Cross-Connection Control and Backflow Prevention Program

Denver Water’s Backflow Prevention Assembly Test and Maintenance Report is the only accepted test report format.

In adherence to Colorado's regulations and Denver Water's Operating Rules, the Cross-Connection Control and Backflow Prevention Program protects the public water system from cross-connection contamination by requiring customers to:

  • Install containment assemblies (also known as backflow prevention assemblies, containment  devices or backflow prevention devices) on the following water service lines:
    • Commercial property water service lines
    • Dedicated irrigation lines
    • Fire lines
    • Multi-Family Residential Units (depending on the degree of hazard; please refer to PDF document Chapter 5.05 of Denver Water's Engineering Standards)
    • Single-Family Residential Units with a Dual Water Supply Agreement
  • Test containment assemblies after initial installation and annually thereafter to make sure they are functioning properly.
  • Submit completed test reports to Denver Water's Cross-Connection Control Office.

Affected customers are notified by postal mail of required assembly installation and testing. It is the customer's responsibility to hire a qualified professional to install a backflow prevention assembly. Upon installation the customer is required to test the backflow prevention assembly by hiring a certified ABPA (American Backflow Prevention Association) or ASSE tester (American Society of Sanitary Engineering) within 48-hours of installation and send the test report(s) to Cross-Connection Control. The backflow prevention assembly is required to be tested annually thereafter.

"Passed" test reports must be sent to Denver Water's Cross-Connection Control Office within 3 days of testing.

"Failed" tests must be verbally reported to the Cross-Connection Control Office by the end of the business day. The written reports must be sent within 3 days. Failed containment assemblies must be repaired or replaced and then retested within 5 days and submitted to the Cross-Connection Control office. Depending on the degree of hazard Denver Water may require repairs/replacement be done immediately to prevent contamination.

It is at the sole discretion of Denver Water's Cross-Connection Control section to suspend water service if the premises poses a health risk to the public water supply. 

Test reports may be emailed (preferred) or faxed to the Cross-Connection Control Office:

Mailing Address: Attn: Cross-Connection Control
6100 W. Quincy Ave.
Denver, CO 80235

For further assistance please contact our Cross-Connection Control Office at 303-628-5969.