Cross-connection Control and Backflow Information

The City of Westminster’s Cross-connection Control and Backflow Prevention Program protects the public water supply from pollutants and contaminants that could, under certain circumstances, be drawn into the public water supply from private properties. 

All commercial, industrial, domestic, irrigation and fire line services are required to have an approved backflow prevention assembly installed. Requirements for multi- and single-family residences are assessed based on site hazards. All customers with an auxiliary water supply, such as a well or a pond, are also required to install and maintain backflow prevention assemblies. 

The Colorado Department of Public Health and Environment regulates drinking water quality and standards. The Colorado Primary Drinking Water Regulations (Regulation 11) outline the City’s requirements for cross-connection control and backflow prevention. 

In addition to installing an assembly, water customers must have the assembly tested upon installation and annually thereafter by a certified backflow prevention assembly tester. All testing must be reported to the City of Westminster’s Cross-connection Control team.


You can submit your results here


Contact us at: 


Phone: 303-658-2477


More resources on backflow prevention and cross-connection control: