Metro Water District

Backflow Prevention

Metropolitan Domestic Water Improvement District is dedicated to providing the water needs of our customers through service, reliability, quality, and value. An important part of a water quality program is a backflow prevention program.

Backflow is the unwanted reversal of flow in a water system. The passages through which backflow may occur are called cross-connections. A cross-connection is an actual or potential connection between a potable water supply and any non-potable source or substance. If backflow is not prevented, the potential exists to allow contaminants into the potable water system, risking public health and pollution.

Metro Water District has a backflow prevention control program as required by state code. The backflow prevention control program requires any site in the system with a backflow assembly to be tested at least once a year by a certified backflow tester to certify that the backflow assembly is working properly.

Metro Water District Backflow Prevention Control Program (5/11/15)
Metro Water District Resolution 2015-1, Adoption of Backflow Prevention Control Program

Backflow Testers

If you are a District customer and are responsible for having the backflow assembly tested, here is a list of certified testers: Certified Backflow Testers List

Backflow Tester Portal

Metro Water District uses an online portal for reporting backflow tests. Follow the link above to access the site and enter your backflow test information. If you have any questions, contact Larry Tanner at 520-575-8100.



Metro Water increased its storage capacity of 4.5 million gallons in 1992 to over 16.5 million gallons in 2008. More storage increases overall reliability... More>

  • © Metropolitan Domestic Water Improvement District
  • 6265 N. La Cañada, Tucson, Arizona 85704
  • 520-575-8100 (office)
  • 520-575-8454 (fax)

Office hours: Monday – Thursday 7:30am - 5:30pm and Friday 7:30am - 12 noon