Cross Connection Control / Backflow

Cross Connection Control and Backflow Brochure

What is Backflow?

 Backflow is the undesirable reversal of flow in a potable water distribution system. Water that is always under pressure can only flow in one direction. Then how can water flow in reverse? Water will always flow towards the point of lowest pressure. If a water main were to break or if the fire department opened several fire hydrants to help fight a fire, the pressure in the water main could drop. The demand upstream could cause a reversal in Cross connections and the possibility of backflow need to be recognized so they do not occur. A garden hose submerged in a hot tub, swimming pool, car radiator or attached to an insect/fertilizer sprayer could siphon the liquid back into the water main. Backflow prevention devices are designed to protect the public water system from these types of concerns. 

Annual Test of Backflow Prevention Devices

Because backflow prevention devices can degrade over time the device must be tested annually to ensure it is in working order. If you recently received a letter from the city stating a device has not been tested in the last year and are unsure of the status of our records you may search our records at If you find any information you would like updated, please contact us at 817-748-8638.

Annual Testing Requirements

If you have received a letter from the City of Southlake that a backflow prevention device is due for testing please click here for a list of registered testers. You may contact any tester not on this list to have the backflow prevention device tested as long as the tester registers with the city before testing the device.

*Ensure your facility is in compliance. Find the record of and the status of all the devices located at your facility.Click here to search for all City of Southlake records of backflow prevention devices.

Becoming a Registered Tester

Click Here to Learn How to Become a Registered Tester

Upon submission and approval of the registration with VEPO, Inc., the tester will be added to the approved Cross Connection Tester List which is furnished to all establishments requiring testing of their backflow devices.

Backflow prevention assemblies on fire protection sprinkler systems are required by the State Fire Marshal to be tested and repaired by a full-time employee of a fire protection sprinkler company that is registered with the State Fire Marshal's Office.

What is a Cross Connection?

A cross connection is a connection between the potable drinking water supply and a possible source of contamination or pollution. Under the provisions of the Safe Drinking Water Act of 1971, the Environmental Protection Agency (EPA) established national standards for safe drinking water. Each state is required to enforce the various regulations of the Safe Drinking Water Act and how it relates to its state laws.

To meet these new provisions, the Texas Commission on Environmental Quality (TCEQ) on January 1, 1996, enacted a new state law which requires the public water suppliers to implement and enforce the Cross Connection Control Program requirements located in the Texas Administrative Code (TAC), Title 30, Chapter 290 of the Rules and Regulations for Public Water Suppliers.

On September 18, 2007, the City of Southlake adopted a new Title VI, Chapter 19 Cross Connection Control and Prevention Ordinance. The Public Works Department began conducting water use system surveys (inspections) as required by this ordinance. These surveys assist in determining if any connections or uses of the potable water supply are inadvertently creating a health hazard to the public.

The City of Southlake has chosen to partner with VEPO, LLC as administrator of the Cross Connection Program. If you have any questions or would like more information about the City of Southlake’s Cross Connection Control and Prevention Program, please contact the city at 817-748-8638.