Backflow prevention devices are mechanical assemblies that help stop cross contamination of the clean water system. In order to prevent the occurrence of backflow, the PUD, City of Clarkston, Asotin County, and the State of Washington Department of Health regulations require the installation of backflow prevention devices on all non-drinking water systems.

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

Washington State Department of Health regulations require that all backflow assemblies be tested on an annual basis by a certified backflow assembly tester (BAT). 

• Certified Testers List

• Lawn Irrigation Systems Can Pollute or Contaminate drinking water
• Contamination can create Household Hazards
• Cross Connections can create Heath Hazards

For questions or for more information regarding backflow prevention, contact Craig Riehle at operations@asotinpud.org or at 509-758-1010.