Cross Connection Program

Fairfax County, Virginia


TTY 711

12055 Government Center Pkwy
Fairfax, VA 22035

Bill Hicks,

Cross Connection Control and Backflow Prevention Program

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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.


Download Test Report

Locate and download your pre-filled Backflow Assembly Test Report.

Submit Test Reports

Please review the requirements and responsibilities prior to submitting your test report.

Update Contact

It is your responsibility to inform the county of a change in ownership or responsible party.

Contact Us

For questions regarding the Cross Connections and Backflow Prevention Program, please contact Land Development Services, Building Division, at 703-631-5101, TTY 711, or by email.

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