The City of Escondido Utilities Department requires annual testing of backflow prevention devices.  Tracking of Escondido Water customers that have backflow devices, and the required testing of those devices, is performed by the department’s Water Distribution staff.  If you have a question related to your backflow prevention device and/or testing of that device, please contact Dennis Mueller, Cross Connection Technician, at 760-839-4348 or dmueller@escondido.org .