For the purpose of this chapter, the following definitions shall apply unless the context clearly indicates, or requires, a different meaning.
ADMINISTRATOR. The Administrator of the Health Division of the Department of Human Resources, or his or her designee.
APPROVED. Accepted by the city as meeting an applicable specification stated or cited in this regulation, or as suitable for the proposed use.
AUXILIARY WATER SUPPLY. Any water supply on or available to the premises other than the purveyor’s will be considered as an AUXILIARY WATER SUPPLY.
BACK PRESSURE. Any elevation of pressure in the downstream piping system (by pumping, elevation of piping, steam, or air pressure) above the supply pressure at the point of consideration which would cause, or tend to cause, a reversal of the normal direction of flow.
BACKFLOW. The undesirable reversal of flow of water, or mixtures of water and other liquids, gases, or other substances, into the distribution pipes of the potable supply of water from any source or sources.
BACKFLOW PREVENTER. An assembly or means designed to prevent backflow or backsiphonage.
(1) AIR GAP. A physical separation between free flowing discharge end of a potable water supply pipeline and an open or non-pressure receiving vessel. An APPROVED AIR GAP shall be at least double the diameter of the supply pipe measured vertically above the overflow rim of the vessel, and in no case be less than one inch.
(2) ATMOSPHERE VACUUM BREAKER. A device which prevents backsiphonage by creating an atmospheric vent when there is either a negative pressure or sub-atmospheric pressure on a water system.
(3) DOUBLE CHECK VALVE ASSEMBLY. An assembly of two independently operating spring-loaded check valves with tightly closing shut-off valves on each side of the check valves, plus properly located test cocks for the testing of the check valve.
(4) PRESSURE VACUUM BREAKER. A device consisting of one or more spring-loaded check valves and an independently operating air inlet valve installed as a unit between two tightly closing shut-off valves on each side of the check valves and properly located test cocks for testing. The air inlet valve is internally loaded to the open position.
(5) REDUCED PRESSURE PRINCIPLE BACKFLOW PREVENTER. A device consisting of two independently acting, spring-loaded check valves separated by a spring-loaded differential pressure relief valve. This device shall be installed as a unit between two tightly closing shut-off values and properly located test cocks for the testing of the check valves and relief valves.
BACKSIPHONAGE. The flow of water or other liquids, mixtures, or substances into the distribution pipes of a potable water supply system from any source other than its intended source caused by the sudden reduction of the pressure in the potable water supply system.
CONTAMINANT. Any physical, chemical, biological, or radiological substance or matter in water.
CROSS-CONNECTION. Any link or channel between the public water supply and piping or fixtures which carry other water or other substances.
CROSS-CONNECTION CONTROL STAFF. The person(s) designated by the city to administer and enforce the City Water System’s cross-connection control program.
DISTRIBUTION SYSTEM. The network of pipes and other facilities which are used to distribute water from the source, treatment, transmission, or storage facilities to the water user.
DIVISION. The Health Division of the State Department of Human Resources.
OWNER. Any person who has legal title to, or license to operate or habitat in, a property upon which a cross-connection inspection is to be made or upon which a cross-connection is present.
PERMIT. A document issued by the utility which allows the use of a backflow preventer.
PERSON. Any individual, partnership, company, public or private corporation, political subdivision or agency of the State Division, agency or instrumentality of the United States, or any other legal entity.
UTILITY. The city water section of the Public Works Department.
WATER SERVICE ENTRANCE (CONNECTION). The point in the owner’s water system beyond the sanitary control of the utility, generally considered to be the outlet end of the water meter and always before any unprotected branch.
WATER USER. Any customer or person utilizing water from the city water system.
(Prior Code, § 52.02) (Ord. 97-464, passed 3-3-1997; Ord. 476, passed 1-10-2000)