A cross-connection is any actual or potential connection between the public drinking water system and pollutants and/or contaminants, such as chemicals, bacteria, pesticides, or waste water.
Examples of common residential cross-connections are:
- Garden hoses submerged in non-potable sources or polluted/contaminated water (bucket of soapy water, hot tub, swimming pool, animal water trough)
- Lawn irrigation system
Examples of common commercial cross-connections are:
- Carbonator for soda machine
- Lawn irrigation systems
- Chemical dispensers
- Pressure washers
Backflow occurs when water flow is reversed from its intended direction and is pushed or siphoned back into the public drinking water system.
Whenever a water utility connects a customer to its water distribution system, the intention is for the water to flow from the distribution system to the customer. However, it is possible for the flow to be reversed and flow from the customer’s plumbing system back into the public water distribution system if there is pressure loss in the system due to fire fighting activities or other situations. If harmful substances exist within the user’s plumbing system when backflow occurs, then it is possible to contaminate the public water system.
Most multi-family, as well as all commercial and industrial properties and irrigation meters, are required to have a backflow prevention assembly. Single-family residences with irrigation are also required to have backflow assemblies.
Only a licensed plumber/irrigator may install or replace a backflow prevention assembly. Once installed, the assemblies must be tested by a licensed backflow tester. Visit the Backflow Testing web page for more information or call Environmental Services at 972-237-8055.
View list of licensed cross-connection control assembly testers registered with the City of Grand prairie.
All backflow testers must register annually with Environmental Services in order to test cross-connection backflow prevention devices in the City of Grand Prairie. Visit our Backflow Testing web page for registration requirements.