On rare occasions, water pressure is interrupted—perhaps by a water main break, a power failure, firefighters battling a nearby blaze, or some other disruption in water service. When there is a significant loss of pressure, water can flow back into the public water supply system. When water flows backward into the public water supply, it is called “backflow”. In order to prevent this situation from occurring, Davie County has a State Mandated Cross Connection Prevention Program, which requires users of the public water system to install backflow prevention devices to protect the public drinking water distribution system. Most residential homes without in ground irrigation systems will not have or will not have a need for a testable backflow prevention device.