LAC 51:XXIII.3105. Backflow [formerly paragraph 22:22-3]

A. Backflow shall be prevented by: 1. installing an air gap in the water distribution system between the water supply inlet and the flood level rim of the plumbing fixture, equipment, or nonfood equipment which is at least twice the diameter of the water supply inlet (or generally, three times the diameter if affected by a nearby wall); or 2. installing an approved backflow or backsiphonage prevention device installed and maintained on a water line in accordance with Part XIV of the state sanitary code; 3. not having a direct connection between the drainage system and any drain line originating from food handling equipment (e.g., any sink where food is cleaned, peeled, cut up, rinsed, battered, defrosted, or otherwise prepared or handled; potato peelers; ice cream dipper wells; refrigerators; freezers; walk-in coolers and freezers; ice boxes; ice making machines, fountain type drink dispensers; rinse sinks, cooling or refrigeration coils; laundry washers; extractors; steam tables; egg boilers; coffee urns; or similar equipment). EXCEPTION: A commercial dishwashing (warewashing) machine may have a direct connection between its waste outlet and a floor drain when the machine is located within 5 feet (1.5m) of a trapped floor drain and the machine outlet is connected to the inlet side of a properly vented floor drain trap.