Bonner Springs City Codes require that all Backflow Devices be inspected annually by a State of Kansas certified Backflow Technician. The Backflow Devices are installed to ensure the safety of our drinking water and are installed in most businesses that handle any food processing and on fire sprinkler waterlines. The Water Division for the Utility Department is responsible for ensuring that these devices are inspected annually. State and City regulations require that all fire lines and backflow devices must be tested annually. Backflow Device Inspection Reports are due by: July 1.