Keeping accurate records is an essential part of a successful backflow prevention program. This paper describes a successful data management system whose objectives are to: keep backflow incidents from happening by knowing that the proper backflow prevention assemblies are in place where they need to be and that the assemblies are functioning correctly; better resource allocation; and, provide summary documentation for state agency compliance purposes. Besides maintaining records for existing backflow prevention assemblies in active service, a thorough backflow prevention data management program will maintain records for the following: existing backflow prevention assemblies in inactive service locations, e.g. vacant buildings; locations where a backflow prevention assembly is required but not yet installed; due to a survey or other inspection of the site; due to new service requirements; due to retrofit or replacement requirements; locations where it has been determined that a backflow prevention assembly is not required; and, locations where a backflow prevention assembly has been removed due to a change in type of service. Other topics covered by a good data management program include: cross connection site management; facility management; certified tester list; resource/lookup tables; assembly models; data entry controls, automatic calculations and formatting; event management; events to document; test result entry; merge letter management; searching and sorting; maintaining digital images; and, reporting/export capabilities. Includes figures.