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In order to insure the proper operation of a backflow assembly, it must be tested and certified upon installation and periodically thereafter as required by state code. If the hazard (substance you are protecting against) is considered a high hazard (e.g., a hazard that can cause health problems), the City requires that the device be tested annually.
If the hazard is considered a low hazard (e.g., the hazard effects only the taste and odor of the water), the City requires testing every 3 years. The Texas Commission on Environmental Quality oversees the state requirements. For more information please call 512-393-8010.