The following definitions apply only to this chapter. For the purpose of this chapter, these definitions supersede definitions given elsewhere in this Code of Ordinances.
1. “Administrative authority” means Des Moines Water Works and the City of Windsor Heights.
2. “Approved backflow prevention assembly for containment” means a backflow prevention assembly which is listed by the University of Southern California Foundation for Cross Connection Control and Hydraulic Research as having met the requirements of ANSI-AWWA Standard C510-97, Double Check Valve Backflow Prevention Assemblies, of ANSI-AWWA Standard C511-97, Reduced Pressure Principle Backflow Prevention Assemblies, for containment. The listing shall include the limitations of use based on the degree of hazard. The backflow prevention assembly must also be listed by the International Association of Plumbing and Mechanical Officials.
3. “Approved backflow prevention assembly for containment in a fire protection system” means a backflow prevention assembly to be used in a fire protection system which meets the requirements of Factory Mutual Research Corporation (FM) and Underwriters Laboratory (UL), and the requirements of the Fire Code and the Building Code of Windsor Heights, in addition to the requirements of Section 91.07 of this chapter. Devices sized smaller than 2½ inches which have not been listed by Underwriters Laboratory (UL) and tested by Factory Mutual Research Corporation (FM) may be allowed if they meet the requirements of the Fire Code and the Building Code.
4. “Auxiliary water supply” means any water supply on or available to the premises other than City of Windsor Heights or its designee’s approved public water supply, such as (but not limited to) a private well, pond, or river.
5. “Containment” means a method of backflow prevention which requires the installation of a backflow prevention assembly at the water service entrance.
6. “Cross connection” means any actual or potential connection or arrangement, physical or otherwise, between a potable water supply system and any plumbing fixture or tank, receptacle, equipment, or device, through which it may be possible for non-potable, used, unclean, polluted, and contaminated water or other substance to enter into any part of such potable water system under any condition.
7. “Customer” means the owner, operator, or occupant of a building or property which has a water service from a public water system, or the owner or operator of a private water system which has a water service from a public water system.
8. “Degree of hazard” means the rating given by the administrative authority of a cross connection or water service which indicates its potential to cause contamination or pollution of the public water supply.
9. “Double check valve backflow prevention assembly” means a backflow prevention device consisting of two independently acting internally loaded check valves, four properly located test cocks, and two isolation valves.
10. “High hazard cross connection” means a cross connection which may cause an impairment of the quality of the public potable water supply by creating an actual hazard to public health, through poisoning or through the spread of disease by sewage, industrial fluids, or waste.
11. “Isolation” means a method of backflow prevention in which a backflow prevention assembly is located at the cross connection rather than at the water service entrance.
12. “Low hazard cross connection” means a cross connection which may cause an impairment of the quality of the public potable water supply to a degree which does not create a hazard to public health, but which does adversely and unreasonably affect the aesthetic qualities of such potable waters for domestic use.
13. “Reduced pressure principle backflow prevention assembly” means a backflow prevention device consisting of two independently acting internally loaded check valves, a pressure relief valve, four properly located test cocks, and two isolation valves.
14. “Registered backflow prevention assembly technician” means a person who is registered by the State of Iowa to test and repair backflow prevention assemblies and report on the condition of those assemblies.
15. “Thermal expansion” means volumetric increase of water due to heating resulting in increased pressure in a closed system.
16. “Water service” means, depending on the context, the physical connection between a public water system and a customer’s building, property, or private water system, or the act of providing potable water to a customer.
17. “Public water supplier,” for the purpose of this section, means the entity providing public water for human consumption through pipes or other constructed conveyances to at least 15 service connections or serving an average of at least 25 people for at least 60 days a year.