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Village of East Aurora, NY § 263-15. Water backflow. A. The purpose of this chapter is to safeguard potable water supplies from potential contamination by preventing backflow from a water user's system into the public water system. It is the intent of this chapter to recognize that there are varying degrees of hazard and to apply the principal that the degrees of hazard protection should be commensurate with the degrees of hazard. Further, it is the intent of the Village of East Aurora, New York to comply with the requirements of the New York State Sanitary Code, Part 5 Section 5-1-31, which section mandates the requirement that the supplier of water protect their water system in accordance with procedures acceptable to the Commissioner of Health. These mandated requirements are as set forth in the Cross Connection Control Manual published by the New York State Department of Health (NYSDOH) and to that extent the terms, conditions and provisions of the New York State Sanitary Code, Part 5, Section 5-1-31, and the Cross Connection Control Manual are incorporated in this chapter by reference as if more fully stated. B. Definitions. As used in this chapter, the following terms shall have the meanings indicated: AIR GAP SEPARATION — A physical break between a supply pipe and a receiving vessel. The air gap shall be at least double the diameter of the supply pipe, measured vertically above the top rim of the vessel, in no case less than one inch. APPROVED CHECK VALVE — A check valve that seats readily and completely. It must be carefully machined to have free moving parts and assured watertightness. The face of the closure element and valve seat must be bronze composition or other noncorrodible material, which will seat tightly under all prevailing conditions of field use. Pins and bushings shall be of bronze and other noncorrodible, non-sticking material, machined for easy dependable operation. The closure element shall be internally weighted or otherwise internally equipped to promote rapid and positive closure in all sizes where this feature is obtainable. APPROVED DOUBLE CHECK VALVE ASSEMBLY — Two single independently acting check valves, including tightly closing shutoff valves located at each end of the assembly and suitable test connections. This device must be approved as a complete assembly. APPROVED REDUCED PRESSURE PRINCIPAL BACKFLOW PREVENTION DEVICE — A device incorporating two or more check valves and an automatically operating differential relief valve located between the two checks, two shutoff valves, and equipped with necessary appurtenances for testing. The device shall operate to maintain the pressure in the zone between the two check valves, less than the pressure on the public water supply side of the device. At cessation of normal flow, the pressure between the check valves shall be less than the supply pressure. In case of leakage of either valve, the differential relief valve shall operate to maintain this reduced pressure by discharging to the atmosphere. To be approved, these devices must be readily accessible for maintenance and testing and installed in a location where no part of the device will be submerged. APPROVED WATER SUPPLY — Any water supply approved by the New York State Department of Health. AUXILIARY SUPPLY — Any water supply on or available to the premises other than the approved public water supply. Downloaded from https://ecode360.com/EA0398 on 2026-03-04