Water Treatment Facility

Cross Connections


Commercial Properties Only : Backflow Device Inspection

Commercial properties are still required to install and test backflow prevention devices.


Customer Information

Frequently Asked Questions

Cross Connections Control Program

Standard Details



Cross connections between water supplies and sources of contamination represent one of the most significant threats to public health in the water supply industry. A cross connection is a physical connection between the drinking water system and any other piping system containing a non-potable substance. A backflow can occur when a substance flows back into the public water system as water pressure fluctuates.  This could be as a result of a water main break or hydrant usage.

The Portland Water District has made important updates to its Cross Connection Control Program.  Effective January 1, 2019, the updated Program Cross extends the requirement of backflow device installation to the following. 

  • New residential construction
  • Substantial renovations of buildings and internal plumbing systems
  • Fire sprinkler systems that are being upgraded