Cross Connection Program

An active program involves:

• Regular inspections to identify actual or potential cross connections

• Elimination of cross connections when possible

• Installation of appropriate backflow prevention assemblies when elimination isn't feasible

• Annual testing of backflow assemblies by a Certified Backflow Assembly Tester

Cross Connection Control Inspectors assist water users in identifying potential hazards and recommending solutions, including the appropriate prevention devices required by the state.

The City of Philomath, like other water districts, actively monitors for cross connections and oversees the proper installation of backflow prevention assemblies. While our goal is to provide you with safe, dependable drinking water, we can’t do it alone—we rely on your help to prevent contamination and protect the system.

Please note:
Installation of a backflow prevention device for an irrigation system requires a plumbing permit. Apply through the Building Department.

It seems logical to assume that water always flows in one direction because it's under pressure—but yes, water can flow backwards, and when it does, the consequences can be serious. Water naturally moves toward the point of lowest pressure.

If a water main breaks or firefighters open multiple hydrants, the pressure in the system can drop rapidly, reversing the flow. This can cause contaminants or pollutants to be siphoned back into the public water supply—which is exactly why this is a concern for the Philomath Public Works Department.

For example, if residential plumbing is connected to the potable water supply and also to another fluid or gas source—like:

• an air conditioner with algae-killing chemicals,

• a garden hose submerged in a hot tub or swimming pool,

• a hose inserted into a car radiator for flushing antifreeze, or

• a hose attached to a fertilizer sprayer—

these connections can draw harmful substances back into the water system. Unfortunately, incidents like these have occurred across the country and far too often.

Here are some examples of fixtures that may create a risk to the drinking water supply:

• Agricultural mixing tanks

• Auxiliary water supplies (wells)

• Dialysis equipment

• Dishwashers

• Garden hoses

• Fire protection systems

• Lawn irrigation systems

• Photographic developers

• Sinks

• Solar energy systems

• Swimming pools

• Toilet flush valves

• Watering troughs

• Water softeners

If any of these pose a risk, the cross connection must be eliminated or properly protected.