Cross Connection Control
Water Quality is a matter of mutual concern and benefit. With this in mind we recognized the need to develop and implement a comprehensive Cross Connection Control Program in order to protect the quality of the water in our distribution system.
There is a full time Cross Connection Control Coordinator to develop, implement and maintain a program which focuses an all Industrial, Commercial, Institutional, and Agricultural water customers in our water utility.
The Cross Connection Control Coordinator checks connections (industrial, commercial, institutional and agricultural) to determine whether pipes, vessels or other devices exist that would allow fluid contaminants to enter the water system by backflow.
Our Plumbing Inspectors ensure that adequate protective equipment is installed in new or renovated buildings. Potentially hazardous cross connections are eliminated or backflow prevention assemblies (testable) or devices (non-testable) are installed. All installations are subject to yearly testing and inspection programs administered by the Cross Connection Control Coordinator. Check out this list of certified testers.
Backflow Prevention Monitoring Software is used to track all testable assemblies in the City. All pertinent data including; serial number, ownership, location, maintenance history, and hazard are entered on the BPMS database.
Currently, there are 726 facilities participating in the program. 1526 backflow prevention assemblies are in service and being tracked.
1,200 facilities in Kelowna have backflow preventers installed. As part if the annual testing requirement, the KJWC backflow preventer registry is currently tracking 2,500 backflow preventers. There is recorded data from 10,050 backflow preventers since 1998.
A cross connection is a direct arrangement of a piping line which allows the potable water supply to be connected to a line which contains a contaminant. An example is the common garden hose attached to a hose bib with the end of the hose lying in a cesspool. Other examples are a garden hose attached to a service sink with the end of the hose submerged in a tub full of detergent, supply lines connected to bottom-fed tanks and supply lines to boilers.
This is a combined cooperative effort between plumbing and health officials, water purveyors, property owners and certified testers to establish and administer guidelines for controlling cross connections and implementing means to ensure their enforcement so that the public potable water supply will be protected both in the city main and within buildings. The elements of a program define the type of protection required and responsibility for the administration and enforcement.
Ironically, the ordinary garden hose is the most common offender as it can be easily connected to the potable water supply and used for a variety of potentially dangerous applications.
Outdoors: The most common example in a home environment is a garden hose attached to an outside tap or hose bib with the end of the hose connected to a pesticide sprayer or left submerged in an ornamental pool; underground lawn watering (irrigation) systems.
Indoor Fixtures: Laundry sink c/w hose, handheld shower heads immersed in water, alternative heating systems and auxiliary water sources.
Other: Boilers, fire protection systems and in-home water treatment (softeners) systems, high pressure washer, etc.
System without an air gap System with an air gap
Air Gap is the physical separation of the potable and non-potable system by an air space. The vertical distance between the supply pipe an the flood level rim should be two times the diameter of the supply pipe but never less than 1”. The air gap can be used on a direct or inlet connection and for all toxic substances.
Yes, essentially all cross connection control devices cause some degree of pressure loss. The typical pressure drop across a device depends on the type, make, size and location of the device. Refer to the manufacturers literature.
Back-siphonage is the reversal of normal flow in a system caused by negative pressure (vacuum or partial vacuum) in the supply piping.
Back-siphonge can be created when there is stoppage of the water supply due to nearby fire-fighting, repairs or breaks in city mains, etc. The effect is similar to the sipping of an ice cream soda by inhaling through a straw, which induces a flow in the opposite direction.
Backpressure is the reversal of normal flow in a system due to an increase in the downstream pressure above that of the supply pressure.
Backpressure-backflow is created when the downstream pressure exceeds the supply pressure which is possible in installations such as heating systems, elevated tanks and pressure-producing systems. An example would be a hot water space heating boiler operating under 15-20 lbs. pressure coincidental with a reduction of the city water supply below such pressure (or higher in most commercial boilers). As water tends to flow in the direction of least resistance, a backpressure-backflow condition would be created and the contaminated boiler water would flow into the potable water supply.
Pollution of the water supply does not constitute an actual health hazard, although the quality of the water is impaired with respect to taste, odour or utility. Contamination of the water supply, however, does constitute an actual health hazard; the consumer being subjected to potentially lethal water borne disease or illness.
Atmospheric Vacuum Breakers – which also includes hose connection vacuum breakers
Pressure Vacuum Breakers – which also includes a backflow preventer with intermediate atmospheric vent for ½" and ¾" lines
Double Check Valve Assembly
Reduced Pressure Zone Backflow Preventers
Contract a Certified Tester (i.e. journeyman plumber, mechanical contractor) to install the cross connection control on the identified water supplies.
Cross connection control devices have internal seals, springs and moving parts that are subject to fouling, wear or fatigue. Therefore, all cross connection control devices have to be tested periodically to ensure that they are functioning properly.
Contract a Certified Tester (i.e. journeyman plumber, mechanical contractor) to install test and submit the test report(s) to the water purveyor and you should also receive a copy of the report.
Generally, it is the owner of the property or agent of the owner (i.e. property manager) or as identified in the lease agreement. If the cross connection control device belongs to the tenant then the tenant should be responsible.
Yes, however each request must be presented in writing to the Cross Connection Control Officer and will be individually assessed due to the factors involved (i.e. degree of hazard, type of protection etc.).