(a) “Auxiliary water supply” means any water supply on or available to the premises other than the purveyor's approved public potable water supply. These auxiliary waters may include water from another well, or “used waters” or “industrial fluids.” These waters may be polluted or contaminated or they may be objectionable and constitute an unacceptable water source which does not have sanitary control.
(b) “Backflow” means the flow of water or other liquids, mixtures or substances under pressure into the distributing pipes of a potable water supply system from any source or sources other than its intended source.
(c) “Back-siphonage” means the flow of water or other liquids, mixtures or substances into the distributing pipes of a potable water supply system from any source, other than its intended source, caused by the sudden reduction of pressure in the potable water supply system.
(d) “Backflow prevention device” means a device or means designed to prevent backflow or back-siphonage.
(e) “Contamination” means an impairment of the quality of the potable water by sewage, industrial fluids or waste liquids, compounds, or other materials to a degree which creates an actual hazard to public health through poisoning or through the spread of disease.
(f) “Cross-connection” means any physical connection or arrangement of piping or fixtures between two otherwise separate piping systems, one of which contains potable water and the other nonpotable water or industrial fluids of questionable safety, through which, or because of which, backflow or back-siphonage may occur into the potable water system.
(g) Cross-Connection --Controlled. “Controlled cross-connection” means a connection between a potable water system and a nonpotable water system with an approved backflow prevention device, properly installed, that will continuously afford protection commensurate with the degree of hazard.
(h) “Cross-connection control by containment” means the installation of an approved backflow prevention device at the water service connection to any user's premises where it is physically and economically infeasible to find and permanently eliminate or control all actual or potential cross-connections within the user's water system: or, the installation of an approved backflow prevention device on the service line leading to and supplying a portion of a user's water system where there are actual or potential cross-connections which cannot be effectively eliminated or controlled at the point of cross-connection.
(i) “Industrial fluids system” means any system containing a fluid or solution which may be chemically, biologically or otherwise contaminated or polluted in a form or concentration such as would constitute a health, system, pollution or plumbing hazard if introduced into an approved water supply. This may include, but is not limited to, the following: polluted or contaminated waters; all types of process waters and “used waters” originating from the public potable water system, which may have deteriorated in sanitary quality; chemicals in fluid from; plating acids and alkalies, circulated cooling waters connected to an open cooling tower and/or cooling towers, which are chemically or biologically treated or stabilized with toxic substances; contaminated natural waters from wells, irrigation canals or systems, etc.; oils, gases, glycerine, paraffins, caustic and acid solutions and other liquid and gaseous fluids such as those used for industrial or fire-fighting purposes.
(j) “Pollution” means the presence of any foreign substance (organic, inorganic, or biological) in water which tends to degrade its quality, so as to constitute a hazard or impair the usefulness or quality of the water to a degree which does not create an actual hazard to the public health, but which does adversely and unreasonably affect such waters for domestic use.
(k) Water --Potable. “Potable water” means any water which, according to recognized standards, is safe for human consumption.
(l) Water --Nonpotable. “Nonpotable water” means water which is not safe for human consumption or which is of questionable potability.
(m) Water --Service Connection. “Water service connection” means the terminal end of a service connection from the public potable water system; i.e., where the city loses jurisdiction and sanitary control over the water at its point of delivery to the user's water system. If a meter is installed at the end of the service connection, then the service connection shall mean the downstream end of the meter. There should be no unprotected takeoffs from the service line ahead of any meter or backflow prevention device located at the point of delivery to the user's water system. Service connection shall also include water service connection from a fire hydrant and all other temporary or emergency water service connections from the public potable water system.
(n) Water --Used. “Used water” means any water supplied by the city from a public potable water system to a user's water system after it has passed through the point of delivery and is no longer under the sanitary control of the city.
(o) Water System. “Water system” consists of two parts, the city system and the user system.
(1) The “city system” consists of the source facilities and the distribution system, including storage and delivery systems under the complete control of the city, up to the point where the user's system begins.
(2) The “user system” consists of all facilities beyond the termination of the city system which are utilized in conveying city delivered domestic water to points of use. (Ord. No. 1113, § 4 (part).)