NAC446.425. Systems for potable and nonpotable water.

     1. There may be no cross connection between the supply of potable water and any water which is nonpotable or may be nonpotable nor any source of pollution by which the potable water might become contaminated.

     2. A system of nonpotable water which meets the limitations established by the State for levels of bacteria may only be used for purposes such as air-conditioning, cleaning, flushing toilets and fire protection and only if the system is approved by the health authority and does not come into direct or indirect contact with food, potable water or equipment that comes in contact with food or utensils. The piping of any nonpotable water must be clearly and permanently identified so that it is readily distinguishable from piping that carries potable water.

     3. The system for potable water must be installed to preclude the possibility of backflow. Devices must be installed to protect against backflow and back siphonage on all fixtures and equipment which do not have an air gap which is at least twice the diameter of the inlet for the water between the inlet and the fixture’s flood level rim. A hose may not be attached to a faucet unless a device to prevent backflow is installed.

     4. A device designed to prevent backflow or back siphonage that is installed on a water supply system must comply with the standards for construction, installation, maintenance, inspection and testing of the Uniform Plumbing Code for that specific application and type of device, as those standards existed on May 23, 1996. The State Board of Health hereby adopts those standards by reference. A copy of the standards may be obtained from the International Association of Plumbing and Mechanical Officials, 20001 Walnut Drive South, Walnut, California 91789-2825, at a price of $45.45.

     5. The use of lead solder on lines carrying potable water is prohibited.

     [Bd. of Health, Food Establishments Reg. Art. 8 §§ 8.2-8.4, eff. 9-17-82]—(NAC A 10-14-88; 5-23-96; 1-30-98)