Cross Connection Program

703-631-5101 TTY 711
12055 Government Center Pkwy
Fairfax, VA 22035
Bill Hicks

Cross Connection Control and Backflow Prevention Program

Backflow Prevention AssemblyA cross connection is a link between the water supply and a potential source of contamination. Backflow occurs when the water direction in a plumbing system flows backwards creating the potential for a contaminate to enter our public water system. Backflow prevention can be achieved through the use of backflow assemblies, devices or methods.


Backflow Prevention Assembly in cage protectionFairfax County’s Land Development Services and Fairfax Water work together to safeguard the water supply through implementation and monitoring of the Cross Connections Control and Backflow Prevention Program to identify hazards and ensure testing is conducted as required. Backflow prevention assemblies are required by the building code to be tested annually by a certified tester.



Contact Us

For questions regarding the Cross Connections and Backflow Prevention Program, please contact Land Development Services, Building Division, at 703-222-0801, TTY 711, or by email.

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