Cross-Connection Control Program
Tenino Municipal Code, CHAPTER 12.10. - CROSS CONNECTIONS | Code of Ordinances | Tenino, WA | Municode Library, requires that the city develop and implement a comprehensive cross connection control program for the elimination of all existing and potential cross connections as well as the prevention of future cross connections.
Tenino Public Works delivers safe, high-quality drinking water every day. Our Cross Connection Control (CCC) Program is designed to safeguard public health and continue to keep the water system free of contaminants and pollutants.
Inspections are performed on all commercial, industrial and residential buildings connected to the water supply in order to detect actual and potential cross connections and to make recommendations for the installation of backflow prevention methods or devices, wherever necessary. This action ensures that contaminated water cannot backflow into our clean, drinking water supply.
Inspections are recommended on varying frequencies based on the hazard level of a given facility. The current frequency recommendation is as follows:
- Commercial (High Hazard) & Industrial 2 to 3 Year cycle
- (Low Hazard) 6 to 8 Year cycle
- Residential 15 to 20 Year cycle
What Is a Cross-Connection Control Program?
A cross-connection control program is a cooperative effort between a municipality, health officials, plumbing contractors, and property owners. The purpose is to establish and administer guidelines for the control of potential cross connections and ensure their enforcement so that the public drinking water supply is protected both in the city water mains and within buildings to the point of use.
- Cross Connection Control Surveys – All commercial, industrial, and residential plumbing systems should be inspected to determine if any cross connections exist.
- Installation of Protective Devices – Backflow prevention devices or assemblies will be installed by the owner where unprotected cross connections are found to exist
- Annual Testing of Testable Backflow Devices – Customers must have all testable backflow prevention assemblies tested once a year by a certified tester. This is the responsibility of the property owner and results will be reported to the City of Tenino.
- Public Education Materials – Our water customers will be provided access to additional public education and awareness on our website. Higher hazard customers will receive letters.
What Is a Cross-Connection?
A cross connection is an actual or potential connection between the public water supply system and a source of contamination or pollution. The most common cross connection is a garden hose, which is easily connected to the public water supply system and can be used to apply a variety of potentially dangerous substances including chemicals and fertilizer. Other common cross connections include boilers, pressure washers, toilets, pools, and lawn irrigation systems.
How Does Contamination Occur?
Water normally flows in one direction, from the public water system through a customer’s cold or hot water plumbing system, to a faucet or other plumbing fixture. Under certain conditions, water can flow in the reverse direction. This is known as backflow which may occur when either back-siphonage or backpressure is created in a water line. Back-siphonage creates a vacuum which may pull or siphon contaminants backwards into the drinking water supply while backpressure may force contaminant-laced water back into the building’s piping system.
Back-siphonage may occur when there is a drop in the supply pressure of the water distribution system. This can be caused by a water line break, water main repair, or during a rapid withdrawal of water from a fire hydrant (i.e. flushing or firefighting). Backpressure may be created when a source of pressure, such as a pump, a steam or hot water boiler, or elevated storage tank creates a pressure greater than that supplied from the water distribution system.
How Is Contamination Prevented?
Identifying cross connections is the first step in preventing potential water contamination. An effective CCC program involves implementation of methods or devices that prevent the backflow of potentially compromised water into the building’s plumbing system once a hazard has been identified. An air gap is the most effective barrier. A variety of mechanical barriers including the hose connection vacuum breaker, reduced pressure zone backflow preventer, double check valve assembly or atmospheric vacuum breaker can also be installed to prevent backflow.
What is a Cross-Connection Survey?
For commercial and industrial facilities, a survey is a systematic walk-through of the water-system piping in a building or property, starting at the water meter and ending at the last free-flowing tap. An inspector accompanied by a building representative, documents all actual or potential cross connections and notes any method, device or assembly employed to prevent backflow.
Common cross connection hazards encountered during a survey may include any of the following:
- Heating and cooling systems – boiler, chiller, cooling tower
- Medical, laboratory or industrial equipment connected to the water supply
- Water treatment devices – water softener, reverse osmosis unit
- Hose sprayer, power washer, utility sink, hose connection
- Carbonated beverage machine, steamer, proofer
- Fire sprinkler or lawn irrigation system
- Shampoo bowl or pedicure chair
- Chemical mix system
Survey times vary depending on the facility being inspected. A small facility with few connections to the water supply may require thirty minutes or less while a larger, more complex facility may require multiple visits to inspect the facility and document all cross connections and any violations identified.
At the conclusion of the survey, the inspector will describe any violations that were identified and the corrections that must be made. A written notice of the violations and a time frame for compliance is mailed to the owner, or their agent, typically within 5-7 business days. This report will indicate what steps must be taken. It may require the owner to purchase, install or test backflow prevention devices.
A common violation observed during the cross-connection survey is the failure to complete or submit the results of the annual performance test for testable assemblies (double check assembly, reduced pressure principal backflow preventer, pressure vacuum breaker). Repeated failure to perform or report the annual performance test may result in suspension of water service.
Follow the links below for additional information on cross connection control:
- Cross Connection Control Manual – US EPA
- 50 Questions, Answers, and Illustrations – Watts