(a) "Approved backflow prevention assembly"
means a device to counteract backpressures or prevent backsiphonage. This assembly must appear on the list of approved assemblies issued by the Washington State Board of Health.
(b) "Auxiliary supply"
means any water source or system, other than the public water system, that may be available in the building or on the premises.
(c) "Backflow"
means the flow in the direction opposite to the normal flow or the introduction of any foreign liquids, gases, or substances into the water system of the city of Fircrest water service area.
(d) "Backpressure"
means a pressure (caused by a pump, elevated tank or piping, boiler, or other means) on the consumer's side of the service connection that is greater than the pressure provided by the city's water system and which may cause backflow.
(e) "Backsiphonage"
means backflow due to a reduction in system pressure in the city's distribution system.
(f) "Cross-connection"
means any actual or potential physical arrangement where the city's water system is connected, directly or indirectly, with any other nondrinkable water system or auxiliary system, sewer, drain conduit, hot tub, swimming pool, storage reservoir, plumbing fixture, swamp coolers, radiator flush kit, garden hose (aspirator) or any other device which contains, or may contain, contaminated water, sewage, or other liquid of unknown or unsafe quality which may be capable of imparting contamination to the public water system as a result of backflow. Bypass arrangements, jumper connections, removable sections, swivel or changeover devices, or other temporary or permanent devices through which, or because of which, backflow may occur are considered to be cross-connections.
(g) "Premises"
means any piece of land to which water is provided by the city of Fircrest water system, including all structures, improvements, and other facilities located on it.
(h) "Public water system"
means any system excluding a system serving one single-family residence, providing piped water for human consumption, and also referred to as "potable water."
(i) "Purveyor"
means any agency or subdivision of the state or any municipal corporation, firm, company, mutual or cooperative association, institution, partnership or person or any other entity that owns or operates a public water system. It also means three or more authorized agents of any such entities.
(j) "Reduced pressure principle assembly"
means an assembly containing two independently acting approved check valves together with a hydraulically operated, mechanically independent pressure differential relief valve located between the check valves and at the same time below the first check valve. The assembly shall include properly located test cocks and tightly closing shut-off valves at the end of the assembly. A check valve is approved if it appears on the list of approved assemblies issued by the Washington State Board of Health.
(Ord. 1439 § 2, 2007)