Backflow Prevention

A Consumer's Guide to Backflow Prevention in Texas

The Texas Commission of Environmental Quality requires all public water systems to maintain a cross-connection control program that protects the distribution system delivering drinking water to your home or business.

City of Tomball's cross-connection control program includes:

  • An inspection of the customer's private plumbing to identify and prevent cross-connections and potential contamination, including contamination from high lead levels in the plumbing.
  • Installation and testing of backflow- prevention assemblies, where required.
  • Rules to prevent cross-connections and unacceptable plumbing practices- ordinances, regulations, service agreements, and a plumbing code.

Third Party CSI Inspectors:

Ray Harlow: 832-349-4465  Terry Blanchard: 281-889-1443  Taylor: 936-647-5852

Some Public Water systems may have more stringent requirements that the TCEQ. TCEQ regulations are the minimum requirement.

How can backflow be prevented?

Backflow into a potable-water system can be prevented by using a backflow-prevention assembly, or an air gap, which is a physical separation between the water supply and a potential source of pollution. Licensed professionals as well as your public water system are responsible for determining the type of backflow- prevention assembly required, based on the degree of hazard.

Testing backflow- prevention assemblies

Because backflow-prevention assemblies are mechanical assemblies that can fail, the TCEQ requires testing of all backflow-prevention assemblies at installation by a TCEQ-licensed tester. Backflow-prevention assemblies installed to protect against any health hazard must be tested annually.

City of Tomball Backflow Prevention Assembly Test and Maintenance Worksheet:

How can I find out more information about backflow?

For more information about backflow and cross-connection control, visit or

Questions about the City of Tomball's Backflow and Cross Connection Program please contact:

Will Goff

Utilities Superintendent