Cross Connection Program
The Cross Connection Control Program has been established to help protect and preserve the quality of our drinking water.  A backflow device restricts a contaminant to come into contact with our drinking water supply. If a pipe breaks and a suction is created and you have a sprinkler head in standing water/liquid, without a backflow device (an unprotected cross connection) it would suck that water/liquid up and dump it into our drinking water. As you can see this could create a huge problem.

Please be careful how you use your garden hose. A garden hose unintentionally, yet frequently, is used as an unprotected cross connection. Some examples: filling a wading pool, a bucket of cleaning solution, a fish pond, or a tank of weed killer by putting the hose inside the container (in the solution) while filling. Always provide an "air gap".

Why Does Monmouth Have A Cross Connection Control Program?

The Safe Drinking Water Act of 1974 mandates that suppliers of drinking water provide and maintain clean, safe drinking water. The State of Oregon enforces this mandate through specific regulations directed at public water systems. Oregon Administrative Rules (333-61-070) state: "Water suppliers shall undertake programs for controlling and eliminating cross connections." It is the City of Monmouth’s responsibility to operate your drinking water system within these established guidelines.

The City of Monmouth is enlisting your help in protecting and preserving the quality of our drinking water by asking you to comply with Monmouth’s Cross Connection Control Program. This program incorporates the following principles. It identifies actual or potential cross connections between the drinking water supply, and any pipe or vessel that may contain a contaminant or pollutant which could backflow into our drinking water system. Once identified, the City eliminates or controls these cross connections. Backflow contamination is controlled by installing a backflow prevention assembly at or near any cross connection that can not be eliminated. Backflow prevention assemblies are mechanical devices which require maintenance, and routine testing by a Certified Backflow Assembly Tester to ensure they function properly. A database that ensures these backflow prevention assemblies are routinely tested for proper operation is maintained by the City’s Cross Connection Control Specialist.

Our drinking water is put at risk through uncontrolled cross connections. Contaminants and other objectionable substances, which could be harmful to health, can enter the City’s water supply through cross connections during a backflow event. Backflow occurs when water flows opposite of its intended direction. There are two conditions that can cause backflow; backsiphonage and backpressure. Backsiphonage can occur when the City’s water main loses pressure. An example; the City’s water main is accidentally broken, and must be shut down for repairs. This reduced water pressure can cause siphoning of contaminants or pollutants back into the drinking water system. Backpressure occurs when water pressure in a building’s plumbing system becomes greater than the water pressure in the City’s water system. This condition can force contaminants or pollutants back into the drinking water system. An approved, properly installed and maintained backflow prevention assembly essentially eliminates the threat of backflow from either backsiphonage or backpressure.

Your help in voluntarily identifying and controlling potential cross connections on private property helps the City achieve our goal of providing you with safe, clean drinking water today and into the future.

Common Cross Connections Requiring A Backflow Assembly

  •     All fire sprinkler systems
  •     Landscape sprinkler systems
  •     Hospitals and Medical Clinics
  •     Industrial facilities
  •     Swimming pools, Spas, and Hot tubs
  •     Solar water heating systems
  •     Photo processing equipment
  •     Antifreeze flush kits
  •     Insecticide sprayers
  •     Fertilizer injection equipment
  •     Commercial Car Washes
  •     Dry Cleaners
  •     Beverage machines using Carbon Dioxide
  •     Livestock watering tanks
  •     Boiler units
  •     Cooling Systems
  •     Landscape water features
  •     Ornamental fountains
  •     Utility sinks with threaded faucets
  •     Properties having water wells


Air Gap - A physical separation between the free-flowing discharge end of a water supply line and an open receiving vessel.

Backflow - The flow of water or other liquids, gases or solids from any source back into the distribution piping of the public potable water supply system.

Backflow Prevention Assembly - An approved, testable device installed on a potable water supply line designed to protect against the backflow, backpressure, or backsiphonage of any substance into the public water supply system.

Backpressure - Water pressure which exceeds the operating pressure of the public potable water supply.

Backsiphonage - Backflow due to a negative or reduced pressure within the public potable water supply.

Certified Backflow Assembly Tester - A person who is certified by the State of Oregon to test backflow prevention assemblies.

Cross Connection - A point in the plumbing system where the public potable water supply is connected directly, or has the potential of being connected, to a source of non-potable substance that is not a part of the public potable water supply.

Cross Connection Control Specialist - A person who is certified by the State of Oregon to administer a cross connection control program and to conduct cross connection surveys.

Contaminant (High hazard) - Any physical, chemical, biological, or radiological substance in water that creates a health hazard.

Pollutant (Low Hazard) - A substance that creates an impairment of the quality of the water to a degree which does not create a hazard to the public health, but which does adversely affect the aesthetic qualities of the water.