City of Flagstaff Water Services: backflow testing rules
Serves Flagstaff, AZ. 5 points from City of Flagstaff Water Services's own pages, read October 7, 2026, each linked to the page it came from.
City of Flagstaff Water Services at a glance
- When the test is due
- Homes and businesses with a contamination risk must install backflow assemblies and test them every year. Single family homes used only as residences are exempt from the assembly requirement. Source.
- How the report is filed
- Testers submit backflow reports through BSI Online, by phone at 888-966-6050 or through an account on its website. Source.
- Approved testers
- City of Flagstaff Water Services keeps its tester register in an online lookup on flagstaff.az.gov, linked and not copied. Open the lookup.
Who must test
- After any repair or maintenance, a certified tester must retest the assembly right away and submit the results. Source.
Notices and deadlines
- The Cross Connection Control Program sends a courtesy notice when an assembly's annual test is due. Source.
Approved testers
- Customers can get a list of certified testers by calling BSI Online at 888-966-6050, or look up testing companies online with their customer confirmation number. Source.
Program
- Flagstaff Water Services runs a Cross Connection Control Program to keep backflow out of the distribution system. Source.
From notice to filed report, the steps are the same everywhere: how a backflow test goes.
Other water utilities in Arizona
- City of Phoenix Water Services
- Tucson Water
- City of Mesa Water Resources
- City of Chandler Water Quality
- City of Scottsdale Water Resources
- City of Glendale Water Services
- City of Avondale Water Resources
- EPCOR Water Arizona
Read October 7, 2026. Program page: flagstaff.az.gov.