For the purpose of this chapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
AIR GAP SEPARATION. The physical vertical separation between the free-flowing discharge end of a potable water supply pipeline and the open or non-pressure receiving vessel.
AWWA. The American Water Works Association.
BACKFLOW or BACK SIPHONAGE. The flow of water or other fluid or substance or mixture thereof into the domestic water supply system from any source other than the intended source of water supply.
BACKFLOW PREVENTION DEVICE or BACKFLOW PREVENTION DEVICE ASSEMBLY. A backflow prevention device such as a pressure vacuum breaker, a double check valve, or a reduced pressure principle device, and the attached shut-off valves on the inlet and outlet ends of the device assembled as a completed unit.
CHECK VALVE. A valve which allows flow in only one direction.
CROSS-CONNECTION. Any actual or potential connection, link, or channel between a domestic water supply system and a pipe or piping system used or intended to be used for some other purpose or between a domestic water supply system and a plumbing fixture, appliance, receptacle, vessel, or other service, or a source other than the intended source of water supply whereby it may be possible for contaminated water or water of questionable or unsafe quality, or fluid substance other than potable water, to enter any part of the domestic water supply system.
DOUBLE CHECK VALVE ASSEMBLY. An assembly of two independently acting check valves with shut-off valves on each side of the check valves and test cocks for checking the watertightness of each check valve.
PUBLIC HEALTH HAZARD. A condition whereby there are sufficient types and amounts of biological, chemical, or physical, including radiological, agents relating to water or sewage which are likely to cause human illness, disorders, or disability. These include, but are not limited to pathogenic viruses, bacteria, parasites, toxic chemicals, and radioactive isotopes.
PURVEYOR. Entity supplying water.
REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTION DEVICE (R.P. DEVICE). A device for preventing backflow which has two check valves, a differential relief valve located between the two check valves, two shut-off valves, one on the upstream side and the other on the downstream side of the check valves, and four test cocks for checking the water tightness of the check valves and the operation of the relief valve.
SAFE DRINKING WATER. Water which has sufficiently low concentrations of microbiological, inorganic chemical, organic chemical, radiological, or physical substances so that individuals drinking such water at normal levels of consumption will not be exposed to disease organisms or other substances which may produce harmful physiological effects.
(Ord. 346, passed 4-13-1992)