The City of Escondido Utilities Department requires the annual testing of all backflow prevention devices in accordance with the Federal Safe Drinking Water Act, State of California Title 17. The testing, maintenance, installation, and/or repairs of these private backflow prevention devices is the responsibility of the customer and all results are to be communicated to the City of Escondido Cross Connection Control Department. If you have a question related to your backflow prevention device and/or testing of that device, please contact our office at 760-839-4348 or


What is a backflow prevention device?

A backflow prevention device is designed to prevent water from reverse flowing. This prevents contaminants and pollutants from entering the potable water distribution system.

When is a backflow prevention device required?

Commercial, industrial, agricultural, and multi-family properties. Properties with fire sprinkler systems, wells, booster pumps, and auxiliary water supplies.

Why are backflow prevention devices required to be tested annually?

Mechanical backflow prevention devices have internal seals, springs and moving parts that are subject to fouling, wear or fatigue. Also, mechanical backflow prevention devices can be bypassed illegally. Therefore, all backflow prevention devices need to be tested annually to ensure they are functioning properly.

What is backflow?

The flow of water (or other liquids, mixtures or substances) under pressure into the city system from any source or sources other than its intended source.

What is a cross-connection?

Any physical connection, or arrangement of piping or fixtures, between two otherwise separate piping systems, one of which contains potable water and the other of which contains non-potable water or industrial fluids or questionable safety, through which, or because of which, backflow or back-siphonage may occur into the city system.

A metered water service connection between the city system and a customer system which is cross-connected to a contaminated fixture, industrial fluid system or which a potentially contaminated supply or auxiliary water system, constitutes one type of cross-connection. Other types of cross-connections include connectors such as swing connections, removable sections, four-way plug valves, spools, dummy sections of pipe, swivel or change-over devices, sliding multiport tube, solid connections, etc..

What is backsiphonage?

Back-siphonage. The flow of water (or other liquids, mixtures or substances) into the city system from any source other than its intended source, caused by the sudden reduction of pressure in the city system.


Click here to view backflow device diagram.

Click here to view Certified Testers List


Backflow device