Backflow Prevention Program

The City of Granbury's Water Department takes pride in the water we provide and continues to protect the potable water that meets or exceeds all TCEQ and EPA standards.  Our Cross-Connection Control and Backflow Prevention Program is committed to helping protect your drinking water system from potential contamination.

About Backflow

Backflow is the undesirable reversal of the flow of water in a potable water distribution system as a result of a cross connection.  In other words, backflow is water flow going in the wrong direction.  There are two types of backflow:

  • Backpressure - This occurs when water generated pressure from a private service exceeds the water pressure provided by the City's water system.  Causes for increased pressure from a private system may include a pump, elevated tank, boiler, or other condition.
  • Backsiphonage - This occurs when backflow is caused by negative or reduced pressure in the supply piping.


All Backflow Prevention assemblies require a Plumbing or Irrigation Permit prior to installation from the City of Granbury Permits Department located at Granbury City Hall at 116 W. Bridge St. Granbury, TX  76048 (817) 573-1114.

Irrigation Permit Application  

Plumbing Permit Application


On June 22, 2018 the City of Granbury partnered with Backflow Solutions, Inc., or BSI Online.  BSI Online will take full control and access over our backflow program, effective July 15, 2018. BSI has worked diligently to become the nation's leader in municipal backflow data management and comprehensive cross-connection control solutions.  The City of Granbury will require online submission of Backflow Prevention Assembly Tests and Maintenance Reports into the BSI Online Tracking system.  Testers will no longer be able to submit paper test reports directly to the City:

  • Effective July 15, 2018 all annual test reports must be submitted to BSI Online.
  • July 15, 2018 - August 14, 2018 you can enter test reports online with no filing fee. 

  • After August 15, 2018 - the filing fee of $12.95 per test report submitted is applied.

Backflow Prevention Resources