The City of Boulder welcomes your feedback. Use our Inquire Boulder customer service tool to tell us what’s on your mind.

  • Boulder Water
  • Your Utility Bill
  • Flood Safety
  • Utilities Projects
  • Water Education
  • Wastewater
  • Utilities Division Boards
  • Water Distribution Info Center

Backflow Prevention Program

Installation and annual testing of backflow prevention assemblies is a state requirement to help protect water quality and public health.

State regulations require the City of Boulder to maintain a Backflow Prevention Program to track the installation and annual testing of backflow prevention assemblies on all hazardous cross-connections (potential points for contamination and backflow). This applies to all commercial/industrial, large multifamily and some smaller multifamily and residential customers connected to the city's water supply. Properly working backflow prevention assemblies keep drinking water clean and safe.


Email Backflow Prevention or call 303-413-7401.