Schedule an Inspection

For inspection requests, answers to specific cross connection control questions and lists of approved assemblies please contact Whitworth Water District at 509.466.7511 or by email at

For a list of approved testers please refer to Whitworth Water District’s list by clicking here, or you can use the City of Spokane’s list by clicking here.

What is the Backflow Testing Program?

Whitworth Water District’s Backflow Testing program protects our water system from potential sources of contamination. Cross connections are any physical link between the public water system and a source of non-potable liquid. Contamination can also result from connections to solid or gas sources that might backflow into the clean water system.

Where can I find the Backflow Preventer Inspection and Field Test Report?

The link for the backflow preventer inspection and field test report can be found be clicking here.

What is Backflow Prevention?

Backflow results when pressure at the location water is being delivered is higher than the pressure delivering water to the same point. This can be caused by high velocities in pipes from maintenance, line breaks or fire fighting. Sources of back-pressure include booster pumps, boilers, elevated piping, and interconnections with auxiliary systems.

Backflow preventers are mechanical assemblies that help stop cross contamination of the clean water system.

Backflow Prevention Devices

  • Air gaps (AG)
  • Reduced Pressure Backflow Assemblies (RPBA)
  • Double Check Valve Assemblies (DCVA)
  • Double Check Detector Assemblies (DCDA)
  • Pressure Vacuum Breaker Assemblies (PVB)
  • Spill Resistant Backflow Assemblies (SVB)
  • Atmospheric Vacuum Breakers (AVB)

The required type of assembly is determined by the assessed hazard:

  • High Hazards: Air Gaps and Reduced Pressure Backflow Assemblies
  • Low Hazards: Double Check Valve Assemblies, Spill Resistant Vacuum Breakers, Pressure Vacuum Breaker Assemblies or Atmospheric Vacuum Breakers