Riverside Public Utilities
COVID-19/Coronavirus Update
  Pay Your Bill |   Subscribe |   Outages |   Help? |


Construction standards, building permits and more.

Backflow Prevention

Backflow is the reversal of water's normal direction of flow. When water passes through a water meter into a customer's home or business it should not flow back into the City's water main. If it does, the condition is referred to as "backflow." Backflow prevention guards against the unintentional reversal of water flow.

Riverside Public Utilities is responsible for ensuring that the City of Riverside's water system remains free of contamination from backflow through cross-connections and has an established cross-connection control program. The program has assisted in protecting the City’s water system since 1968 when it was developed.

The California Department of Public Health requires that all public water suppliers implement and enforce a comprehensive cross-connection control program. As part of the program RPU must:

  1. Conduct hazard assessments of new and existing water services to determine if backflow protection is necessary.
  2. Assure that each backflow device installed is tested for proper operation at least annually.
  3. Maintain records of locations, tests, and repairs of all backflow prevention devices.

Details on this program are outlined in the Utility's Water Rule 13.

For additional information about this program contact:

Riverside Public Utilities – Water Operations
Cross Connection Control
2911 Adams Street
Riverside, CA 92504
(951) 351-6386 or (951) 351-6282

Backflow Prevention Resources

For Customers

Approved Backflow Prevention Testers – Only approved, certified backflow prevention testers in Riverside County may test equipment in Riverside and submit reports to RPU. Click Here to view list.

Please note: It is ultimately the responsibility of the customer to follow up with their contracted tester and to assure that test reports have been submitted by their respective due dates.

Backflow Prevention Security – Keep your backflow prevention assemblies secure from vandals and thieves. Click here for tips.

For Contractors

Specifications – Backflow prevention assemblies must conform to the following drawings and specifications.


Approved Backflow Prevention Assemblies: - Backflow assemblies must be approved by the University of Southern California’s Foundation for Cross Connection Control and Hydraulic Research (USCFCCHR) and be on their list of approved backflow prevention assemblies. All makes, models, and sizes are listed.

There are six different types of approved backflow prevention assemblies as listed:

  • Double Check Valve Assemblies (DC)
  • Double Check Detector Assemblies (DCDA) For Fire Protection
  • Reduced Pressure Principle Assemblies (RP)
  • Reduced Pressure Principle Detector Assemblies (RPDA For Fire Protection
  • Pressure Vacuum Breaker Assemblies (PVB)
  • Spill Resistant Vacuum Breaker (SVB)

Be sure to verify which type of assembly has been specified by Riverside Public Utilities for your project.

For Backflow Prevention Testers

Submit Test and Maintenance Reports by e-mail here.

Please note: E-mailed reporting is preferred by RPU staff as it provides both parties with confirmation of receipt of report and timely processing that can help avoid unnecessary fees for your clients.

Generic Test & Maintenance Report - Generic reports will only be accepted in the case of a service call out or the installation of a new device where no record of pending work has been generated.