Air gap.A physical separation between the free flowing discharge end of a potable water supply pipe and an opening of a receiving vessel, plumbing fixture or other device. The air gap separation must be at least twice the diameter of the potable water supply pipe but never less than 1 inch.
Atmospheric vacuum breaker (AVB).Consists of a float check, a check seat and an air inlet port. A shutoff valve immediately upstream may be an integral part of the assembly. The AVB is designed to allow air to enter the downstream water line to prevent backsiphonage. This unit may never be subjected to a backpressure condition or have a downstream shutoff valve or be installed where it will be in continuous operation for more than twelve (12) hours.
Auxiliary water supply.Any water source or system that is available to a customer’s site from a source other than directly through the city’s potable water system. These auxiliary water supplies include, but are not limited to:
(1) Water from another public water system;
(2) Water from a natural source, such as a well, spring, pond, river, creek or lake;
Backflow.The undesirable reversal of flow of water and/or the introduction of any foreign liquids, gases, or substances from a customer’s water service connection into the city’s water system.
Backflow prevention assembly.An approved assembly to counteract or prevent backflow. The approved assembly must be listed, approved, manufactured, tested and installed for specific uses in accordance with the standards adopted by the AWWA (Manual M14, latest version) or approved and listed by the University of Southern California Foundation Manual for Cross-Connection Control (latest version) and is otherwise in compliance with this article and the plumbing code.
Backpressure.Any situation or occurrence where the pressure in a customer’s system is higher than in the city’s water system and could cause a reversal of the normal direction of flow.
Backsiphonage.Occurrence where the pressure in the city water system becomes less than that of the customer’s system due to a vacuum in the system causing flow of water to reverse.
Bypass.A connection from the city side of a backflow prevention assembly to the customer side of the assembly for the purpose of diverting water around the assembly while it is being repaired or replaced.
Check valve.A valve that seats readily and completely in order to completely cease the flow of water.
City.The City of Weimar or a designated representative.
City water system.The entire potable water distribution system of the City of Weimar, including, without limitation, all pipes, facilities, valves, pumps, conduits, tanks, receptacles and fixtures and appurtenances between the water supply source and the point of delivery, used by the city to produce, convey, deliver, measure, treat or store potable water for public consumption or use.
Commercial establishment.Property or location which is used primarily for the manufacture, production, storage, wholesaling or retailing of services.
Contamination.Presence of any foreign substance that is not common to the potable water supply, which degrades the quality of the water and creates a health hazard.
Cross connection.Any connection, physical or others, between the potable water system and any plumbing fixture or any tank, receptacle, equipment or device, through which it is possible for any nonpotable, used, unclean, polluted and/or contaminated water, or other substances, to enter into any part of the potable water system under any condition or set of conditions.
Customer service inspection.Inspection of a customer’s system for the purpose of providing or denying water service. This inspection is designed to detect any actual or potential cross connections, potential contaminant hazards and illegal lead materials that may be in exceedance of the lead action level.
Customer’s system.Entire plumbing system, including all pipes, tanks, receptacles, fixtures, equipment and apparatuses used to produce, convey, store or utilize potable or nonpotable water between the point of delivery and the customer’s point of use.
Double check valve assembly (DCVA).An assembly which consists of two independently acting, approved check valves, including tightly closing resilient seated shutoff valves attached at each end of the assembly and fitted with properly located resilient seated test cocks. This assembly shall only be used to protect against a nonhealth hazard.
Hazard contaminant.Any form of contamination that poses a health hazard with respect to the use of water for drinking or other domestic purposes.
Health hazard.Actual or potential contamination or other situation involving any substance that can cause death, illness, spread of disease or has a high probability of causing such effects if introduced into the city’s potable water system.
Nonhealth hazard.Cross connection, potential contamination hazard or other situation involving any substance that generally will not be a health hazard but will constitute a nuisance or be aesthetically objectionable, if introduced into the city’s potable water system.
Point of delivery.The point at which water leaves the city water system and enters a customer’s system at or near the property line or the edge of an easement. When a water meter is installed on or near the property line or edge of an easement, the point of delivery is the terminal end on the discharge side of the water meter.
Pollutant.Contaminant that impairs the quality of water in a manner or to a degree that does not create a hazard to public health but may adversely affect the aesthetic qualities of the water for domestic use.
Potential contamination hazard.A condition which, by its location, piping or configuration, has a reasonable probability of being used incorrectly, through carelessness, ignorance, or negligence, to create or cause to be created a backflow condition by which contamination can be introduced into the water supply.
Pressure vacuum breaker (PVB).An assembly, which provides protection against backsiphonage but does not provide adequate protection against backpressure backflow. The assembly is a combination of a single check valve with an AVB and can be used with downstream resilient seated shutoff valves. In addition, the assembly has suction and discharge gate valve and resilient seated test cocks, which allows for the full testing of the assembly.
Public water system.Public-owned water system, which supplies water for public domestic use. The system includes all services, reservoirs, facilities and any equipment used in the process of producing, treating, storing or conveying water for public consumption.
Reduced pressure backflow assembly (RPBA).Consists of two independently acting 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 are equipped with properly located resilient-seated test cocks.
Service connection.Terminal end of service connection from the city’s potable water system in which city loses jurisdiction and sanitary control over the water at its point of delivery to the customer’s water system. If a meter is installed at the point of delivery, the service connection means the point at which the terminal end on the discharge side of the water meter connects to the customer’s system.
(Ordinance 01-2019 adopted 1/10/19)