Residential and Non-Residential Customers

  1. Annual Testing Requirements
  2. Opt-In Testing Program
  3. Outdoor Hoses
  4. Backflow Prevention Diagrams
  5. Winterizing Your Home

Annual Testing Requirements


After an approved backflow prevention (BFP) assembly has been installed and tested, it must be re-tested annually by individuals who have been certified by an approved testing school. The CCC office establishes the annual testing schedule and mails notification to the homeowner or business. The city also maintains a list of qualified testers (PDF) who are approved to conduct testing of assemblies on the City of Durham's water distribution system.

The owner of the backflow prevention assembly has 15 days to repair or replace the failed assembly if the BFP fails the requirements of the annual test. The 15 day requirement to repair a failed unit is subject to change only upon contact with the City’s Cross Connection Control office to determine replacement/repair due date. Contact the Cross Connection Control office at 919-560-4194 prior to any repair or replacement. In addition, a backflow permit must be submitted with all replacement or new backflow prevention assemblies. Also, a fire permit and/or a plumbing permit may be required (see FAQs).