A. 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.

B. Certified backflow assembly tester means a person who has successfully completed and maintains all requirements as established by the Department of Human Services – Health Services to be a tester in the State of Oregon.

C. Contamination means the entry into or presence in a public water supply system of any substance which may be deleterious to health and/or quality of the water.

D. Cross connection means any physical arrangement where a potable water supply is connected, directly or indirectly, with any other nondrinkable water system or auxiliary system, sewer, drain conduit, swimming pool, storage reservoir, plumbing fixture, swamp coolers 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.

E. Degree of hazard means the non-health hazard or health hazard or high hazard classification that shall be assigned to all actual or potential cross connections.

F. Double check detector assembly or DCDA means an assembly which consists of two independently operating check valves which are spring-loaded or weighted. The assembly comes complete with a shut-off valve on each side of the checks, as well as test cocks to test the checks for tightness. It shall also be provided with a factory bypass arrangement with a meter and a minimum of an approved double check assembly.

G. Health hazard means an actual or potential threat of contamination of a physical, chemical or biological nature to the public potable water system or the consumer’s potable water system that would be a danger to health.

H. Mobile units means units that are temporary in nature, connecting to the water system through a legally permitted hydrant, hose bib, or other appurtenance of a permanent nature that is part of the City’s water system or a permanent water service to a premises. Examples can include but are not limited to the following: water trucks, pesticide applicator vehicles, chemical mixing units or tanks, waste hauler’s trucks or units, sewer cleaning equipment, carpet or steam cleaning equipment other than homeowner use, rock quarry or asphalt/concrete batch plants or any other mobile equipment or vessel that poses a threat of backflow in the City Water System. Uses that are excluded from this definition are recreational vehicles at assigned sites or parked in accordance with other City policies pertaining to recreational vehicles and homeowner devices that are used by the property owner in accordance with other provisions of these, or other, City policies pertaining to provision of water service to a premises.

I. Non-health hazard means the classification assigned to an actual or potential cross connection that could allow a substance that may be objectionable, but not hazardous to one’s health, to backflow into the potable water supply.

J. Pollution hazard means an actual or potential threat to the physical properties of the water system or the potability of the public or the consumer’s potable water system, but which would not constitute a health or system hazard, as defined. The maximum intensity of pollution to which the potable water system could be degraded under this definition would cause minor damage to the system or its appurtenances.

K. Reduced pressure principle backflow prevention assembly or 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 two tightly closing shut-off valves. [Ord. NS-2182, 2012]