Maintaining compliance records
• Conducting hazard assessments and inspections
• Following up when required testing or repairs are not completed

Under SJW’s proposed operating model, routine customer-owned assembly testing shifts to certified third-party testers while SJW retains responsibility for program administration, compliance oversight, hazard assessments, records, and enforcement. 

Why Backflow Prevention Matters

Backflow occurs when water flows in the opposite direction from its intended path. This could allow water from a property’s plumbing, equipment, irrigation system, or another source to enter the public drinking water system.

Backflow prevention assemblies help protect both your property and the public water system. Because the mechanical components within an assembly can wear or fail over time, regular testing is necessary to confirm that the assembly continues to operate properly.

We understand that this is a change from the service San Jose Water has historically provided, and we are sharing this information in advance so customers have time to prepare. More detailed instructions will be provided before your 2027 testing deadline.