§ 78-293. Definitions.

The following words, terms and phrases, when used in this article, shall have the meanings ascribed to them in this section, except where the context clearly indicates a different meaning:

Auxiliary water supply means any water supply on or available to the premises other than the city's approved public water supply. These auxiliary waters may include water from another purveyor's public potable water supply or any natural source, such as a well, spring, river, stream, harbor and so forth; used waters; or industrial fluids.

Backflow means the undesirable reversal of flow in a potable water distribution system as a result of a cross connection.

Backflow prevention assembly means an assembly or means designed to prevent backflow. The approved types are as follows:

(1)

Air gap means the unobstructed vertical distance through the free atmosphere between the lowest opening from any pipe or faucet conveying water or waste to a tank, plumbing fixture, receptor or other assembly and the flood level rim of the receptacle. These vertical physical separations must be at least twice the diameter of the water supply outlet, and never less than one inch (25 millimeters).

(2)

Reduced-pressure principle backflow prevention assembly. The approved reduced-pressure principle backflow prevention assembly consists of two independently acting approved check valves together with a hydraulically operating, mechanically independent pressure differential relief valve located between the check valves and below the first check valve. These units are located between two tightly closing resilient-seated shutoff valves as an assembly and equipped with properly located resilient-seated test cocks.

(3)

Double check valve assembly. The approved double check valve assembly consists of two internally spring loaded check valves, installed as a unit between two tightly closing resilient-seated shutoff valves and fittings with properly located resilient-seated test cocks.

Contaminant means any foreign substance that degrades the quality of the potable water supply or creates a health hazard.

Cross connection means a connection between any part of a potable water system and any other fluids containing other substances in a manner that, under any circumstances, would allow such substances to enter the potable water system. Other substances may include gases, liquids or solids, such as chemicals, waste products, steam, water from other sources (potable or nonpotable), or any matter that may change the color or add odor to the water.

Director means the director of the water services department.

Industrial fluids means any fluids or solution that may be chemically, biologically or otherwise contaminated or polluted in a form or concentration that would constitute a health, system, pollution or plumbing hazard if introduced into an approved water supply. This may include but shall not be limited to polluted or contaminated waters; all types of process waters and used waters originating from the public potable water system that may have deteriorated in sanitary quality; chemicals in fluid form; plating acids and alkalis; circulating cooling waters connected to an open cooling tower; or cooling towers that are chemically or biologically treated or stabilized with toxic substances; contaminated natural waters, such as wells, springs, streams, rivers, bays, harbors, seas, irrigation canals or systems, etc.; oils, gases, glycerin, paraffins, caustic and acid solutions; and other liquid and gaseous fluids used in industrial or other purposes, including for firefighting purposes.

Pollutant means any foreign substance in water that tends to degrade its quality so as to constitute a nonhealth hazard or impair the usefulness of the water.

Water, nonpotable means water that is not safe for human consumption or that is of questionable quality.

Water, potable means water that is safe for human consumption as described by the Safe Drinking Water Act (42 USC 300.f et seq.).

(Ord. No. 120551, § 1, 6-28-12)

Cross reference

Definitions and rules of construction generally, § 1-10.